Magnetic Quasidomain Structures In Ru-doped La_(0.6)sr_(0.4)mno_3 Thin Films

摘要

We investigated magnetic composite domain structures in Ru-doped La_(0.6)Sr_(0.4)MnO_3 thin films epitaxially grown on SrTiO_3 (001) substrates with use of a high-precision spin-imaging technique. Quasidomains composed of numerous fine domains were clearly discerned in high-resolution images, indicating magnetic anisotropy with multiple oblique easy axes with respect to the film plane. The impact of the Ru doping on the change in magnetic anisotropy was revealed by quantitative analysis of the composite domain structures.