41 research outputs found
Investigation of time dependent effects in the magnetization processes of YxSm(1-x)Co3Cu2 alloys
No full text
Magnetism of mixed valence (LaSr) hexaferrites
No full textThe electronic structure of LaxSr1-xFe12O19 (x=0, 0.25, 0.5, 0.75, 1) hexaferrite is calculated using the density functional theory and generalized gradient approximation (GGA). The GGA+U method is used to improve the description of strongly correlated 3d electrons of Fe. The ‘virtual crystal’ approach is employed for the fractional x, its applicability is checked for x=0.5 by comparing it with the supercell method. The electronic charges introduced by the La substitution show no significant preference for any of the iron sublattices. The magnetic moment decreases linearly with the increasing La content in agreement with the experiment. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005
International comparison of measurements of hard magnets with the Vibrating Sample Magnetometer
No full textOn The Nature Of The Disordered Microstructure In Sm(co,cu)5 Alloys With Increasing Cu Content
No full textX-ray diffraction and transmission electron microscopy (TEM) experiments were performed in heat-treated Sm(Co,Cu)5 samples with different Co/Cu content. The major phase observed in the diffraction patterns exhibits a hexagonal CaCu5 type structure in all the studied compositions. The behavior of the diffraction profiles, as function of the Cu content, is believed to be due to an inhomogeneous distribution of Co and Cu through out the samples. Heavily planar faulted regions have been observed by means of TEM and are also associated with Sm and Co rich phases within the matrix. A CaCu5 type structure with local Sm rich regions seems to be responsible for the observed magnetic behavior. © 2006 Elsevier B.V. All rights reserved.42901/02/15343347Jaccarino, V., Walker, L.R., (1965) Phys. Rev. Lett., 15, p. 258Lectard, E., Allibert, C.H., Ballou, R., (1994) J. Appl. Phys., 75 (10)Kahn, Y., (1974) Phys. Stat. Sol. (a), 23, pp. K151Nesbitt, E.A., Wernick, J.H., Corenzwit, E., (1959) J. Appl. Phys., 30, p. 365Katayama, T., Shibata, T., (1973) J. Appl. Phys., 12, p. 319Kamino, K., Kimura, Y., Suzuki, T., Itayama, Y., (1973) Trans. Jpn. Inst. Met., 14, p. 135Buschow, K.H.J., Brouha, M., (1976) J. Appl. Phys., 47, p. 1653Mitchell, R.K., McCurrie, R.A., (1986) J. Appl. Phys., 12, p. 4113Barbara, B., Uehara, M., (1976) IEEE Trans. Magn. MAG-12, p. 997Estévez-Rams, E., Fidler, J., Pentón, A., Téllez-Blanco, J.C., Turtelli, R.S., Groessinger, R., (1999) J. Alloys Compd., 283, pp. 327-330Estévez-Rams, E., Pentón, A., Novo, S., Fidler, J., Téllez-Blanco, J.C., Groessinger, R., (1999) J. Alloys Compd., 283, pp. 289-295Estévez-Rams, E., Fidler, J., Pentón, A., Valor-Red, A., Téllez-Blanco, J.C., Turtelli, R.S., Groessinger, R., (1999) J. Magn. Magn. Mater., 195, pp. 595-600Zhang, Y., Gabay, A., Wang, Y., Hadjipanayis, G.C., (2004) J. Magn. Magn. Mater., 272-276, pp. e1899-e1900de Campos, M.F., Okamura, H., Hadjipanayis, G.C., Rofrigues, D., Landgraf, F.J.G., Neiva, A.C., Romero, S.A., Missell, F.P., (2004) J. Alloys Compd., 368, pp. 304-307Gjoka, M., Kalogirou, O., Sarafidis, C., Niarchos, D., Hadjipanayis, G.C., (2002) J. Magn. Magn. Mater., 242-245, pp. 844-846Yu, H.-C., Li, J.-Q., Bei, Y.-Q., Zhou, Y.-Q., Zhang, J., Zhang, W.-Y., Shen, B.-G., (2004) J. Electron. Microsc., 53 (1), pp. 37-42Allen, C.W., Liao, K.C., Miller, E., (1977) J. Less-Comm. Met., 52, p. 10
