Interplay of Magnetic Anisotropies in Epitaxial Ferromagnetic Hybrids of Fe and (Ga,Mn)As

K. Dziatkowski; K. Kalbarczyk; J. Szczytko; J. Gosk; M. Tokarczyk; G. Kowalski; A. Twardowski; W. Bednarski; A. Ostrowski; S. Waplak; J. Martinek; X. Liu; J. K. Furdyna

doi:10.3379/msjmag.1402R012

K. Dziatkowski, K. Kalbarczyk, J. Szczytko, J. Gosk, M. Tokarczyk, G. Kowalski, A. Twardowski, W. Bednarski, A. Ostrowski, S. Waplak, J. Martinek, X. Liu, J. K. Furdyna

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Keywords: magnetic anisotropy, ferromagnetic resonance, ferromagnetic semiconductor, dilute magnetic semiconductor, iron, hybrid heterostructure

JOURNAL FREE ACCESS

2014 Volume 38 Issue 3-2 Pages 111-114

DOI https://doi.org/10.3379/msjmag.1402R012

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Abstract

The combined magnetometric and microwave spectroscopy study of Fe/(Ga,Mn)As hybrids is reported. Temperature-dependent remnant magnetization data revealed unexpected non-monotonic behavior when measured along one of the in-plane crystallographic directions of (Ga,Mn)As, with a slope-sign change at the Curie point of the ferromagnetic semiconductor. Subsequent ferromagnetic resonance measurements presented uniaxial and cubic+uniaxial symmetries of in-plane magnetic anisotropy in Fe and (Ga,Mn)As, respectively. The apparent non-monotonicity of magnetization was explained as a manifestation of competition between the applied magnetic field and temperature-altered magnetic anisotropy in ferromagnetic metal layer.

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