1,720,996 research outputs found
A Comparative Study Of The Magnetocaloric Effect In Rni2 (r=nd,gd,tb) Intermetallic Compounds
Full text linkConventional and anisotropic magnetocaloric effects were studied in cubic rare earth RNi2 (R=Nd,Gd,Tb) ferromagnetic intermetallic compounds. These three compounds are representative of small, null, and large magnetocrystalline anisotropy in the series, respectively. Magnetic measurements were performed in polycrystalline samples in order to obtain the isothermal magnetocaloric data, which were confronted with theoretical results based on mean field calculations. For the R=Tb case, we explore the crystalline electrical-field anisotropy to predict the anisotropic magnetocaloric behavior due to the rotation of an applied magnetic field of constant intensity. Our results suggest the possibility of using both conventional and anisotropic magnetic entropy changes to extend the range of temperatures for use in the magnetocaloric effect. © 2009 American Institute of Physics.1051Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 0031-9007 10.1103/PhysRevLett.78.4494Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Appl. Phys. Lett., 70, p. 3299. , 0003-6951 10.1063/1.119206Von Ranke, P.J., De Oliveira, N.A., Mello, C., Garcia, D.C., De Souza, V.A., Carvalho, A.M.G., (2006) Phys. Rev. B, 74, p. 054425. , 0163-1829 10.1103/PhysRevB.74.054425De Oliveira, I.G., Garcia, D.C., Von Ranke, P.J., (2007) J. Appl. Phys., 102, p. 073907. , 0021-8979 10.1063/1.2783781Lima, A.L., Tsokol, A.O., Gschneidner Jr., K.A., Pecharsky, V.K., Lograsso, T.A., Schlagel, D.L., (2005) Phys. Rev. B, 72, p. 024403. , 0163-1829 10.1103/PhysRevB.72.024403Von Ranke, P.J., De Oliveira, N.A., Garcia, D.C., De Souza, V.S.R., De Souza, V.A., Carvalho, A.M.G., Gama, S., Reis, M.S., (2007) Phys. Rev. B, 75, p. 184420. , 0163-1829 10.1103/PhysRevB.75.184420Carvalho, A.M.G., Campoy, J.C.P., Coelho, A.A., Plaza, E.J.R., Gama, S., Von Ranke, P.J., (2005) J. Appl. Phys., 97, p. 083905. , 0021-8979 10.1063/1.1876575Plaza, E.J.R., De Sousa, V.S.R., Alho, B.P., Von Ranke, P.J., (unpublished)Von Ranke, P.J., De Oliveira, N.A., Plaza, E.J.R., De Souza, V.S.R., Alho, B., Carvalho, A.M.G., Gama, S., Reis, M.S., (2008) J. Appl. Phys., 104, p. 093906. , 0021-8979 10.1063/1.3009974Lindbaum, A., Gratz, E., Heathman, S., (2002) Phys. Rev. B, 65, p. 134114. , 0163-1829 10.1103/PhysRevB.65.134114Purwins, H.G., Leson, A., (1990) Adv. Phys., 39, p. 309. , 0001-8732 10.1080/00018739000101511Lea, K.R., Leask, M.J.M., Wolf, W.P., (1962) J. Phys. Chem. Solids, 23, p. 1381. , 0022-3697 10.1016/0022-3697(62)90192-0Stevens, K.W.H., (1952) Proc. Phys. Soc., London, Sect. A, 65, p. 209. , 0370-1298 10.1088/0370-1298/65/3/308Von Ranke, P.J., Pecharsky, V.K., Gschneidner Jr., K.A., (1998) Phys. Rev. B, 58, p. 12110. , 0163-1829 10.1103/PhysRevB.58.12110Von Ranke, P.J., Nóbrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406. , 0163-1829 10.1103/PhysRevB.63.18440
Understanding The Influence Of The First-order Magnetic Phase Transition On The Magnetocaloric Effect: Application To Gd5(sixge 1-x)4
No full textIn this article, we investigate the influence of the first-order ferromagnetic-paramagnetic phase transition, on the magnetocaloric effect, under the combined effect of external magnetic field, pressure and magnetoelastic deformation. An application is made to Gd5(SixGe 1-x)4, for x = 0.43 and 0.5. The obtained result leads to a good theoretical adjustment of the experimental data for isothermal magnetic entropy change. © 2003 Elsevier B.V. All rights reserved.2771-27883Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494Tegus, O., Bruck, E., Buschow, K.H.J., De Boer, F.R., (2002) Nature, 415, p. 150Von Ranke, P.J., Grangeia, D.F., Caldas, A., De Oliveira, N.A., (2003) J. Appl. Phys., 93, p. 4055Von