Magnetic domain structure and magnetization reversal in (311)B Ga0.91Mn0.09As films

摘要: We have used scanning Hall probe microscopy to image domain structures and magnetization reversal in optimally annealed Ga0.91Mn0.09As films grown on (311)B GaAs substrates. Unmagnetized exhibit a disordered mazelike structure consistent with composite state of regions along [0,1,0] [0,0,1] out-of-plane easy axes. The characteristic stripe width ∼3μm exhibits almost no temperature dependence the range 5–90K, recent theoretical predictions, while peak fields drop linearly increasing temperature. With an applied field perpendicular zero-field-cooled film proceeds by motion rather ordered stripe-shaped domains which form preferentially one [0,1,0]∕[0,0,1] Surprisingly, stripelike are not clearly observed during from magnetized state, appears involve propagation magnetic “bubbles.” Weak contrast points th...