2,219 research outputs found
Concentration Dependence Of Hyperfine Parameters Of Fe-cu Alloys
No full textFe-Cu alloys produced by mechanical alloying were studied by Mössbauer spectroscopy. Room-temperature Mössbauer spectroscopy done on samples of Fex-Cu100-x (10< x< 45) show a change with concentration, from a superparamagnetic doublet to a broad sextet. The isomer shift behavior with concentration is analyzed with a simple model based on the chemical neighborhood. Quadrupole splitting slightly increases with concentration. Hyperfine parameters of high-temperature spectra of concentrated samples follow the behavior observed for the less-concentrated samples. A comparison with the hyperfine parameters of Fe-Cu alloys obtained by sputtering is done.2297101Uenishi, K., Kobayashi, K., Nasu, S., Hatano, H., Ishihara, K., Shingu, P.H., (1992) Z. Metallkd., 83, p. 132Yavari, A.R., Desré, P.J., Benameur, T., (1992) Phys. Rev. Lett., 68, p. 2235Ma, E., Atzmon, M., Pinkerton, F.E., (1993) J. Appl. Phys., 74 (2), p. 955Eilon, M., Ding, J., Street, R., (1995) J. Phys.: Condens. Matter, 7, p. 4921Saxena, S.S., Tang, J., Lee, Y., O'Connor, C.J., (1994) J. Appl. Phys., 76 (10), p. 6820Ding, J., Eilon, M., Street, R., St Pierre, T., Smith, P., McCormick, P.G., (1995) J. Magn. Magn. Mat., 140-144, p. 471Barro, M.J., Navarro, E., Agudo, P., Hernando, A., Crespo, P., García Escorial, A., (1997) Mat. Sci. Forum, 235-238, p. 553Socolovsky, L.M., Sánchez, F.H., Yasuna, K., Otsuki, A., Ishihara, K., Shingu, P.H., (1998) Hyp. Int. (C), 3, p. 210Jiang, J.Z., Gonser, U., Gente, C., Bormann, R., (1993) Appl. Phys. Lett., 63 (20), p. 2768Socolovsky, L.M., Sánchez, F.H., Shingu, P.H., (2001) Hyp. Int., 133, p. 47Shenoy, G., Wagner, F., (1978) Mössbauer Isomer Shifts, p. 409. , North Holland, AmsterdamChien, C.L., Liou, S.H., Kofalt, D., Wu, Y., Egami, T., McGuire, T.R., (1986) Phys. Rev. B, 33, p. 3247L. M. Socolovsky, F. H. Sánchez, unpublished resultsMonteiro, D.W.L., Larica, C., Nunes, E., Passamani, E.C., Alves, K.M.B., (1998) Hyperfine Interactions (C), 3, p. 17Elkalkouli, R., Chartier, P., Dinhut, J.F., (1995) Mat. Sci. Forum, 179-181, p. 267Macrí, P.P., Rose, P., Frattini, R., Enzo, S., Principi, G., Hu, W.X., Cowlam, N., (1994) J. Appl. Phys., 76 (7), p. 4061Agüero, O.E., Socolovsky, L.M., Torriani, I.L., Crystallite size and strain study of a nanostructured Fe-Cu alloy from diffraction profile analysis (2003) ISMANAM Conference, , presentation to the, Foz do Iguaçu, BrazilMcLean, A.B., Mitchell, C.E.J., Swanston, D.M., (1994) Journal of Electron Spectroscopy, 69, pp. 125-132Socolovsky, L.M., Sánchez, F.H., (2003) Materials Characterization, 50, pp. 123-12
Thermal Scanning Studies Of Percolated Fe-cu Granular Alloys
No full textFe-Cu alloys produced by mechanical alloying were studied with Mössbauer thermal scanning spectroscopy (MTS). This technique consists in recording Mössbauer effect absorption at a fixed energy while the temperature of the sample is changed. Hyperfine magnetic field behavior can be closely followed. Four mechanically alloyed samples FexCu 100-x with iron concentration x=30, 35, 40, and 45 at.