Ranke, P.J., Pecharsky, V.K., Gschneidner Jr., K.A., (1998) Phys. Rev. B, 58, p. 12110Von Ranke, P.J., De Oliveira, I.G., Guimarães, A.P., Da Silva, X.A., (2000) Phys. Rev. B, 61, p. 447Lima, A.L., Oliveira, I.S., Gomes, A.M., Von Ranke, P.J., (2002) Phys. Rev. B, 65, p. 172411Von Ranke, P.J., Lima, A.L., Nóbrega, E.P., Da Silva, X., Guimarães, A.P., Oliveira, I.S., (2001) Phys. Rev. B, 63, p. 24422Von Ranke, P.J., Pecharsky, V.K., Gschneidner, K.A., Korte, B.J., (1998) Phys. Rev. B, 58, p. 14436De Oliveira, N.A., Von Ranke, P.J., Tovar Costa, M.V., Troper, A., (2002) Phys. Rev. B, 66, p. 94402Choe, W., Pecharsky, V.K., Pecharsky, A.O., Gschneidner Jr., K.A., Young Jr., V.G., Miller, G.J., (2000) Phys. Rev. Lett., 84, p. 4617Pecharsky, V.K., Gschneidner Jr., K.A., (1997) J. Alloys Compounds, 260, p. 98Morellon, L., Algarabel, P.A., Ibarra, M.R., Blasco, J., García-Landa, B., Arnold, Z., Albertini, F., (1998) Phys. Rev. B, 58, p. 14721Bean, C.P., Rodbell, D.S., (1961) Phys. Rev., 126, p. 104Müller, K.A., Fauth, F., Fischer, S., Koch, M., Furrer, A., Lacorre, Ph., (1998) Appl. Phys. Lett., 73, p. 1056Von Ranke, P.J., Nobrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406Von Ranke, P.J., De Oliveira, N.A., Caldas, A., (1998) Physica A, 256, p. 397Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Appl. Phys. Lett., 70, p. 329
The Influence Of Magnetic And Electric Coupling Properties On The Magnetocaloric Effect In Quantum Paraelectric Eutio 3
No full textWe report on the magnetic and magnetocaloric effect calculations in antiferromagnetic perovskite-type EuTiO 3. From the isothermal magnetic entropy change calculated upon low magnetic field changes (below 1 T) several results were predicted: inverse magnetocaloric effect, latent heat associated to spin AFM-FM reorientation transition and a temperature interval (controlled by magnetic field) where the EuTiO 3 does not change heat in an isothermic process. The magnetocaloric effect described through magnetic entropy change was correlated with magnetocapacitance formula. The theoretical investigation was carried out using a Heisenberg Hamiltonian considering the G-type antiferromagnetic structure with exchange interactions, in mean field approximation, between nearest-neighbor and next-nearest-neighbor magnetic Eu 2 ions. © 2011 Elsevier B.V. All rights reserved.324712901295Warburg, E., (1881) Annals of Physics, 13, p. 141Debye, Ann.P., (1926) Physik, 81, p. 1154Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Physical Review Letters, 78, p. 4494De Oliveira, N.A., Von Ranke, P.J., (2010) Physics Report, 489, p. 89De Souza, V.S.R., Magnus, A., Carvalho, G., Plaza, E.J.R., Alho, B.P., Tedesco, J.C.G., Coelho, A.A., Von Ranke, P.J., (2011) Journal of Magnetism and Magnetic Materials, 323, p. 794Alho, B.P., De Oliveira, N.A., De Sousa, V.S.R., Plaza, E.J.R., Magnus, A., Carvalho, G., Von Ranke, P.J., (2010) Journal of Physics Condensed Matter, 22, p. 486008Sande, P., Hueso, L.E., Miguens, D.R., Rivas, J., Rivadulla, F., Lopez-Quintela, M.A., (2001) Applied Physics Letters, 79, p. 2040Nobrega, E.P., De Oliveira, N.A., Von Ranke, P.J., Troper, A., (2006) Physical Review B, 74, p. 144429Yamada, H., Goto, T., (2004) Physica B, 346, p. 104Spaldin, N.A., Fiebig, M., (2005) Science, 309, p. 391Fiebig, M., (2005) Journal of Physics D: Applied Physics, 38, pp. R123-R152Katsufuji, T., Takagi, H., (2001) Physical Review B, 64, p. 054415Kolodiazhnyi, T., Fujita, F., Wang, L., Zong, Y., Tanaka, K., Sakka, Y., Takayama-Muromachi, E., (2010) Applied Physics Letters, 96, p. 252901Qing, J., Hua, W., (2002) Chinese Physics, 11, p. 1303Lines, M.E., Glass, A.M., (1977) Principles and Applications of Ferroelectrics and Related Materials, , Oxford ClarendonFennie, C.J., Rabe, K.M., (2006) Physical Review Letters, 96, p. 205505Sushkov, A.B., Tchernyshyov, O., Ratcliff, I.I.W., Cheong, S.W., Drew, H.D., (2005) Physical Review Letters, 94, p. 137202Fennie, C.J., Rabe, K.M., (2006) Physical Review Letters, 97, p. 267602McGuire, T.R., Shafer, M.W., Joenk, R.J., Alperin, H.A., Pickart, S.J., (1966) Journal of Applied Physics, 37, p. 98
