Micromagnetics of magnetization reversal in amorphous Tb-Fe films by Lorentz microscopy

Abstract

Lorentz electron microscopy has been used to investigate the micromagnetic mechanism of M-H hysteresis loop behavior of thin amorphous TbFe films with perpendicular easy-axis magnetic anisotropy. Detailed nucleation and growth behavior of reverse domains was observed while an applied field provided by the microscope objective lens along the film normal was slowly changed. Very different results between Tb19Fe81 and Tb32Fe68 films have been observed. The reverse domain grew more or less radially in the former case, while a dendritelike domain pattern was observed for the latter case.