1,720,959 research outputs found
Erratum: Large Magnetocaloric Effect And Refrigerant Capacity Near Room Temperature In As-cast Gd5ge2si2-xsn X Compounds (applied Physics Letters (2013) 102 (192410))
No full text[No abstract available]1042Carvalho, A.M.G., Tedesco, J.C.G., Pires, M.J.M., Soffner, M.E., Guimarães, A.O., Mansanares, A.M., Coelho, A.A., Large magnetocaloric effect and refrigerant capacity near room temperature in as-cast Gd5Ge2Si2 -xSnx compounds (2013) Appl. Phys. Lett., 102, p. 192410. , 10.1063/1.480697
Anisotropic Magnetocaloric Effect In Gadolinium Thin Films: Magnetization Measurements And Acoustic Detection
No full textIn this letter, it is demonstrated the ability of the magnetoacoustic technique in detecting the magnetocaloric effect in gadolinium thin films (1.0 μm and 3.0 μm thick), which is not accessible through conventional temperature sensors because of the reduced mass of the samples. The method, which detects the direct effect of the sample temperature variation, proved to be sensitive to the anisotropy of the films, making possible for the investigation of the anisotropic magnetocaloric effect. Magnetization measurements were also carried out, and from these measurements both the adiabatic temperature and the isothermal entropy variations were calculated. The acoustically detected magnetocaloric effect shows very good agreement with these calculations. © 2013 AIP Publishing LLC.11416Pecharsky, V.K., Gschneidner, Jr.K.A., (1999) J. Magn. Magn. Mater., 200, p. 44. , 10.1016/S0304-8853(99)00397-2Pecharsky, V.K., Gschneidner, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 10.1103/PhysRevLett.78.4494Gadioli, G.Z., Rouxinol, F.P., Gelamo, R.V., Santos, A.O., Cardoso, L.P., Moraes, M.A.B., (2008) J. Appl. Phys., 103, p. 093916. , 10.1063/1.2838462Soffner, M.E., Guimarães, A.O., Da Silva, E.C., Mansanares, A.M., (2013) Appl. Phys. A, 112, pp. 403-409. , 10.1007/s00339-012-7414-4Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coelho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2009) Phys. Rev. B, 80, p. 134406. , 10.1103/PhysRevB.80.134406Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coelho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2010) J. Appl. Phys., 107, p. 073524. , 10.1063/1.3357375Soffner, M.E., Mansanares, A.M., Gandra, F.C.G., Coelho, A.A., Gama, S., Carvalho, A.M.G., Pires, M.J.M., Da Silva, E.C., (2010) J. Phys. D: Appl. Phys., 43, p. 445002. , 10.1088/0022-3727/43/44/445002Soffner, M.E., Tedesco, J.C.G., Pedrochi, F., Gadioli, G.Z., De Moraes, M.A.B., Guimarães, A.O., Da Silva, E.C., Mansanares, A.M., (2012) Thin Solid Films, 520, pp. 3634-3640. , 10.1016/j.tsf.2011.12.042Pecharsky, V.K., Gschneidner, Jr.K.A., (1999) J. Appl. Phys., 86, p. 565. , 10.1063/1.370767Glorieux, C., Thoen, J., Bednarz, G., White, M.A., Geldart, D.J.W., (1995) Phys. Rev. B, 52, p. 12770. , 10.1103/PhysRevB.52.12770Bahl, C.R.H., Nielsen, K.K., (2009) J. Appl. Phys., 105, p. 013916. , 10.1063/1.3056220Foldeaki, M., Chahine, R., Bose, T.K., (1995) J. Appl. Phys., 77 (7), p. 3528. , 10.1063/1.358648Miller, C.W., Williams, D.V., Bingham, N.S., Srikanth, H., (2010) J. Appl. Phys., 107, pp. 09A903. , 10.1063/1.3335515Kirby, B.J., Lau, J.W., Williams, D.V., Bauer, C.A., Miller, C.W., (2011) J. Appl. Phys., 109, p. 063905. , 10.1063/1.3555101Touloukian, Y.S., Powell, R.W., Ho, C.Y., Nicolaou, M.C., (1973) Thermophysical Properties of Matter: Thermal Diffusivity, , (IFI/Plenum, New York, Washington), Vol. 1
Angular Dependence Of The Photothermally Modulated Magnetic Resonance In Gd Thin Films
No full textIn this paper we use electron spin resonance and photothermally modulated magnetic resonance techniques to investigate gadolinium thin films as a function of the orientation of the film surface with respect to the external magnetic field and of the temperature, around the magnetic phase transition temperature. We observe that, in the ferromagnetic phase, the resonance line is shifted up to higher external magnetic fields when the angle between the film surface and the field increases, revealing the magnetic anisotropy of the sample. At the same time, when the temperature is augmented to values higher than the phase transition temperature, the external field of the resonance