The Isothermal Variation Of The Entropy (Δst) May Be Miscalculated From Magnetization Isotherms In Some Cases: Mnas And Gd 5ge2si2 Compounds As Examples
No full textThe determination of the isothermal variation of the entropy (ΔS T) is discussed in the present work. We show that ΔS T has very different profiles and magnitudes when calculated from M vs. H or M vs. T experimental data. For MnAs compound, ΔST obtained from M vs. T data does not present a colossal peak. This result and the agreement between theoretical and experimental non-colossal magnetocaloric effect indicate that the colossal peak may be miscalculated from M vs. H experimental data. For Gd5Ge2Si2 compound, ΔST obtained from M vs. T data does not present the peak observed in ΔST from M vs. H data. © 2011 Elsevier B.V. All rights reserved.509834523456Gama, S., Coelho, A.A., De Campos, A., Carvalho Magnus A, G., Gandra, F.C.G., Von Ranke, P.J., De Oliveira, N.A., (2004) Phys. Rev. Lett., 93, p. 237202De Campos, A., Rocco, D.L., Carvalho Magnus A, G., Caron, L., Coelho, A.A., Gama, S., Da Silva, L.M., De Oliveira, N.A., (2005) Nat. Mater., 5, p. 802Liu, G.J., Sun, J.R., Shen, J., Gao, B., Zhang, H.W., Hu, F.X., Shen, B.G., (2007) Appl. Phys. Lett., 90, p. 032507Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Appl. Phys. Lett., 70 (24), p. 3299Wada, H., Tanabe, Y., (2001) Appl. Phys. Lett., 79 (20), p. 3302Zhang, H.W., Shen, J., Dong, Q.Y., Zhao, T.Y., Li, Y.X., Sun, J.R., Shen, B.G., (2008) J. Magn. Magn. Mater., 320, p. 1879Carvalho Magnus A, G., Von Ranke, P.J., De Oliveira, N.A., Coelho, A.A., Gama, S., Gandra, F.C.G., (2009) Eur. Phys. J. B, 68, p. 67Amaral, J.S., Amaral, V.S., (2009) Appl. Phys. Lett., 94, p. 042506Caron, L., Ou, Z.Q., Nguyen, T.T., Cam Thanh, D.T., Tegus, O., Brück, E., (2009) J. Magn. Magn. Mater., 321, p. 3559Tocado, L., Palacios, E., Burriel, R., (2009) J. Appl. Phys., 105, p. 093918Balli, M., Fruchart, D., Gignoux, D., Zach, R., (2009) Appl. Phys. Lett., 95, p. 072509Das, S., Amaral, J.S., Amaral, V.S., (2010) J. Phys. D: Appl. Phys., 43, p. 152002Cui, W., Liu, W., Zhang, Z., (2010) Appl. Phys. Lett., 96, p. 222509Gigure, A., Foldeaki, M., Gopal, B.R., Chahine, R., Bose, T.K., Frydman, A., Barclay, J.A., (1999) Phys. Rev. Lett., 83 (11), p. 2262Gschneidner Jr., K.A., Pecharsky, V.K., Brück, E., Duijn, H.G.M., Levin, E.M., (2000) Phys. Rev. Lett., 85 (19), p. 4190De Oliveira, N.A., Von Ranke, P.J., (2008) Phys. Rev. B, 77, p. 214439Gama, S., De Campos, A., Coelho, A.A., Alves, C.S., Ren, Y., Garcia, F., Brown, D.E., Von Ranke, P.J., (2009) Adv. Funct. Mater., 19 (6), p. 942Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86 (1), p. 565Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86 (11), p. 6315Tocado, L., Palacios, E., Burriel, R., (2006) J. Therm. Anal. Calor., 84, p. 213Gschneidner Jr., K.A., Pecharsky, V.K., (2000) Annu. Rev. Mater. Sci., 30, p. 387Carvalho Magnus A, G., Alves, C.S., Colucci, C.C., Bolanho, M.A., Coelho, A.A., Gama, S., Nascimento, F.C., Cardoso, L.P., (2007) J. Alloys Compd., 11, p. 432Carvalho Magnus A, G., Coelho, A.A., Gama, S., Von Ranke, P.J., Alves, C.S., (2008) J. Appl. Phys., 104, p. 063915Von Ranke, P.J., Nóbrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406Von Ranke, P.J., Gama, S., Coelho, A.A., De Campos, A., Carvalho Magnus A, G., Gandra, F.C.G., De Oliveira, N.A., (2006) Phys. Rev. B, 73, p. 014415Pecharsky, V.K., Gschneidner Jr., K.A., (1999) J. Appl. Phys., 86, p. 6315Pecharsky, V.K., Gschneidner Jr., K.A., (2005) Magnetism and Structure in Functional Materials, pp. 199-222Casanova, F., Batlle, X., Labarta, A., Marcos, J., Vives, E., Mañosa, L., Planes, A., (2005) Magnetism and Structure in Functional Materials, pp. 223-23
