Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type / Teplykh A.E., Chukalkin Yu.G., Lee S., Bogdanov S.G., Kudrevatykh N.V., Rosenfeld E.V., Skryabin Yu.N., Choi Y., Andreev A.V., Pirogov A.N. // Journal of Alloys and Compounds. - 2013. - V. 581, l. . - P. 423-430.

ISSN:
09258388
Type:
Article
Abstract:
Magnetic susceptibility, magnetization and neutron diffraction measurements have been performed to study structure and magnetic states of crystalline and amorphous Nd2Fe14B and Er2Fe14B alloys. In the crystalline state there exists a large (about 20%) anisotropy of Er-sublattice magnetization. Values of the magnetic anisotropy constant of Er ions and the Er-Fe exchange-coupling parameter were estimated using temperature dependence of the Er-and Fe-sublattice magnetizations. Amorphous state of the samples was obtained by irradiation of fast (Eeff≥1MeV) neutrons with a fluence up to the 1.2 × 1020 n/cm-2 at 340 K. It is shown that antiferromagnetic coupling between the rare-earth and iron spins is kept in the amorphous state. Amorphization of the samples is found to result in reduction of the Curie temperature (TC) by about 200 K and almost total absence of coercivity. We suggest that the strong decrease of TC is a consequence of enhancement of negative Fe-Fe interactions as a result of dispersion of interatomic distances, which is a characteristic feature of the amorphous state. © 2013 Elsevier B.V. All rights reserved.
Author keywords:
Amorphous state; Neutron irradiation; Neutron powder diffraction; Rare-earth transition-metal compounds
Index keywords:
Amorphous state; Antiferromagnetic coupling; Crystalline state; Inter-atomic distances; Magnetic anisotropy constant; Neutron diffraction measurements; Rare-earth transition-metal compounds; Temperatu
DOI:
10.1016/j.jallcom.2013.07.103
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Affiliations Institute of Metal Physics of Ural, Division of Russian Academy Sciences, Ekaterinburg 620990, Russian Federation; HANARO, Korea Atomic Energy Research Institute, Daejeon 305-600, South Korea; Ural Federal University, Ekaterinburg 620083, Russian Federation; Department of Materials Science and Engineering, Dankook University, Cheonan 330-714, South Korea; Institute of Physics, Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Author Keywords Amorphous state; Neutron irradiation; Neutron powder diffraction; Rare-earth transition-metal compounds
Funding Details P204/12/0150, Czech Science Foundation
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Correspondence Address Andreev, A.V.; Institute of Physics, Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic; email: a.andreev@seznam.cz
CODEN JALCE
Language of Original Document English
Abbreviated Source Title J Alloys Compd
Source Scopus