collapses back to the expected value in the paramagnetic phase for all orientations. We also demonstrated that, even for the perpendicular orientation (magnetic field perpendicular to the sample surface), the photothermally modulated magnetic resonance signal is maximized near the magnetic phase transition temperature. Furthermore, in the ferromagnetic phase the photothermally modulated magnetic resonance intensity is very sensitive to the orientation, showing a significant enhancement in the perpendicular direction. © 2012 Springer-Verlag Berlin Heidelberg.1122403409Orth, T., Netzelmann, U., Pelzl, J., (1988) Appl. Phys. Lett., 53, p. 1979. , 1988ApPhL.53.1979O 10.1063/1.100338Romano, J.A., Mansanares, A.M., Da Silva, E.C., Vargas, H., (1994) J. Phys., 4. , C7-667Meckenstock, R., Spodding, D., Pelzl, J., (2002) J. Magn. Mater., 240, p. 83. , 2002JMMM.240.83M 10.1016/S0304-8853(01)00754-5Poole, Jr.C.P., (1983) Electron Spin Resonance, , Wiley New YorkAbragam, A., Bleaney, B., (1986) Electron Paramagnetic Resonance of Transition Ions, , Dover New YorkSoffner, M.E., Tedesco, J.C.G., Mansanares, A.M., Gadioli, G.Z., Rouxinol, F.P., De Moraes, M.A.B., Da Silva, E.C., (2010) J. Phys. Conf. Ser., 214. , 012092 2010JPhCS.214a2092S 10.1088/1742-6596/214/1/012092Soffner, M.E., Tedesco, J.C.G., Pedrochi, F., Gadioli, G.Z., De Moraes, M.A.B., Guimarães, A.O., Da Silva, E.C., Mansanares, A.M., (2012) Thin Solid Films, 520, p. 3634. , 2012TSF.520.3634S 10.1016/j.tsf.2011.12.042Pecharsky, V.K., Gschneider, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 1997PhRvL.78.4494P 10.1103/PhysRevLett.78.4494Foldeaki, M., Schnelle, W., Gmelin, E., Bernard, P., Koszegi, B., Giguere, A., Chahine, R., Bose, T.K., (1997) J. Appl. Phys., 82, p. 309. , 1997JAP.82.309F 10.1063/1.365813Tishin, A.M., Spichkin, Y.I., (2003) The Magnetocaloric Effect and Its Applications, , Inst. Phys. Ser. Condens. Matter Phys. Institute of Physics Bristol 10.1887/0750309229Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coellho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2009) Phys. Rev. B, 80. , 134406 2009PhRvB.80m4406G 10.1103/PhysRevB.80.134406Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coellho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2010) J. Appl. Phys., 107. , 073524 2010JAP.107g3524G 10.1063/1.3357375Soffner, M.E., Mansanares, A.M., Gandra, F.C.G., Coelho, A.A., Gama, S., Carvalho, A.M.G., Pires, M.J.M., Da Silva, E.C., (2010) J. Phys. D, Appl. Phys., 43. , 445002 2010JPhD.43.5002S 10.1088/0022-3727/43/44/445002Gadioli, G.Z., Rouxinol, F.P., Gelamo, R.V., Dos Santos, A.O., Cardoso, L.P., De Moraes, M.A.B., (2008) J. Appl. Phys., 103. , 093916 2008JAP.103i3916G 10.1063/1.2838462Zakeri, Kh., Lindner, J., Barsukov, I., Meckenstock, R., Farle, M., Von Hörsten, U., Wende, H., Frait, Z., (2007) Phys. Rev. B, 76. , 104416 2007PhRvB.76j4416Z 10.1103/PhysRevB.76.104416Lindner, J., Barsukov, I., Raeder, C., Hassel, C., Posth, O., Meckenstock, R., Landeros, P., Mills, D.L., (2009) Phys. Rev. B, 80. , 224421 2009PhRvB.80v4421L 10.1103/PhysRevB.80.224421Rezende, S.M., Moura, J.A.S., De Aguiar, F.M., (1994) Phys. Rev. B, 49, p. 15105. , 1994PhRvB.4915105R 10.1103/PhysRevB.49.15105Landau, L.D., Lifshitz, E.M., (1935) Phys. Z. Sowjetunion, 8, p. 153. , 0012.28501Kittel, C., (1947) Phys. Rev., 71, p. 270. , 1947PhRv.71.270K 10.1103/PhysRev.71.270.2Kittel, C., (1948) Phys. Rev., 73, p. 155. , 1948PhRv.73.155K 10.1103/PhysRev.73.155Mansanares, A.M., Fournier, D., Boccara, A.C., (1993) Electron. Lett., 29 (23), p. 2045. , 10.1049/el:19931366Bernal-Alvarado, J., Mansanares, A.M., Da Silva, E.C., Moreira, S.G.C., (2003) Rev. Sci. Instrum., 74 (1), p. 697. , 2003RScI.74.697B 10.1063/1.1517726Glorieux, C., Thoen, J., Bednarz, G., White, M.A., Geldart, D.J.W., (1995) Phys. Rev. B, 52, p. 12770. , 1995PhRvB.5212770G 10.1103/PhysRevB.52.12770Lide, D.R., (1991) CRC Handbook of Chemistry and Physics, , 72 CRC Press Boca Rato
Photothermally Modulated Magnetic Resonance Applied To The Study Of The Magnetic Phase Transition In Gadolinium Thin Films