Investigation On The Magnetocaloric Effect In (gd,pr)al2 Solid Solutions
No full textA theoretical and experimental investigation on the magnetocaloric properties of the rare earth pseudo-binary compounds Gd1-nPr nAl2 is presented. The calculated isothermal entropy and adiabatic temperature changes under magnetic field variations from 0 to 2 T and from 0 to 5 T are in good agreement with the experimental data. For the Pr-concentrations n=0.25, 0.5 and 0.75 the experimental data present an inverse magnetocaloric effect which was theoretically predicted and associated with the competition between the opposite magnetizations of the Gd and Pr sublattices. The two-sublattice Hamiltonian used in the calculations takes into account the crystal field, exchange and Zeeman interactions. © 2010 Elsevier B.V. All rights reserved.3236794798Pecharsky, V.K., Gschneidner, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494Brck, E., (2005) J. Phys. D, (38), p. 381Brck, E., (2007) Handbook of Magnetism and Magnetic Materials, 17, pp. 235-291Gschneidner, Jr.K.A., Pecharsky, V.K., (2008) Int. J. Refrig., 31, p. 945Gschneidner, Jr.K.A., Pecharsky, V.K., Tsokol, A.O., (2005) Rep. Prog. Phys., 68, p. 1479Von Ranke, P.J., Nbrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406De Oliveira, N.A., Von Ranke, P.J., Tovar Costa, M.V., Troper, A., (2002) Phys. Rev. B, 66, p. 094402De Oliveira, N.A., Von Ranke, P.J., (2010) Phys. Rep., 489, p. 89Von Ranke, P.J., De Oliveira, N.A., Alho, B.P., Plaza, E.J.R., De Sousa, V.S.R., Caron, L., Reis, M.S., (2009) J. Phys.: Condens. Matter., 21, p. 056004Zimm, C.B., Barclay, J.A., Johanson, W.R., (1984) J. Appl. Phys., 55, p. 2609Liu, H., Wang, D., Tang, S., Cao, Q., Tang, T., Gu, B., Du, Y., (2002) J. Alloys Compd., 346, p. 314Bohigas, X., Tejada, J., Torres, F., Arnaudas, J., Joven, E., Moral, A., (2002) Appl. Phys. Lett., 81, p. 2427Xiong, D.K., Li, D., Liu, W., Zhang, Z.D., (2005) Physica B, 369, p. 273Xiong, D.K., Li, D., Ren, W.J., Li, J., Liu, W., Zhang, Z.D., (2006) J. Alloys Compd., 413, p. 7Khan, M., Gschneidner, Jr.K.A., Pecharsky, V.K., (2010) J. Appl. Phys., 107, pp. 09A904Williams, H.J., Wernick, J.H., Sherwood, R.C., Nesbitt, E.A., (1961) J. Phys. Soc. Jpn., 17 (SUPPL. B-I), p. 91Magnus, A., Carvalho, G., Garcia, F., De Sousa, V.S.R., Von Ranke, P.J., Rocco, D.L., Loula, G.D., Gandra, F.C.G., (2009) J. Magn. Magn. Mater., 321, p. 3014Johnston, R.L., Hoffmann, R., (1992) Z. Anorg. Allg. Chem., 616, p. 105Lea, K., Leask, M., Wolf, W., (1962) J. Phys. Chem. Solids, 23, p. 1382Stevens, K.W.H., (1952) Proc. Phys. Soc. Sect. A, 65, p. 209Purwins, H.G., Leson, A., (1990) Adv. Phys., 39, p. 309Kulkarni, P.D., Thamizhavel, A., Rakhecha, V.C., Nigam, A.K., Paulose, P.L., Ramakrishnan, S., Grover, A.K., (2009) Europhys. Lett., 86, p. 4700
Theoretical Investigation On The Existence Of Inverse And Direct Magnetocaloric Effect In Perovskite Euzro 3
Full text linkWe report on the magnetic and magnetocaloric effect calculations in antiferromagnetic perovskite-type EuZrO 3. The theoretical investigation was carried out using a model Hamiltonian including the exchange interactions between nearest-neighbor and next-nearest-neighbor for the antiferromagnetic ideal G-type structure (the tolerance factor for EuZrO 3 is t = 0.983, which characterizes a small deformation from an ideal cubic perovskite). The molecular field approximation and Monte Carlo simulation were considered and compared. The calculated magnetic susceptibility is in good agreement with the available experimental data. For a magnetic field change from zero to 2 T a normal magnetocaloric effect was calculated and for a magnetic field change from zero to 1 T, an inverse