Magnetic Properties of Epitaxial Fe/(Ga,Mn)As Hybrids
K. Kalbarczyk, K. Dziatkowski, J. Szczytko, J. Gosk, M. Tokarczyk, G. Kowalski, A. Twardowski
Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
W. Bednarski, A. Ostrowski, S. Waplak, J. Martinek
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
X. Liu and J.K. Furdyna
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
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Thin-film structures composed of two kinds of ferromagnetic material - metallic Fe and semiconducting (Ga,Mn)As - were investigated by means of SQUID magnetometry and ferromagnetic resonance spectroscopy. Dependence of remnant magnetic moment on temperature showed unexpected anisotropic features when recorded along two orthogonal in-plane directions. For one of these orientations, the change in sign of the slope of m(T) curve at the Curie point of (Ga,Mn)As was observed, while for the other, an analogous m(T) curve retained monotonic character. Based on the comparison with ferromagnetic resonance data, the apparent non-monotonicity was attributed to the temperature-induced change of balance between the external magnetic field and uniaxial magnetic anisotropy in the plane of Fe layer.

DOI: 10.12693/APhysPolA.124.873
PACS numbers: 75.75.-c, 75.30.Gw, 75.50.Pp, 75.50.Bb