Manganese spin relaxation in ferromagnetic (Ga,Mn)As

In this paper the theory of spin relaxation 3d⁵ manganese electrons in (Ga,Mn)As is presented, including the ferromagnetic and paramagnetic phases. The gallium arsenide doped with manganese holes manifest themselves in two ways, as the carriers cause magnetic interaction between the manganese centers, and as a channel for their spin relaxation. The strong spin-orbit interaction of the holes leads to a short time of spin relaxation, and the exchange interaction with 3d⁵ electrons of manganese causes its fast spin relaxation. This mechanism of spin relaxation is dominated by manganese in the ferromagnetic phase, and in the paramagnetic phase the main mechanism of spin relaxation of Mn is caused by hole spin fluctuations.

PACS: 75.50.Pp Magnetic semiconductors;
PACS: 75.78.–n Magnetization dynamics.

Key words: diluted magnetic semiconductors, spin relaxation, ferromagnetic resonance.

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