magnetocaloric effect was predicted to occur below T = 3.6 K. © 2011 American Institute of Physics.1098Warburg, E., (1881) Ann. Phys., 13, p. 141. , 10.1002/andv249:5Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 10.1103/PhysRevLett.78.4494Von Ranke, P.J., De Oliveira, N.A., Gama, S., (2004) J. Magn. Magn. Mater., 277, p. 78. , 10.1016/j.jmmm.2003.10.013De Oliveira, N.A., Von Ranke, P.J., (2008) Phys. Rev. B, 77, p. 214439. , 10.1103/PhysRevB.77.214439Von Ranke, P.J., De Oliveira, N.A., Plaza, E.J.R., De Sousa, V.S.R., Alho, B.P., Magnus, A., Carvalho, G., Reis, M.S., (2008) J. Appl. Phys., 104, p. 093906. , 10.1063/1.3009974Sande, P., Hueso, L.E., Miguens, D.R., Rivas, J., Rivadulla, F., Lopez-Quintela, M.A., (2001) Appl. Phys. Lett., 79, p. 2040. , 10.1063/1.1403317Yamada, H., Goto, T., (2004) Physica B, 346-347, p. 104. , 10.1016/j.physb.2004.01.029Nobrega, E.P., De Oliveira, N.A., Von Ranke, P.J., Troper, A., (2006) Phys. Rev. B, 74, p. 144429. , 10.1103/PhysRevB.74.144429Tishin, A.M., Spichkin, Y.I., (2003) The Magnetocaloric Effect and Its Applications, , 1st ed. (Institute of Physics, Bristol)De Oliveira, N.A., Von Ranke, P.J., (2010) Phys. Rep., 489, p. 89. , 10.1016/j.physre2009.12.006Sasaki, S., Prewitt, C.T., Liebermann, R.C., (1983) Am. Mineral., 68, p. 1189Kuz'Min, M.D., Tishin, A.M., (1991) J. Phys. D: Appl. Phys., 24, p. 2039. , 10.1088/0022-3727/24/11/020Kimura, H., Numazawa, T., Sato, M., Ikeya, T., Fukuda, T., (1995) J. Appl. Phys., 77, p. 432. , 10.1063/1.359349Phan, M.-H., Yu, S.-C., Review of the magnetocaloric effect in manganite materials (2007) Journal of Magnetism and Magnetic Materials, 308 (2), pp. 325-340. , DOI 10.1016/j.jmmm.2006.07.025, PII S0304885306009577Zong, Y., Fujita, K., Akamatsu, H., Murai, S., Tanaka, K., (2010) J. Solid State Chem., 183, p. 168. , 10.1016/j.jssc.2009.10.014Kolodiazhnyi, T., Fujita, K., Wang, L., Zong, Y., Tanaka, K., Sakka, Y., Takayama-Muromachi, E., (2010) Appl. Phys. Lett., 96, p. 252901. , 10.1063/1.3456730Greedan, J.E., Chien, C.-L., Johnston, R.G., (1976) J. Solid State Chem., 19, p. 155. , 10.1016/0022-4596(76)90163-8Nobrega, E.P., De Oliveira, N.A., Von Ranke, P.J., Troper, A., Monte Carlo calculations of the magnetocaloric effect in Gd5(SixGe1-x)4 compounds (2005) Physical Review B - Condensed Matter and Materials Physics, 72 (13), pp. 1-7. , http://oai.aps.org/oai/?verb=ListRecords&metadataPrefix= oai_apsmeta_2&set=journal:PRB:72, DOI 10.1103/PhysRevB.72.134426, 134426Nbrega, E.P., De Oliveira, N.A., Von Ranke, P.J., Troper, A., (2008) J. Magn. Magn. Mater., 320, p. 147. , 10.1016/j.jmmm.2008.02.036Landau, D.P., Binder, K., (2000) A Guide to Monte Carlo Simulations in Statistical Physics, , (Cambridge University Press, Cambridge)Yang, H., Ohishi, Y., Kurosaki, K., Muta, H., Yamanaka, S., (2010) J. Alloys Compd., 504, p. 201. , 10.1016/j.jallcom.2010.05.088Terki, R., Bertrand, G., Aourag, H., Coddet, C., Thermal properties of Ba 1-xSr xZrO 3 compounds from microscopic theory (2008) Journal of Alloys and Compounds, 456 (1-2), pp. 508-513. , DOI 10.1016/j.jallcom.2007.02.133, PII S0925838807005397Bagayoko, D., Zhao, G.L., Fan, J.D., Wang, J.T., (1998) J. Phys. Condens. Matter, 10, p. 5645. , 10.1088/0953-8984/10/25/014Von Ranke, P.J., Mota, M.A., Grangeia, D.F., Carvalho, A.M.G., Gandra, F.C.G., Coelho, A.A., Caldas, A., Gama, S., Magnetocaloric effect in the RNi 5 (R = Pr, Nd, Gd, Tb, Dy, Ho, Er) series (2004) Physical Review B - Condensed Matter and Materials Physics, 70 (13), pp. 1344281-1344286. , DOI 10.1103/PhysRevB.70.134428, 13442
Theoretical Investigations On Giant Magnetocaloric Effect In Mnas 1-xsbx
