Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Spin dependent Transport Phenomena

MA 29.5: Talk

Tuesday, March 21, 2017, 15:00–15:15, HSZ 403

Exchange and spin-orbit induced phenomena in diluted (Ga,Mn)As from first principles — •Josef Kudrnovsky¹, Vaclav Drchal¹, and Ilja Turek² — ¹Institute of Physics AS CR, Prague, Czech Republic — ²Institute of Physics of Materials AS CR, Brno, Czech Republic

Physical properties induced by exchange interactions (Curie temperature and spin stiffness) and spin-orbit coupling (anomalous Hall effect, anisotropic magnetoresistance, and Gilbert damping) in the diluted (Ga,Mn)As ferromagnetic semiconductor are studied from first principles. Recently developed Kubo-Bastin transport theory and nonlocal torque operator formulation of the Gilbert damping as formulated in the tight-binding linear muffin-tin orbital method are used. The first-principles Liechtenstein mapping is employed to construct effective Heisenberg Hamiltonian and to estimate Curie temperature and spin stiffness in the real-space random-phase approximation which takes into account the effect of magnetic percolation. Good agreement of calculated physical quantities with experiments for well-annealed samples containing only a small amount of compensating defects is obtained. Their possible effect will be briefly discussed.