Figure 3
Angular dependence of PHR measured with two opposite current directions for devices A (panel a) and B (panel b) as a 23 Oe field is rotated. Open symbols are for data obtained with CW rotation; solid symbols for CCW rotation; circles correspond to positive current; squares to negative current. Directions of magnetization in GaMnAs and Fe layers are shown with red solid and blue open arrows at corresponding positions. The data show clear hystereses between positive and negative currents at φ H  = 0°and 180°, where magnetization of the GaMnAs layer makes an abrupt transition (see regions shaded in red). Directions of the SO-fields originating from broken inversion symmetry of the GaMnAs crystal structure and from strain are shown in the left and right insets in the top panel. Solid arrows (red and blue) in the insets represent the SO fields, and dotted (black) arrows show the current directions.
