Control of magnetization reversal process by light illumination in ferromagnetic semiconductor heterostructure p-(In, Mn)As/GaSb

The reduction in coercive force by light illumination has been found in ferromagnetic semiconductor heterostructure $\mathrm{p-}\mathrm{(In, Mn)As/GaSb}$ prepared by molecular-beam epitaxy. Enhanced ferromagnetic coupling between Mn ions, arising from excess photogenerated holes, reduces the domain wall energy and changes the magnetization hysteresis characteristics. The value of coercive force returns to the original value when excess holes recombine with trapped electrons.