ThMn.sub.12./sub.-type phases for magnets with low rare-earth content: crystal-field analysis of the full magnetization process

0501223 - FZÚ 2019 RIV GB eng J - Journal Article
Tereshina, I. S. - Kostyuchenko, N.V. - Tereshina-Chitrova, Evgenia - Skourski, Y. - Doerr, M. - Pelevin, I.A. - Zvezdin, A. K. - Paukov, M. - Havela, L. - Drulis, H.
ThMn₁₂-type phases for magnets with low rare-earth content: crystal-field analysis of the full magnetization process.
Scientific Reports. Roč. 8, Feb (2018), s. 1-6, č. článku 3595. ISSN 2045-2322. E-ISSN 2045-2322
Institutional support: RVO:68378271
Keywords : permanent magnets * crystal electric field * high-field magnetization * rare earth-iron compounds
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.011, year: 2018

Recent increase in price of rare earths (R) has pushed the industry to seek ways to reduce the R-content in the hard magnetic materials. For this reason strong magnets with the ThMn12 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 TmFe11Ti-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.
Permanent Link: http://hdl.handle.net/11104/0293217