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Origin of field-induced discontinuous phase transitions in Nd2Fe17

Diop, L. V. B. and Kuz'min, M. D. and Skokov, K. P. and Skourski, Y. and Gutfleisch, O. (2018):
Origin of field-induced discontinuous phase transitions in Nd2Fe17.
In: Physical Review B, American Physical Society, pp. 054406, 97, (5), ISSN 2469-9950, DOI: 10.1103/PhysRevB.97.054406, [Online-Edition: https://doi.org/10.1103/PhysRevB.97.054406],
[Article]

Abstract

Magnetic properties of a trigonal ferromagnet Nd2Fe17 have been studied on single crystals in steady (14 T) and pulsed (32 T) magnetic fields. The easy-magnetization direction lies close to the [120] axis, deviating from the basal plane by 2.9 degrees (at T = 5K). Of particular interest is the low-temperature magnetization process along the high-symmetry axis [001], which is the hard direction. This process is discontinuous and involves two first-order phase transitions (FOMPs). One of them (at 20 T) is a symmetry FOMP similar to that observed in Sm2Fe17. The second transition (at 10.4 T) is unusual: as the magnetization turns abruptly toward the applied field, it also changes its azimuthal orientation (the angle phi) by 60 degrees. Both transitions can be reasonably accounted for by the presence of a significant sixth-order trigonal anisotropy term.

Item Type: Article
Erschienen: 2018
Creators: Diop, L. V. B. and Kuz'min, M. D. and Skokov, K. P. and Skourski, Y. and Gutfleisch, O.
Title: Origin of field-induced discontinuous phase transitions in Nd2Fe17
Language: English
Abstract:

Magnetic properties of a trigonal ferromagnet Nd2Fe17 have been studied on single crystals in steady (14 T) and pulsed (32 T) magnetic fields. The easy-magnetization direction lies close to the [120] axis, deviating from the basal plane by 2.9 degrees (at T = 5K). Of particular interest is the low-temperature magnetization process along the high-symmetry axis [001], which is the hard direction. This process is discontinuous and involves two first-order phase transitions (FOMPs). One of them (at 20 T) is a symmetry FOMP similar to that observed in Sm2Fe17. The second transition (at 10.4 T) is unusual: as the magnetization turns abruptly toward the applied field, it also changes its azimuthal orientation (the angle phi) by 60 degrees. Both transitions can be reasonably accounted for by the presence of a significant sixth-order trigonal anisotropy term.

Journal or Publication Title: Physical Review B
Volume: 97
Number: 5
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences
Date Deposited: 12 Mar 2018 09:58
DOI: 10.1103/PhysRevB.97.054406
Official URL: https://doi.org/10.1103/PhysRevB.97.054406
Funders: The financial support by the German federal state of Hessen through its excellence program LOEWE "RESPONSE" is acknowledged., We also acknowledge the support of the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL).
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