We have carried out the planar Hall effect measurement on two different sizes of Hall bar devices fabricated from GaMnAs ferromagnetic films. The detailed information on the magnetic anisotropy properties including the shape anisotropy field were obtained from the angular dependence of planar Hall resistance. The shape anisotropy field per magnetization in the device with 10 μm channel width was about 39 G. Though the value of shape anisotropy is small, it affects the magnetization reversal processes of the 10 μm Hall device by showing steplike feature in the angular dependence of switching fields.
ASJC Scopus subject areas
- Physics and Astronomy(all)