% were studied. Absorption graphs (intensity vs. temperature) are similar for all samples: intensity sharply falls with the increase of the temperature, following the collapse of the sextet lines. This collapse occurs at a very precise temperature, which coincides with a magnetic-nonmagnetic transition line in a former magnetic phase diagram. Conventional Mössbauer spectroscopy confirms the appointed phase change, displaying a doublet at temperatures above the critical. © 2003 Elsevier Inc. All rights reserved.5002/03/15123125Uenishi, K., Kobayashi, K., Nasu, S., Hatano, H., Ishihara, K., Shingu, P.H., Mechanical alloying in the Fe-Cu system (1992) Z. Metallkd., 83, p. 132Socolovsky, L.M., Sánchez, F.H., Yasuna, K., Otsuki, A., Ishihara, K., Shingu, P.H., Mössbauer measurements in GMR system FexCu 100-x prepared by MA (1998) Hyperfine Interact. C, 3, pp. 210-214Socolovsky, L.M., Sánchez, F.H., Shingu, P.H., Magnetic structure of FexCu100-x magnetoresistive alloys produced by mechanical alloying (2001) Hyperfine Interact., 133, pp. 47-52Mendoza Zélis, P., Pasquevich, G., Sánchez, F.H., Martínez, N., Veiga, A., A new application of Mössbauer effect thermal scans: Determination of the magnetic hyperfine field temperature dependence (2002) Phys. Lett. A, 298, pp. 55-59Martínez, N., Mayosky, M., Spinelli, E., Veiga, A., Mendoza Zélis, P., Pasquevich, G., A constant-velocity Mössbauer spectrometer with controlled temperature sweep J. Sci. Instrum., , [submitted for publication]Fernández van Raap, M.B., Socolovsky, L.M., Sánchez, F.H., Torriani, I., SAXS study of nanocrystalline FeyCu1-y alloys produced by ball milling (2002) J. Phys. Condens. Matter, 14, pp. 857-864Monteiro, D.W.L., Larica, C., Nunes, E., Passamani, E.C., Alves, K.M.B., Magnetic and structural properties of the Cu/Fe alloys obtained by milling (1998) Hyperfine Interact. C, 3, pp. 17-20Ma, E., Atzmon, M., Pinkerton, F.E., Thermodynamic and magnetic properties of metastable FexCu 100-x solid solutions formed by mechanical alloying (1993) J. Appl. Phys., 74, p. 955Ambrose, T., Gavrin, A., Chien, C.L., Magnetic properties of metastable fcc Fe-Cu alloys prepared by high energy ball milling (1993) J. Magn. Magn. Mater., 124, p. 1
Rainbow Valley as embodied heaven: L.M. Montgomery’s narrative spirituality in Rainbow Valley
No full textIntriguingly, L.M. Montgomery’s generally realistic fiction is filled with fantastic elements. This article argues that by following Montgomery into the heavenly fairyland of Rainbow Valley, readers can discern a joyful, creative, imaginative, and integrated image of spiritual life in the conversations, the characters, and the magic valley itself
Effects Of Dipolar Interactions On Magnetic Properties Of Granular Solids
No full textThe magnetic behavior of superparamagnetic Co nanoparticles (2-4 nm in diameter) dispersed in an amorphous, insulating SiO2 matrix was studied. Conventional fittings of magnetization curves present mean magnetic moments which diminish with decrease in temperature. In order to treat this anomalous behavior, we have applied the interacting superparamagnetic model (ISP). Mean diameters obtained from transmission electron microscopy (TEM) were compared with values obtained applying ISP model. © 2005 Elsevier B.V. All rights reserved.2942127132Battle, X., Labarta, A., (2002) J. Phys. D, 35, pp. R15Skomski, R., (2003) J. Phys.: Condens. Matter, 15, pp. R841Néel, L., (1949) Ann. Geophys., 5, p. 