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/EISSN:

0925-8388 / нет данных

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 (E-eff >= 1 MeV) neutrons with a fluence up to the 1.2 x 10(20) 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 (T-C) by about 200 K and almost total absence of coercivity. We suggest that the strong decrease of T-C 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. (C) 2013 Elsevier B. V. All rights reserved.

Author keywords:

Rare-earth transition-metal compounds; Neutron powder diffraction; Neutron irradiation; Amorphous state B PERMANENT-MAGNETS; FE-B; MAGNETOCRYSTALLINE ANISOTROPY; NEUTRON-IRRADIATION; THERMAL-EXPANSION; RADIATION; PRESSURE; INTERMETALLICS; DEFORMATION; DIFFRACTION

DOI:

10.1016/j.jallcom.2013.07.103

Web of Science ID:

ISI:000324823000071

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC 25
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
Keywords-Plus	B PERMANENT-MAGNETS; FE-B; MAGNETOCRYSTALLINE ANISOTROPY; NEUTRON-IRRADIATION; THERMAL-EXPANSION; RADIATION; PRESSURE; INTERMETALLICS; DEFORMATION; DIFFRACTION
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	a.andreev@seznam.cz
ResearcherID-Numbers	Pirogov, Alexander/K-8115-2013 Andreev, Alexander/B-6057-2011 Yurii, Chukalkin/J-7670-2013 Skryabin, Yuri/J-4786-2013 Bogdanov, Savva/K-1613-2013 Rosenfeld, Eugene/K-6183-2013
ORCID-Numbers	Pirogov, Alexander/0000-0001-7321-1245 Yurii, Chukalkin/0000-0001-5200-479X Skryabin, Yuri/0000-0001-7503-5425 Bogdanov, Savva/0000-0003-2327-1180 Rosenfeld, Eugene/0000-0002-8020-1288
Funding-Acknowledgement	RAS Program {[}01.2.006 13394]; RAS {[}12-02-12065-DBR\_M, 12-Pi-2-1019, 12-Pi-2-1041]; RBRF {[}12-02-00864]; MOST {[}2012R1A1A4A01014953]; Czech Science Foundation {[}Prant P204/12/0150]
Funding-Text	The work was done within RAS Program (Project No. 01.2.006 13394) and with partial support of Projects 12-02-12065-DBR\_M, ``Quant mesoscopic and disordered structures{''} of UD of RAS Nos. 12-Pi-2-1019 and 12-Pi-2-1041 and Project of RBRF No. 12-02-00864. One (Y. Choi) of us would like to thank MOST (Grant No. 2012R1A1A4A01014953). A.V.A. thanks support from the Czech Science Foundation (Prant P204/12/0150).
Number-of-Cited-References	36
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	51
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	223QS