No full textIn this work we apply a model to describe the magnetocaloric effect for the MnAs1-xSbx series of compounds, 0 ≤ x ≤ 0.4. The behavior of the material under first order phase transitions is well described, and we are able to obtain the magnetocaloric potential for the series of compounds presenting first order magnetic phase transitions. Based on these results we predict the performance of a composite comprising a combination of compositions of this compound to work as active element in a magnetic refrigerator using an Erickson cycle spanning a great temperature range down from room temperature. © 2003 Elsevier B.V. All rights reserved.3204302306Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494Gschneidner Jr., K.A., Pecharsky, V.K., (1997) Rare Earths: Science, Technology and Application, 3. , R.C. Bautista, C.O. Bounds, T.W. Ellis, B.T. Kilboum (Eds.), Minerals, Metals & Materials Society, WarendaleTegus, O., Brück, E., Buschow, K.H.J., De Boer, F.R., (2002) Nature, 415, p. 150Wada, H., Tanabe, Y., (2001) Appl. Phys. Lett., 79, p. 3302Wada, H., Morikawa, T., Taniguchi, K., Shibata, T., Yamada, Y., Akishige, Y., (2003) Physica B, 328, p. 114Von Ranke, P.J., Grangeia, D.F., Caldas, A., De Oliveira, N.A., (2003) J. Appl. Phys., 93, p. 4055Dan'kov, S.Yu., Tishin, A.M., Pecharsky, V.K., Gschneidner Jr., K.A., (1998) Phys. Rev. B, 57, p. 3478Von Ranke, P.J., Nobrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406De Oliveira, I.G., Caldas, A., Nobrega, E.P., De Oliveira, N.A., Von Ranke, P.J., (2000) Solid State Commun., 114, p. 487Hashimoto, T., Kuzuhara, T., Sahashi, M., Inomata, K., Tomokiyo, A., Yayama, H., (1987) J. Appl. Phys., 62, p. 3873Dai, W., (1992) J. Appl. Phys., 71, p. 5272Rodbell, D.S., (1961) Phys. Rev. Lett., 7, p. 1Smaili, A., Chahine, R., (1996) Adv. Cryog. Eng., 42, p. 445Bean, C.P., Rodbell, D.S., (1961) Phys. Rev., 126, p. 104Hashimoto, T., Numazawa, T., Shiino, M., Okada, T., (1981) Cryogenics, 21, p. 64
Heat Flow Measurements And The Order Of The Magnetic Transition In (dy,gd)co 2 Solid Solutions
No full textIn this work we present scanning heat flow measurements in the series of compounds Dy 1-xGd xCo 2 (x = 0, 0.1, 0.2, 0.3) which reveal a first order character in the magnetic transition for x = 0 and 0.1. The isothermal entropy change obtained for a magnetic field variation from 0 to 2T shows good agreement with the calculations based on a model Hamiltonian that takes into account the crystal field, magnetoelastic, exchange and Zeeman interactions. The maximum entropy change varies from 7.0 J/kg K (DyCo 2) to 1.8 J/kg K (Dy 0.7Gd 0.3Co 2) under a 2T magnetic field variation. The refrigerant cooling power (RCP) varies from 97 J/kg to 67 J/kg across the series. The entropy shows a strong correlation with the transition temperature regardless the transition type. © 2011 Elsevier B.V. All rights reserved.513615619Goto, T., Fukamichi, K., Sakakibara, T., Komatsu, H., (1989) Solid State Commun., 72, p. 945Goto, T., Sakakibara, T., Murata, K., Komatsu, H., Fukamichi, K., (1990) J. Magn. Magn. Mater., 9091, p. 700Duc, N.H., Brommer, P.E., (1999) Handbook of Magnetic Materials, 12, pp. 259-394. , Elsevier AmsterdamHerrero-Albillos, J., Casanova, F., Bartolome, F., Garcia, L.M., Labarta, A., Batlle, X., (2005) J. Magn. Magn. Mater., 290-291, p. 682Herrero-Albillos, J., Bartolome, F., Garcia, L.M., Casanova, F., Labarta, A., Battle, X., (2006) Phys. Rev. B, 73, p. 134410Khmelevskyi, S., Mohn, P., (2000) J. Phys. Condens. Matter., 12, p. 9453Liu, X.B., Altounian, Z., (2006) J. Phys. Condens. Matter., 18, p. 5503Liu, X.B., Altounian, Z., (2006) J. Appl. Phys., 99, pp. 08F709Balli, M., Fruchart, D., Gignoux, D., (2007) J. Magn. Magn. Matter., 314, p. 16Balli, M., Fruchart, D., Gignoux, D., (2008) J. Alloys Compd., 455, p. 73Tishin, A.M., Spichkin, Y.I., (2003) The Magnetocaloric Effect and Its Applications, , first ed. Institute of Physics New YorkDe Oliveira, N.A., Von Ranke, P.J., (2010) Phys. Rep., 489, p. 89Wang, D., Liu, H., Tang, S., Yang, S., Huang, S., Du, Y., (2002) Phys. Lett. A, 