We theoretically investigate the interplay between local lattice distortions around $rm{Mn^{2+}}$ ion impurity and the ions magnetic polarization, mediated through spin-orbit coupling of hole. We show that the tetrahedral symmetry around $rm{Mn^{2+}}
$ ion impurity is spontaneously broken even in the paramagnetic regime. Modest local lattice distortions around the impurity $rm{Mn^{2+}}$ ion, along with the growth strain, stabilize magnetization along $< 110 >$ directions, in the ferromagnetic regime. We explain the experimentally observed in-plane uniaxial magnetic anisotropy seen in this system using this symmetry-breaking mechanism.
We computationally study the frustrated magnetic configurations of a thin soft magnetic layer with the boundary condition fixed by underlying hard magnets. Driven by geometrical constraints and external magnetic field, transitions between frustrated
energy minima result in magnetic hysteretic behavior. The presence of soft-magnet introduces strong undulations in the energy landscape in a length scale set by the magnetic property of the soft magnet. We propose a possible use of the phenomena to locally control the movement of magnetic nanoparticles.