No full textWe explore the photothermally modulated magnetic resonance technique to investigate gadolinium thin films deposited on fused quartz substrate, as a function of thickness and thermal treatment, around the magnetic phase transition temperature. It has been observed that the maximum amplitude of the photothermally modulated magnetic resonance (PM-MR) signal takes place near the phase transition temperature, similarly to the magnetocaloric effect, for which Gd has been the prototype material. The reason is that both depend on the temperature derivative of the magnetization, which maximizes at the phase transition. Besides, there is a narrowing of transition with thermal treatment, confirming that thermal treatment stabilizes the film structure. For frequency scan measurements, the heat diffusion in a two-layer system was considered, and a depth profile study was carried out in order to investigate heterogeneities along the film thickness. From the PM-MR response as a function of the modulation frequency it was possible to estimate the thermal properties of the Gd film. Magnetization, X-ray and electron spin resonance measurements were used to complement the analysis and support the conclusions. © 2011 Elsevier B.V. All rights reserved.520936343640Ohring, M., (1991) The Materials Science of Thin Films, , Academic Press New YorkPrutton, M., (1964) Thin Ferromagnetic Films, , Butterworth WashingtonPoole, Jr.C.P., (1983) Electron Spin Resonance, , John Wiley & Sons New YorkAbragam, A., Bleaney, B., (1986) Electron Paramagnetic Resonance of Transitions Ions, , Dover New YorkOrth, T., Netelmann, U., Pelzl, J., (1988) Appl. Phys. Lett., 53, p. 1979Romano, J.A., Mansanares, A.M., Da Silva, E.C., Vargas, H., (1994) J. Phys., 4, pp. C7-667Meckenstock, R., Spodding, D., Pelzl, J., (2002) J. Magn. Mater., 240, p. 83Pecharsky, V.K., Gschneider, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494Foldeaki, M., Schnelle, W., Gmelin, E., Bernard, P., Koszegi, B., Giguere, A., Chahine, R., Bose, T.K., (1997) J. Appl. Phys., 82, p. 309Tishin, A.M., Spichkin, Y.I., (2003) The Magnetocaloric Effect and Its Applications, , Institute of Physics Series in Condensed Matter Physics BristolMorelli, D.T., Mance, A.M., Mantese, J.M., Micheli, A.L., (1996) J. Appl. Phys., 79, p. 373Gadioli, G.Z., Rouxinol, F.P., Gelamo, R.V., Dos Santos, A.O., Cardoso, L.P., De Moraes, M.A.B., (2008) J. Appl. Phys., 103, p. 093916Recarte, V., Pérez-Landazábal, J.I., Sánchez- Alárcos, V., Chemenko, V.A., Ohtsuka, M., (2009) Appl. Phys. Lett., 95, p. 141908Solzi, M., Pernechele, C., Ghidini, M., Natali, M., Bolzan, M., (2010) J. Magn. Magn. Mater., 322, p. 1565Pelzl, J., Netzelmann, U., (1989) Topics in Currents Physics: Photoacoustic, Photothermal and Photochemical Processes at Surfaces and in Thin Films, p. 313. , P. Hess, Springer-Verlag BerlinGuimarães, A.O., Soffner, M.E., Mansanares, A.M., Coellho, A.A., Magnus, A., Carvalho, G., Pires, M.J.M., Da Silva, E.C., (2009) Phys. Rev. B, 80, p. 134406Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coellho, A.A., Magnus, A., Carvalho, G., Pires, M.J.M., Da Silva, E.C., (2010) J. Appl. Phys., 107, p. 073524Soffner, M.E., Tedesco, J.C.G., Mansanares, A.M., Gadioli, G.Z., Rouxinol, F.P., De Moraes, M.A.B., Da Silva, E.C., (2010) J. Phys. Conf. Ser., 214, p. 012092Nakamura, O., Baba, K., Ishii, H., Takeda, T., (1988) J. Appl. Phys., 64, p. 3614Farle, M., Baberschke, K., (1987) Phys. Rev. Lett., 58, p. 511Bugardt, P., Seehra, M.S., (1977) Phys. Rev. B, 16, p. 1802Chiba, Y., Nakamura, A., (1970) J. Phys. Soc. Jpn, 29, p. 792Freitas, L.R., Mansanares, A.M., Da Silva, E.C., (2003) Rev. Sci. Instrum., 74, p. 735Glorieux, C., Thoen, J., Bednarz, G., White, M.A., Geldart, D.J.W., (1995) Phys. Rev. B, 52, p. 12770Lide, D.R., (1991) CRC Handbook of Chemistry and Physics, , 72nd ed. CRC PressPetrakian, J.P., Ahmed Mokhtar, N., Fraisse, R., (1977) J. Phys. F: Met. Phys., 7, p. 2431Almond, D.P., Patel, P.M., (1996) Photothermal Science and Techniques, , Chapman & Hall LondonTouloukian, Y.S., Buyco, E.H., (1970) Thermophysical Properties of Matter, , IFI/Plenum New York-Washingto
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
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Appropriate Similarity Measures for Author Cocitation Analysis
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Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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