Diop, L. V. B. ; Kuz'min, M. D. ; Skokov, K. P. ; Karpenkov, D. Yu. ; Gutfleisch, O. (2016):
Magnetic anisotropy ofSm2Fe17single crystals.
In: Physical Review B, 94 (14), p. 144413. American Physical Society, ISSN 2469-9950,
[Article]
Abstract
The previously accepted notion that the spontaneous magnetization of Sm2Fe17 lies in the basal plane of the crystal is true only approximately, and then only around room temperature. At low temperatures the magnetization, whose orientation is not fixed by the symmetry, is found to deviate from the basal plane by as much as 10 degrees. The threefold symmetry axis is a hard direction; to magnetize the crystal in this direction, a magnetic field of about 9 T is required. The hard-axis magnetization arrives at saturation discontinuously, by way of a first-order phase transition. The behavior is a general one for trigonal ferromagnets where K-1 < 0 and the leading trigonal anisotropy constant is nonzero, K-2' not equal 0. Although of universal occurrence, the first-order transition is only visible at low temperatures, where it is accompanied by a magnetization anomaly of sufficient size.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Diop, L. V. B. ; Kuz'min, M. D. ; Skokov, K. P. ; Karpenkov, D. Yu. ; Gutfleisch, O. |
| Title: | Magnetic anisotropy ofSm2Fe17single crystals |
| Language: | English |
| Abstract: | The previously accepted notion that the spontaneous magnetization of Sm2Fe17 lies in the basal plane of the crystal is true only approximately, and then only around room temperature. At low temperatures the magnetization, whose orientation is not fixed by the symmetry, is found to deviate from the basal plane by as much as 10 degrees. The threefold symmetry axis is a hard direction; to magnetize the crystal in this direction, a magnetic field of about 9 T is required. The hard-axis magnetization arrives at saturation discontinuously, by way of a first-order phase transition. The behavior is a general one for trigonal ferromagnets where K-1 < 0 and the leading trigonal anisotropy constant is nonzero, K-2' not equal 0. Although of universal occurrence, the first-order transition is only visible at low temperatures, where it is accompanied by a magnetization anomaly of sufficient size. |
| Journal or Publication Title: | Physical Review B |
| Volume of the journal: | 94 |
| Issue Number: | 14 |
| Publisher: | American Physical Society |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 18 Nov 2016 10:07 |
| URL / URN: | http://dx.doi.org/10.1103/PhysRevB.94.144413 |
| Identification Number: | doi:10.1103/PhysRevB.94.144413 |
| PPN: | |
| Funders: | The financial support by the German federal state of Hessen through its excellence programme LOEWE "RESPONSE" is acknowledged. |
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