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

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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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