297, p. 247Ouyang, Z.W., Rao, G.H., Yang, H.F., Liu, W.F., Liu, G.Y., Feng, X.M., Liang, J.K., (2003) Physica B, 334, p. 118Plackowski, T., Wang, Y., Junod, A., (2002) Rev. Sci. Instrum., 73, p. 2755Johnston, R.L., Hoffmann, R., (1992) Z. Chem., 616, p. 105Lea, K., Leask, M., Wolf, W., (1962) J. Phys. Chem. Solids, 23, p. 1382Stevens, K.W.H., (1952) Proc. Phys. Soc. Section A, 65, p. 209Wang, D.H., Tang, S.L., Liu, H.D., Gao, W.L., Du, Y.W., (2002) Intermetallics, 10, p. 819Gu, K., Li, J., Ao, W., Jian, Y., Tang, J., (2007) J. Alloys Compd., 441, p. 39Liu, X.B., Altounian, Z., (2005) J. Magn. Magn. Mater., 292, p. 83Alho, B.P., De Oliveira, N.A., De Sousa, V.S.R., Plaza, E.J.R., Magnus, A., Carvalho, G., Von Ranke, P.J., (2010) J. Phys.: Condens. Matter., 22, p. 486008Santana, R.P., De Oliveira, N.A., Von Ranke, P.J., (2011) J. Alloys Compd., 509, p. 6346Chen, X., Zhuang, Y.H., Yan, J.L., Fei, F., (2009) J. Alloys Compd., 479, p. 35Balli, M., Fruchart, D., Gignoux, D., (2011) J. Alloys Compd., 509, p. 3907Singh, N.K., Kumar, P., Suresh, K.G., Coelho, A.A., Gama, S., Nigam, A.K., (2007) J. Phys. D: Appl. Phys., 40, p. 162
Theoretical Investigation On The Magnetocaloric Effect In Mnas Using A Microscopic Model To Describe The Magnetic And Thermal Hysteresis
No full textWe report the thermal and magnetic hysteresis diagram for MnAs that comes from a microscopic description of a magnetic system through a model Hamiltonian that takes into account the magnetoelastic interaction. The temperature and magnetic hysteresis intervals are governed by the magnetoelastic interaction parameter, which leads to the energy barrier between stable and metastable minima in the exact free energy, obtained from our microscopic model. Application of the model to the MnAs first-order magnetic material, which presents high hysteresis effect, leads to a good agreement with the experimental magnetic and magnetocaloric data. © 2012 Elsevier Ltd. All rights reserved.15211951954Pecharsky, V.K., Gschneidner, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494Pecharsky, V.K., Gschneidner, Jr.K.A., (1998) Adv. Cryog. Eng., 43, p. 1729Gschneidner, Jr.K.A., Pecharsky, V.K., (2000) Mater. Sci. Eng. A, 287, p. 301Pecharsky, V.K., Gschneidner, Jr.K.A., (2001) Adv. Mater., 13, p. 683Hu, F., Shen, B., Sun, J., Cheng, Z., (2001) Appl. Phys. Lett., 78, p. 3675Wada, H., Tanabe, Y., (2001) Appl. Phys. Lett., 79, p. 3302Wada, H., Taniguchi, K., Tanabe, Y., (2002) Mater. Trans., JIM, 43, p. 73Wada, H., Morikawa, T., Taniguchi, K., Shibata, T., Yamada, Y., Akishige, Y., (2002) Physica B, 328, p. 114Tegus, O., Brück, E., Buschow, K.H.J., De Boer, F.R., (2002) Nature, 415, p. 150Tegus, O., Brück, E., Zhang, L., Dagula, W., Buschow, K.H.J., De Boer, F.R., (2002) Physica B, 319, p. 174Fujita, A., Fujieda, S., Hasegawa, Y., Fukamich, K., (2003) Phys. Rev. B, 67, p. 104416Strässle, Th., Furrer, A., Hossain, Z., Geibel, Ch., (2003) Phys. Rev. B, 67, p. 054407Von Ranke, P.J., De Oliveira, N.A., Alho, B.P., De Sousa, V.S.R., Plaza, E.J.R., Carvalho, A.M.G., (2010) J. Magn. Magn. Mater., 322, pp. 84-87Strässle, Th., Juranyi, F., Schneider, M., Janssen, S., Furrer, A., Krämer, K.W., Güdel, H.U., (2004) Phys. Rev. Lett, 92, p. 257202Castellano, G., (2003) J. Magn. Magn. Mater., 260, p. 146Bean, C.P., Rodbell, D.S., (1962) Phys. Rev., 126, p. 104Von Ranke, P.J., De Campos, A., Caron, L., Coelho, A.A., Gama, S., De Oliveira, N.A., (2004) Phys. Rev. B, 70, p. 094410Neumann, K.U., Dann, S., Fröhlich, K., Murani, A., Ouladdiaf, B., Ziebeck, K.R.A., (2005) Lect. Notes Phys., 678, pp. 87-96Magnus, A., Carvalho, G., Coelho, A.A., Gama, S., Gandra, F.C.G., Von Ranke, P.J., De Oliveira, N.A., (2009) Eur. Phys. J. B, 68, pp. 67-72Huang, K., (1987) Statistical Mechanics, 17 CHAPTER, p. 428. , 2 nd ed. Wiley New JerseyVon Ranke, P.J., Gama, S., Coelho, A.A., De Campos, A., Magnus, A., Carvalho, G., Gandra, F.C.G., De Oliveira, N.A., (2006) Phys. Rev. B, 73, p. 014415Magnus, A., Carvalho, G., Coelho, A.A., Von Ranke, P.J., Alves, C.S., (2011) J. Alloys Compd, 509, p. 345