99Bean, C., Livingston, J.D., (1959) J. Appl. Phys., 30, pp. 120SFerrari, E.F., Da Silva, F.C.S., Knobel, M., (1997) Phys. Rev. B, 56, p. 6086Bastos, C.S.M., Bahiana, M., Nunes, W.C., Novak, M.A., Knobel, M., Vargas, P., Altbir, D., (2003) Phys. Rev. B, 66, p. 214407Mørup, S., Tronc, E., (1994) Phys. Rev. Lett., 72, p. 3278Dormann, J.L., Fiorani, D., Tronc, E., (1997) Adv. Chem. Phys., 98, p. 283Allia, P., Coisson, M., Tiberto, P., Vinai, F., Knobel, M., Novak, M.A., Nunes, W.C., (2001) Phys. Rev. B, 64, p. 144420Binns, C., Maher, M.J., Pankhurst, Q.A., Kechcrakos, D., Trohidou, K.N., (2002) Phys. Rev. B, 66, p. 184413Tartaj, P., Gonzalez-Carreño, T., Bomati-Miguel, O., Serna, C.J., Bonville, P., (2004) Phys. Rev. B, 69, p. 94401Allia, P., Tiberto, P., Vinai, F., (1997) J. Appl. Phys., 81, p. 4599Morrish, A.H., (1966) The Physical Principles of Magnetism, , Wiley New YorkKittel, C., (1968) Introduction to Solid State Physics, , Wiley New YorkSocolovsky, L.M., Denardin, J.C., Brandl, A.L., Knobel, M., Zhang, X.X., (2003) J. Magn. Magn. Mater., 262, p. 102Knobel, M., Nunes, W.C., Brandl, A.L., Vargas, J.M., Socolovsky, L.M., Zanchet, D., (2004) Phys. B: Cond. Matt., 354, p. 80noteAllia, P., Coisson, M., Tiberto, P., Vinai, F., Knobel, M., Novak, M.A., Nunes, W.C., (2001) Phys. Rev. B, 64, p. 144420Brandl, A.L., Denardin, J.C., Socolovsky, L.M., Knobel, M., Allia, P., (2004) J. Magn. Magn. Mater., 272-276, p. 1526Kechrakos, D., Trohidou, K.N., (2000) Phys. Rev. B, 62, p. 394
Befriending the darkness: L.M. Montgomery’s lived theodicy in Anne’s House of Dreams
No full textIn Anne’s House of Dreams, which Elizabeth Epperly calls Montgomery’s most philosophical novel, Montgomery delves into painful topics of loss, suicide, bad marriages, ill-timed love, poverty, and the beautiful-terrible consequences of duty. The result is a complex and nuanced consideration of faithful living in the face of unexplainable evil that functions as a lived theodicy in story form.
“I reckon when the darkness is close to us it is a friend. But when we sorter push it away from us—divorce ourselves from it, so to speak, with lantern light—it becomes an enemy.”
—L.M. Montgomery, Captain Jim in Anne’s House of Dream
Superparamagnetism And Other Magnetic Features In Granular Materials: A Review On Ideal And Real Systems
No full textAn overview on magnetic of nanostructured magnetic materials is presented, with particular emphasis on the basic features displayed by granular nanomagnetic solids. Besides a review of the basic concepts and experimental techniques, the role of structural disorder (mainly the distribution of grain sizes), interparticle magnetic interactions and surface effects are also discussed with some detail. Recent results, models and trends on the area are also discussed. Copyright © 2008 American Scientific Publishers All rights reserved.8628362857(1991) Science and Technology of Nanostructured Magnetic Materials, Series B: Physics, 259. , G. C. Hadjipanayis and G. A. Prinz eds, Plenum Press, New York, NATO Advanced Study Institute(1992) Magnetic Properties of Fine Particles, , J. L. Dormann and D. 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Influence Of Silver Concentrations On Structural And Magnetic Properties Of Ag-fe 3o 4 Heterodimer Nanoparticles
