Open AccessThMn12-type phases for magnets with low rare-earth content: Crystal-field analysis of the full magnetization process
Author(s) -
И. С. Терешина,
N. V. Kostyuchenko,
E. A. Tereshina-Chitrova,
Y. Skourski,
Markus Doerr,
Ivan A. Pelevin,
A. K. Zvezdin,
M. Paukov,
L. Havela,
H. Drulis
Publication year - 2018
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-018-21756-5
Subject(s) - ferrimagnetism , magnetization , magnet , ferromagnetism , rare earth , materials science , coercivity , condensed matter physics , rare earth element , magnetic field , crystallography , chemistry , metallurgy , physics , quantum mechanics
Rare-earth (R)-iron alloys are a backbone of permanent magnets. Recent increase in price of rare earths has pushed the industry to seek ways to reduce the R-content in the hard magnetic materials. For this reason strong magnets with the ThMn 12 type of structure came into focus. Functional properties of R(Fe,T) 12 (T-element stabilizes the structure) compounds or their interstitially modified derivatives, R(Fe,T) 12 -X (X is an atom of hydrogen or nitrogen) are determined by the crystal-electric-field (CEF) and exchange interaction (EI) parameters. We have calculated the parameters using high-field magnetization data. We choose the ferrimagnetic Tm-containing compounds, which are most sensitive to magnetic field and demonstrate that TmFe 11 Ti-H reaches the ferromagnetic state in the magnetic field of 52 T. Knowledge of exact CEF and EI parameters and their variation in the compounds modified by the interstitial atoms is a cornerstone of the quest for hard magnetic materials with low rare-earth content.