Drastic reduction of the R-Fe exchange in interstitially modified (Nd,Ho).sub.2./sub.Fe.sub.14./sub.B compounds probed by megagauss magnetic fields

0543817 - FZÚ 2022 RIV US eng J - Journal Article
Kostyuchenko, N.V. - Tereshina, I. S. - Tereshina-Chitrova, Evgenia - Ivanov, L.A. - Paukov, M. - Gorbunov, D.I. - Andreev, Alexander V. - Doerr, M. - Politova, G.A. - Zvezdin, A. K. - Veselova, S.V. - Pyatakov, A.P. - Miyata, A. - Drachenko, O. - Portugall, O.
Drastic reduction of the R-Fe exchange in interstitially modified (Nd,Ho)₂Fe₁₄B compounds probed by megagauss magnetic fields.
Physical Review Materials. Roč. 5, July (2021), č. článku 074404. ISSN 2475-9953. E-ISSN 2475-9953
R&D Projects: GA ČR(CZ) GA19-00925S; GA MŠMT(CZ) LM2018096
Institutional support: RVO:68378271
Keywords : rare-earth intermetallics * ferrimagnetism * ultra-high magnetic fields * field-induced transtions
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.980, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevMaterials.5.074404

In this paper, the full magnetization process demonstrated by the series of ferrimagnetic intermetallic compounds (Nd,Ho)2Fe14B and Ho2Fe14B and their hydrides with the maximum possible hydrogen content (for the given crystal structure type) is studied theoretically and experimentally using megagauss magnetic fields. We observe field-induced phase transitions from the initial ferrimagnetic to the forced-ferromagnetic state in magnetic fields up to 130 T and describe the magnetization process analytically. We find a drastic decrease of the critical transition fields in the hydrogenated compounds. This is due to extremely strong, nearly twofold reduction of the R-Fe intersublattice exchange interaction because of the combined substitution and hydrogenation effects. A comparative analysis of the magnetization behavior for the system Ho2Fe17-H is also performed.
Permanent Link: http://hdl.handle.net/11104/0320937