No full textIn the present work, we have reported the effect of Ag NPs seeds on the growth and magnetic properties of Ag-F e3O 4 heterodimer nanoparticles prepared using a two step chemical approach. Three different Ag NPs concentrations have been tried and thoroughly characterized using small angle X-ray scattering (SAXS), transmission electron microscopy (TEM), X-ray diffraction (XRD), dc magnetization, and X-ray absorption near edge spectroscopy (XANES). It is observed that at low concentration, the "flower" types of nanoparticles are more favorable whereas the higher concentration of Ag NPs seeds promotes the growth of dimer type of structures. Our dc magnetization results are well correlated to the structural ones. The sample with lower amount of starting Ag NPs seeds possesses highest blocking and irreversibility temperature. On the other hand, the sample with highest concentration of Ag NPs seeds, the blocking temperature is lowered. Copyright © 2012 American Scientific Publishers All rights reserved.12969616967Krishnan, K.M., (2010) IEEE Trans. on Mag, 46, p. 2523Knobel, M., Nunes, W.C., Socolovsky, L.M., De Biasi, E., Vargas, J.M., Denardin, J.C., (2008) J. Nanosci. Nanotechnol., 8, p. 2836Serantes, D., Baldomir, D., Pereiro, M., Botana, J., Prida, V.M., Hernando, B., Arias, J.E., Rivas, J., (2010) J. Nanosci. Nanotechnol., 10, p. 2512Hori, H., Yamamoto, Y., Ywamoto, T., Miura, T., Teranishi, T., Miyake, M., (2004) Phys. Rev. B, 69, p. 174411Crespo, P., Litrán, R., Rojas, T.C., Multigner, M., De La Fuente, J.M., Sánchez-Lspez, J.C., Garcá, M.A., Fernéndez, A., (2004) Phys. Rev. Lett., 93, p. 087204Crespo, P., García, M.A., Fernéndez Pinel, E., Multigner, M., Alcántara, D., De La Fuente, J.M., Penadés, S., Hernando, A., (2006) Phys. ReV. Lett., 97, p. 177203Arruebo, M.R., Ibarra, M.R., Santamaría, J., (2007) Nano Today, 2, p. 22Goya, F., Grazu, V., Ibarra, M.R., (2008) Curr. Nanosci., 4, p. 1Pankhurst, Q.A., Connolly, J., Jones, S.K., Dobson, J., (2003) J. Phys. D: Appl. Phys., 36, pp. R167Coulthard, I., Degen, I.S., Zhu, Y., Sham, T.K., (1998) Can. J. Phys., 76, p. 1707Wang, C., Yin, H., Dai, S., Sun, S., (2010) Chem. Mater., 22, p. 3277Lopes, G., Vargas, J.M., Sharma, S.K., Béron, F., Pirota, K.R., Knobel, M., Rettori, C., Zysler, R.D., (2010) J. Phys. Chem. C, 114, p. 10148Huang, D.J., Chang, C.F., Jeng, H.-T., Guo, G.Y., Lin, H.-J., Wu, W.B., Ku, H.C., Chen, C.T., (2004) Phys. Rev. Lett., 93, p. 7Hsu, J.-H., Chen, S.-Y., Chang, W.-M., Jian, T.S., Chang, C.-R., Lee, S.-F., (2003) J. Appl. Phys., 93, p. 7702Sharma, S.K., Lopes, G., Vargas, J.M., Socolovsky, L.M., Pirota, K.R., Knobel, M., (2011) J. Appl. Phys., 109, pp. 07B530Sharma, S.K., Vargas, J.M., Pirota, K.R., Kumar, S., Lee, C.G., Knobel, M., (2011) J. Alloys Comp., 509, p. 6414Hoppe, C.E., Rivadulla, F., Lopez-Quintela, M.A., Buján, M.C., Rivas, J., Serantes, D., Baldomir, D., (2008) J. Phys. Chem. C, 112, p. 13099Vargas, J.M., Nunes, W.C., Socolovsky, L.M., Knobel, M., Zanchet, D., (2005) Phys. Rev. B, 72, p. 184428Binns, C., Maher, M.J., Pankhurst, Q.A., Kechrakos, D., Trohidou, K.N., (2002) Phys. Rev. B, 66, p. 184413Roca, A.G., Morales K.O, M.P., Serna, J.C., (2006) Nanotecnology, 17, p. 2783Svergun, D.I., (1992) J. Appl. Crystallogr., 25, p. 49
Interaction Effects In Magnetic Granular Systems
