Critical Transitions in Rare-Earths Magnets of (R,R')2Fe14B Type

We demonstrate the peculiarities of the magnetization process in the ferrimagnetic intermetallic compounds of the (\text{R,R}^{\prime})_{2}\text{Fe}_{14}\mathrm{B} -type, their hydrides, as well as complex modified rare earth compounds (\text{R,R}^{\prime})_{2}\text{Fe}_{14}\mathrm{B} (R = Nd, Gd, D...

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Published in2024 IEEE International Magnetic Conference - Short papers (INTERMAG Short papers) pp. 1 - 2
Main Authors Kostyuchenko, N.V., Plokhov, D.I., Kudasov, Yu.B., Tereshina, I.S., Surdin, O.M., Zvezdin, A.K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 05.05.2024
Subjects
complex modified materials
Compounds
critical fields
exchange coupling
hard magnetic materials
Intermetallic
Magnetic fields
Magnetization processes
Magnets
R-Feexchange
rare-earth intermetallics
ultrahigh magnetic fields
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Summary:We demonstrate the peculiarities of the magnetization process in the ferrimagnetic intermetallic compounds of the (\text{R,R}^{\prime})_{2}\text{Fe}_{14}\mathrm{B} -type, their hydrides, as well as complex modified rare earth compounds (\text{R,R}^{\prime})_{2}\text{Fe}_{14}\mathrm{B} (R = Nd, Gd, Dy, Ho). They have been studied theoretically and experimentally in ultrahigh magnetic fields. We observe phase transition induced by external ultrahigh magnetic fields (up to 200 T) and also describe the magnetization process analytically (in terms of critical transition fields) and numerically. In this work, the first and second critical fields of the field-induced magnetic transitions, \mathrm{H}_{\mathrm{c}1} and \mathrm{H}_{\mathrm{c}2} , were estimated. Critical field \mathrm{H}_{\mathrm{c}2} predicting the place of transition to the forced-ferromagnetic state was estimated for the first time for various intermetallic compounds.
DOI:10.1109/INTERMAGShortPapers61879.2024.10576759