Phase transitions of anisotropic and exchange origins in TmFe.sub.5./sub.Al.sub.7./sub

0432032 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Gorbunov, Denis - Yasin, S. - Andreev, Alexander V. - Mushnikov, N. V. - Rosenfeld, E.V. - Skourski, Y. - Zherlitsyn, S. - Wosnitza, J.
Phase transitions of anisotropic and exchange origins in TmFe₅Al₇
Physical Review. B. Roč. 89, č. 21 (2014), "214417-1"-"214417-9". ISSN 1098-0121
Grant CEP: GA ČR GAP204/12/0150
Grant ostatní: AVČR(CZ) M100101203
Institucionální podpora: RVO:68378271
Klíčová slova: rare-earth intermetallics * ferrimagnetism * magnetic anisotropy * spin-reorientation transition * high magnetic fields * field-induced transition
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.736, rok: 2014

Magnetization and sound propagation reveal a number of unusual spontaneous and field-induced transformations in ferrimagnetic TmFe5Al7 (TC =193 K). The Tm sublattice provides uniaxial magnetic anisotropy, whereas the Fe sublattice favors an easy-plane anisotropy. A competition between them results in a first-order spin reorientation (SR) at 64 K. The transition is preceded by a first-order magnetization process of type II along the hard axis. The intersublattice Tm-Fe exchange interaction is weakened at SR, the spontaneous magnetic moment disappears, and the ferrimagnetic state changes to antiferromagnetic. With increasing temperature, the strength of the Tm-Fe exchange is recovered, and the ferrimagnetism is restored at 82 K through another first-order phase transformation. Below 40 K, a first-order field-induced transition occurs for a magnetic field applied along the easy [001] axis towards the forced ferromagnetic state observed above 30 T.
Trvalý link: http://hdl.handle.net/11104/0236525