No full textInteractions in magnetic granular systems are difficult to address in real systems. Several experimental results have been obtained along the last 50 years, but few theoretical approaches have been developed to account for these extremely complex systems. A brief review on the role of interactions on the magnetic properties of granular magnetic systems is given, with a focus on a novel approach known as interacting superparamagnetic model. Two different systems are tested, and the results are discussed in terms of such phenomenological model. © 2004 Elsevier B.V. All rights reserved.3541-4 SPEC. ISS.8087Battle, X., Labarta, A., (2002) J. Phys. D: Appl. Phys., 35, pp. R15Skomski, R., (2003) J. Phys.: Condens. Matter, 15, pp. R841Néel, L., (1949) Ann. Geophys., 5, p. 99Bean, C., Livingston, J.D., (1959) J. Appl. Phys., 30, pp. 120SDormann, J.L., Fiorani, D., Tronc, E., (1997) Adv. Chem. Phys., 98, p. 283Ferrari, E.F., Da Silva, F.C.S., Knobel, M., (1997) Phys. Rev. B, 56, p. 6086Jonsson, T., Mattson, J., Djurberg, C., Khan, F.A., Nordlab, P., Svendlindh, P., (1995) Phys. Rev. Lett., 75, p. 4138Djurberg, C., Jonsson, T., Svendlinh, P., Nordlab, P., Hansen, M.F., Bodker, F., Mørup, S., (1997) Phys. Rev. Lett., 79, p. 5154Fiorani, D., Dormann, J.L., Cherkaoui, R., Tronc, E., Lucari, F., D'Orazio, F., Spinu, L., Testa, A.M., (1999) J. Magn. Magn. Mater., 196-197, p. 143Bonetti, E., Del Bianco, L., Fiorani, D., Rinaldi, D., Caciuffo, R., Hernando, A., (1999) Phys. Rev. Lett., 83, p. 2829Skumryev, V., Stoyanov, S., Zhang, Y., Hadjipanayis, G., Givord, D., Nogues, J., (2003) Nature, 423, p. 19Mørup, S., Tronc, E., (1994) Phys. Rev. Lett., 72, p. 3278Allia, P., Coisson, M., Knobel, M., Tiberto, P., Vinai, F., (1999) Phys. Rev. B, 60 (17), p. 12207Kechrakos, D., Trohidou, K.N., (1998) Phys. Rev. B, 58, p. 12169El-Hilo, M., Bsoul, I., Rousan, A., Hudeish, A., (2004) J. Magn. Magn. Mater., 272-276, p. 327. , Part 1Brandl, A.L., Denardin, J.C., Socolovsky, L.M., Knobel, M., Allia, P., (2004) J. Magn. Magn. Mater., 272-276, p. 1526Kechrakos, D., Trohidou, K.N., (2000) Phys. Rev. B, 62, p. 3941Pankhurst, Q.A., Ucko, D.H., Fernández Barquín, L., García Calderón, R., (2003) J. Magn. Magn. Mater., 266, p. 131Allia, P., Knobel, M., Tiberto, P., Vinai, F., (1995) Phys. Rev. B, 52, p. 15398El-Hilo, M., Chantrell, R.W., O'Grady, K., (1998) J. Appl. Phys., 84 (9), p. 5114Bastos, C.S.M., Bahiana, M., Nunes, W.C., Novak, M.A., Altbir, D., Vargas, P., Knobel, M., (2002) Phys. Rev. B, 66. , 214407García-Otero, J., Porto, M., Rivas, J., Bunde, A., (2000) Phys. Rev. Lett., 84, p. 167Porto, M., (2002) J. Appl. Phys., 92, p. 6057De Biasi, E., Zysler, R.D., Ramos, C.A., Romero, H., (2002) Physica B, 320, p. 203Garanin, D.A., Kachkachi, H., (2003) Phys. Rev. Lett., 90, p. 065504Allia, P., Coisson, M., Moya, J., Selvaggini, V., Tiberto, P., Vinai, F., (2003) Phys. Rev. B, 67, p. 174412Hansen, M.S., Koch, C.B., Mørup, S., (2000) Phys. Rev. B, 62, p. 1124Denardin, J.C., Brandl, A.L., Knobel, M., Panissod, P., Pakhomov, A.B., Liu, H., Zhang, X.X., (2002) Phys. Rev. B, 65, p. 64422E.F. Ferrari, A.L. Brandl, R. Piccin, J.C. Denardin, L.M. Socolovsky, M. Knobel, unpublishedHansen, M.F., Mørup, S., (1998) J. Magn. Magn. Mater., 184, p. 262Dormann, J.L., Bessais, L., Fiorani, D., (1998) J. Phys. C, 