Anisotropy Dispersion of Amorphous Co-Ti Thin Films

Abstract

Amorphous Co-Ti films have been prepared by sputtering technique. Anisotropy dispersion and domain structures have been investigated. Co-Ti films are annealed in a static (DFA) or a rotating (RFA) field. By DFA, it is possible to induce the anisotropy. In Co₈₃Ti₁₇ DFA films of 1 μm thickness, the anisotropy is induced to 8 Oe. Half width of magnitude dispersion of the distributed curve is ±0.6 Oe while the angular dispersion is several degrees. By RFA, the anisotropy can be reduced, and its easy axis is widely distributed to cover almost 360°. Considering dispersion, the difference between the initial permeability calculated by the anisotropy measured macroscopically and the measured one seems difficult to explain.