Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 57: Thin Films: Magnetic Coupling Phenomena / Exchange Bias and Magnetic Anisotropy

MA 57.1: Vortrag

Freitag, 13. März 2026, 09:30–09:45, POT/0112

Angle-dependent magnetization reversal in perpendicular-anisotropy garnet films — •Senyin Zhu, Hanxu Zhang, Xianjie Wang, and Bo Song — Harbin Institute of Technology, Harbin 150001, China

Rare-earth-doped iron garnet (RIG) films with perpendicular magnetic anisotropy (PMA) offer a useful platform for studying angle-dependent magnetization reversal. The hysteresis behavior of Bi/La-doped thin RIG films was measured for magnetic-field orientations ranging from the in-plane direction, defined as 0°, to the out-of-plane direction at 90° and further up to 140°, enabling the identification of two distinct reversal regimes. For field orientations close to the film plane (0-50°), the reversal is governed by a continuous rotation of the magnetization, consistent with a uniform-state instability leading to a second-order phase transition. For field orientations close to the film normal (50-140°), the reversal is driven by domain nucleation with irreversible jumps, which is the characteristic signature of a first-order phase transition. The reversal mechanisms are consistent with the rotation- and nucleation-dominated processes known from metallic films.[1,2] In garnet film systems, however, the angular ranges at which these processes occur are shifted with respect to metallic films, most likely due to their stress-controlled perpendicular anisotropy and the larger exchange lengths.[1] O. Hovorka, A. Berger, and L. Fallarino, Phys. Rev. B 94, 064408 (2016). [2] R. Salikhov, F. Samad, L. Fallarino et al., Phys. Rev. B 110, 024417 (2024).

Keywords: Perpendicular magnetic anisotropy; magnetization reversal; rare-earth iron garnet