21, p. 2015Mørup, S., (1994) Eur. Lett., 28 (9), p. 671Allia, P., Coisson, M., Tiberto, P., Vinai, F., Knobel, M., Novak, M.A., Nunes, W.C., (2001) Phys. Rev. B, 64, p. 144420Binns, C., Maher, M.J., Pankhurst, Q.A., Kechcrakos, D., Trohidou, K.N., (2002) Phys. Rev. B, 66, p. 184413Tartaj, P., Gonzalez-Carreño, T., Bomati-Miguel, O., Serna, C.J., Bonville, P., (2004) Phys. Rev. B, 69 (9), p. 94401Poddar, P., Telem-Shafir, T., Fried, T., Markovich, G., (2002) Phys. Rev. B, 66, p. 60403Allia, P., Coisson, M., Knobel, M., Tiberto, P., Vinai, F., (1999) Phys. Rev. B, 60, p. 12207Allia, P., Tiberto, P., Vinai, F., (1997) J. Appl. Phys., 81, p. 4599Morrish, A.H., (1966) The Physical Principles of Magnetism, , Wiley, New YorkKittel, C., (1968) Introduction to Solid State Physics, , Wiley, New YorkSocolovsky, L.M., Denardin, J.C., Brandl, A.L., Knobel, M., Zhang, X.X., (2003) J. Magn. Magn. Mater., 262 (1), p. 102A.L. Brandl, R. Piccin, J.C. Denardin, L.M. Socolovsky, M. Knobel, unpublishedVargas, J.M., Socolovsky, L.M., Goya, G.F., Knobel, M., Zanchet, D., (2003) IEEE Trans. Magn., 39 (5)Mørup, S., Frandsen, C., (2004) Phys. Rev. Lett., 92 (21), p. 217201Mamiya, H., Nakatani, I., Furubayashi, T., Ohnuma, M., (2002) Trans. Magn. Soc. Japan, 2, p. 36Franco, V., Conde, A., (2004) J. Magn. Magn. Mater., 277, p. 18
Effects Of Magnetic Interparticle Coupling On The Blocking Temperature Of Ferromagnetic Nanoparticle Arrays
No full textIn this work we report on the study of the magnetic properties of 2D arrays and 3D dispersions of colloidal iron oxide nanoparticles prepared by Langmuir-Blodgett technique and by dilution in paraffin wax solid solution, respectively. The influence of magnetic interparticle coupling on the superparamagnetic relaxation behavior was investigated by means of DC magnetization measurements. A quantitative analysis of the field dependence of the blocking temperature and the role of the interparticle coupling is presented. We explain our results using a phenomenological model based on the random anisotropy and micromagnetic theories that account for particle coupling effects in the superparamagnetic properties. © 2007 Elsevier B.V. All rights reserved.35308/10/15743747Néel, L., (1949) Ann. Geophysique, 5, p. 99Binns, C., Maher, M.J., (2002) New J. Phys., 4, p. 85Nunes, W.C., Cebollada, F., Knobel, M., Zanchet, D., (2006) J. Appl. Phys., 99, pp. 08N705Vargas, J.M., Nunes, W.C., Socolovsky, L.M., Knobel, M., Zanchet, D., (2005) Phys. Rev. B, 72, p. 184428Dormann, J.L., Fiorani, D., Tronc, E., (1999) J. Magn. Magn. Mat., 202, p. 251Dormann, J.L., Fiorani, D., Tronc, E., (1997) Adv. Chem. Phys., XCVIII, p. 283Hansen, M.F., Mørup, S., (1998) J. Magn. Magn. Mat., 184, p. 2015Allia, P., Coisson, M., Tiberto, P., Vinai, F., Knobel, M., Novak, M.A., Nunes, W.C., (2001) Phys. Rev. B, 64, p. 144420Nunes, W.C., Socolovsky, L.M., Denardin, J.C., Cebollada, F., Brandl, A.L., Knobel, M., (2005) Phys. Rev. B, 72, p. 212413Puntes, V.F., Gorostiza, P., Maruguete, D., Bastus, N.G., Alivisatos, A.P., (2004) Nat. Mater., 3, p. 263Denardin, J.C., Brandl, A.L., Knobel, M., Panissod, P., Pakhomov, A.B., Liu, H., Zhang, X.X., (2002) Phys. Rev. B, 65, p. 64422Wernsdorfer, W., Bonet Orozco, E., Hasselbach, K., Benoit, A., Barbara, B., Demoncy, N., Loiseau, A., Mailly, D., (1997) Phys. Rev. Lett., 