Cyclotron Resonance in Ferromagnetic InMnAs/(Al,Ga)Sb Heterostructures

G. A. Khodaparast; J. Kono; Y. H. Matsuda; S. Ikeda; N. Miura; T. Slupinski; A. Oiwa; H. Munekata; Y. Sun; F. V. Kyrychenko; G. D. Sanders; C. J. Stanton

arXiv · cond-mat/0307087

Cyclotron Resonance in Ferromagnetic InMnAs/(Al,Ga)Sb Heterostructures

G. A. Khodaparast·J. Kono·Y. H. Matsuda·S. Ikeda·N. Miura·T. Slupinski·A. Oiwa·H. Munekata·Y. Sun·F. V. Kyrychenko·G. D. Sanders·C. J. Stanton

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Abstract

We report the observation of hole cyclotron resonance (CR) in InMnAs/(Al,Ga)Sb heterostructures in a wide temperature range covering both the paramagnetic and ferromagnetic phases. We observed two pronounced resonances that exhibit drastic changes in position, linewidth, and intensity at a temperature higher than the Curie temperature, indicating possible local magnetic ordering or clustering. We attribute the two resonances to the fundamental CR transitions expected for delocalized valence-band holes in the quantum limt. Using an 8-band {\bf k$\cdot$p} model, which incorporates ferromagnetism within a mean-field approximation, we show that the temperature-dependent CR peak shift is a direct measure of the carrier-Mn exchange interaction. Significant line narrowing was observed at low temperatures, which we interpret as the suppression of localized spin fluctuations.

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G. A. Khodaparast, J. Kono, Y. H. Matsuda, S. Ikeda, N. Miura, T. Slupinski, A. Oiwa, H. Munekata, Y. Sun, F. V. Kyrychenko, G. D. Sanders, C. J. Stanton. 2003-07-03. Cyclotron Resonance in Ferromagnetic InMnAs/(Al,Ga)Sb Heterostructures. https://arxiv.org/abs/cond-mat/0307087

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