On the nonequilibrium light-induced diamagnetism
Institute of Physics, University of Rzeszów
Al. Rejtana 16A, 35-310 Rzeszów, Poland
Corresponding author: a email@example.com
Published online: 15 July 2001
A new interpretation of light-induced magnetization changes of a magnetic semiconductor, manganese arsenide (MnAs), observed by the authors of references [1,2], is proposed in this paper. Contrary to references [1,2], where the results of experiments were interpreted as the observation of light-induced phase transition, here we propose a completely different approach. It suggests that at least far from the vicinity of Tc, there are no real magnetization changes as in case of phase transition, but there are changes of the magnetic flux threading the MnAs-sample. These changes are due to non-equilibrium light-induced diamagnetic moments of quasi-free electrons of narrow d-subbands of the MnAs-conduction band. The other aspects of the experiments of [1,2] are also discussed and some similarity between this effect and the orbital diamgnetism due to persistent currents in mesoscopic structures is emphasised.
PACS: 75.50.Pp – Magnetic semiconductors / 75.20.Ck – Nonmetals
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001