Spin Reorientation And The Magnetocaloric Effect In Ho Yer (1-y)n
No full textWe report on the magnetic and magnetocaloric effect calculations in rare earth mononitrides Ho yEr (1-y)N (y = 0, 0.5, 0.75, and 1). The magnetic Hamiltonian includes the crystalline electrical field in both magnetic sublattices; disorder in exchange interactions among Ho-Ho, Er-Er, and Ho-Er magnetic ions and the Zeeman effect. The theoretical results for the magnetic entropy change and adiabatic temperature change are in good agreement with the available experimental data. Besides, ferrimagnetic arrangement, inverse magnetocaloric effect, and spin reorientation transition (spin flop process) were predicted and quantitatively described. © 2012 American Institute of Physics.11111De Oliveira, N.A., Von Ranke, P.J., (2010) Phys. Rep., 489, p. 89. , 10.1016/j.physre2009.12.006Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 10.1103/PhysRevLett.78.4494Reis, M.S., Sobolev, N.A., Valente, M.A., Sato, K., Todate, Y., Bouravleuv, A., Von Ranke, P.J., Gama, S., (2008) Phys. Rev. B, 77, p. 104439. , 10.1103/PhysRevB.77.104439Von Ranke, P.J., Pecharsky, V.K., Gschneidner, K.A., Korte, B.J., (1998) Phys. Rev. B, 58, p. 14436. , 10.1103/PhysRevB.58.14436Sande, P., Hueso, L.E., Miguens, D.R., Rivas, J., Rivadulla, F., Lopez-Quintela, M.A., (2001) Appl. Phys. Lett., 79, p. 2040. , 10.1063/1.1403317Nikitin, S.A., Skokov, K.P., Koshkid'Ko, Yu.S., Pastushenkov, Yu.G., Ivanova, T.I., (2010) Phys. Rev. Lett., 105, p. 137205. , 10.1103/PhysRevLett.105.137205Aczel, A.A., Kohama, Y., Marcenat, C., Weickert, F., Jaime, M., Ayala-Valenzuela, O.E., McDonald, R.D., Luke, G.M., (2009) Phys. Rev. Lett., 103, p. 207203. , 10.1103/PhysRevLett.103.207203Nakagawa, T., Arakawa, T., Sako, K., Tomioka, N., Yamamoto, T.A., Kusunose, T., Niihara, K., Numazawa, T., (2006) J. Alloys Compd., 408-412, p. 192. , 10.1016/j.jallcom.2005.04.061Yamamoto, T.A., Nakagawa, T., Sako, K., Arakawa, T., Nitani, H., (2004) J. Alloys Compd., 376, p. 17. , 10.1016/j.jallcom.2003.12.012Nakagawa, T., Sako, K., Arakawa, T., Tomioka, N., Yamamoto, T.A., Kamiya, K., Numazawa, T., (2006) J. Alloys Compd., 408-412, p. 187. , 10.1016/j.jallcom.2005.04.046Nakagawa, T., Sako, K., Arakawa, T., Yamamoto, T.A., (2004) J. Alloys Compd., 364, p. 53. , 10.1016/S0925-8388(03)00546-2Hirayama, Y., Tomioka, N., Nishio, S., Kusunose, N., Nakagawa, T., Kamiyad, K., Numazawa, T., Yamamoto, T.A., (2008) J. Alloys Compd., 462, pp. 12-L15. , 10.1016/j.jallcom.2007.08.052Nóbrega, E.P., De Oliveira, N.A., Von Ranke, P.J., Troper, A., (2006) Phys. Rev. B, 74, p. 144429. , 10.1103/PhysRevB.74.144429Tang, G.X., Nolting, W., (2006) Phys. Rev. B, 73, p. 024415. , 10.1103/PhysRevB.73.024415Lea, K.R., Leask, M.J.M., Wolf, W.P., (1962) J. Phys. Chem. Solids, 33, p. 1381. , 10.1016/0022-3697(62)90192-0Stevens, K.W.H., (1952) Proc. Phys. Soc. A, 65, p. 209. , 10.1088/0370-1298/65/3/308Hulliger, F., (1979) Handbook on the Physics and Chemistry of Rare Earths, 4, p. 153. , edited by K. A. Gschneidner, Jr. and L. Eyring, North-Holland Publishing CompanyStutius, W., (1969) Phys. Kondens. Mater., 10, p. 152. , 10.1007/BF02422675Junod, P., Menth, A., Vogt, O., (1969) Phys. Kondens. Mater., 8, p. 323. , 10.1007/BF02422864Li, D.X., Nimori, S., Shikama, T., (2010) Solid State Commun., 150, p. 1865. , 10.1016/j.ssc.2010.07.049Hu, W.J., Du, J., Li, B., Zhang, Q., Zhang, Z.D., (2008) Appl. Phys. Lett., 92, p. 192505. , 10.1063/1.2928233Freeman, A.J., Watson, R.E., (1962) Phys. Rev., 127, p. 2058. , 10.1103/PhysRev.127.205
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