78, p. 1791Zhang, Y.D., Budnick, J.I., Hines, W.A., Chien, C.L., Xiao, J.Q., (1998) Appl. Phys. Lett., 72 (16), p. 2053Victora, R.H., (1989) Phys. Rev. Lett., 63, p. 457Kechrakos, D., Trohidou, K.N., (2005) Phys. Rev. B, 71, p. 054416Allia, P., Coisson, M., Knobel, M., Tiberto, P., Vinai, F., (1999) Phys. Rev. B, 60 (12), p. 207Hansen, M.F., Koch, C.B., Morup, S., (2000) Phys. Rev. B, 62, p. 1124Hauschild, J., Elmers, H.J., Gradmann, U., (1998) Phys. Rev. B, 57, pp. R677Alben, R., Becker, J.J., Chi, M.C., (1978) J. Appl. Phys., 49, p. 1653Herzer, G., (2005) J. Magn. Magn. Mat., 294, p. 99Michels, A., Viswanath, R.N., Barker, J.G., Birringer, R., Weissmüller, J., (2003) Phys. Rev. Lett., 91, p. 267204Löffler, J.F., Braun, H.B., Wagner, W., (2000) Phys. Rev. Lett., 85, p. 1990Binns, C., Maher, M.J., Pankhurst, Q.A., Kechrakos, D., Trohidou, K.N., (2002) Phys. Rev. B, 66, p. 184413Chudnovsky, E.M., (1988) J. Appl. Phys., 64, p. 577
Structural, Magnetic, And Mössbauer Characterization Of Size-controlled Iron-iron Oxide Nanoparticles Obtained By Chemical Methods
No full textSize-controlled Fe nanoparticles have been obtained by thermal decomposition of Fe(CO)5 in organic solution, in the presence of ligand molecules. Samples with different sizes, in the 6-12 nm range have been characterized by high-resolution transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, and magnetization measurements. All samples present narrow size distributions and superparamagnetic behavior. The exposition to air leads to the formation of a polycrystalline phase, mainly Fe3O4.395 II26812683Denardin, J.C., Pakhomov, A.B., Brandl, A.L., Socolovsky, L.M., Knobel, M., Krishnan, K.M., Zhang, X.X., Study of magnetic state of granular magnetic alloy with magnetization extraordinary Hall effect and giant magnetoresistance (2003) Appl. Phys. Lett., 82, p. 763Murray, C.B., Kagan, C.R., Bawendi, M.G., Synthesis and characterization of monodisperse nanocrystals and close-packed nanocrystal assemblies (2000) Annu. Rev. Mater. Sci., 30, p. 545Wonterghem, J.V., Mørup, S., Charles, S.W., Wells, S., An investigation of the chemical reactions leading to the formation of ultrafine amourphous FE100-xCx Alloy particles (1988) J. Colloid Interface Sci., 121, p. 545Vanderberghe, R.E., Degrave, E., De Bakker, P.M.A., On the methodology of the analysis of Mössbauer-spectra (1994) Hyp. Int., 83, p. 29Greenwood, N.N., Earnshaw, A., (1984) Chemistry of the Elements, pp. 1254-1255. , Oxford, U.K.: PergamonRockenberger, J., Sher, E.C., Alivisatos, A.P., A new nonhydrolytic single-precursor approach to surfactant-capped nanocrystals of transition metal oxides (1999) J. Amer. Chem. Soc., 121, p. 11595Hyeon, T., Lee, S.S., Park, J., Chung, Y., Na, H.B., Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process (2001) J. Amer. Chem. Soc., 123, p. 12798Bentzon, M.D., Wonterghem, J.V., Mørup, S., Thölén, A., Koch, C.J.W., Ordered aggregates of ultrafine iron oxide particles: 'Super crystals' (1989) Phil. Mag. B, 60, p. 169Theil Kuhn, L., Bojesen, A., Timermann, L., Meedom Nielsen, M., Mørup, S., Structural and magnetic properties of core-shell iron-iron oxide nanoparticles (2002) J. Phys.: Condens. Mater, 14, p. 1355
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