ThMn12-type phases for magnets with low rare-earth content: Crystal-field analysis of the full magnetization process
Year: 2018
Type: article
Abstract: 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 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.
Source: Scientific Reports
Institutions: Lomonosov Moscow State University, TU Wien, Moscow Institute of Physics and Technology, FZU - Institute of Physics of the Czech Academy of Sciences, Helmholtz-Zentrum Dresden-Rossendorf, Dresden High Magnetic Field Laboratory, Technische Universität Dresden, Baikov Institute of Metallurgy and Materials Science, National Research University Higher School of Economics, Prokhorov General Physics Institute, Immanuel Kant Baltic Federal University, Charles University, Włodzimierz Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
Awards: G762019869, G8044943981, G8527880048
OpenAlex ID: W2805881371