Abstract
The exchange coupling of Fe centers in GaAs crystals is studied by electron spin resonance (ESR). Transitions to a superparamagnetic state and to an impurity ferromagnetism domain are analyzed. A study of a system of single-domain magnetically ordered regions in GaAs:Fe with the transition to a ferromagnetic state occurring at the temperature T C1 = 460 K is described. It is shown that impurity ferromagnetism with a transition temperature T C2 of 60 K in a disordered system of Fe centers randomly distributed among superparamagnetic regions exists in GaAs:Fe.
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Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 39, No. 5, 2005, pp. 521–527.
Original Russian Text Copyright © 2005 by Popov, Sobolevski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Apushkinski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Savel’ev.
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Popov, B.P., Sobolevskii, V.K., Apushkinskii, E.G. et al. Magnetic ordering effects in heavily doped GaAs:Fe crystals. Semiconductors 39, 493–498 (2005). https://doi.org/10.1134/1.1923553
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DOI: https://doi.org/10.1134/1.1923553