Magneto optic imaging of domain walls in a Bi doped YFe ferrite

H. FERRARI, V. BEKERIS AND T.H.JOHANSEN

PHYSICA B - CONDENSED MATTER

Elsevier

Lugar: Amsterdam; Año: 2007 vol. 398 p. 476 - 478

0921-4526

Magneto-optic (MO) imaging is based on Faraday rotation of a linearly polarized incident light beam illuminating a sensitive MO layer (MOL) placed in close contact to the sample. For in-plane magnetized layers of Lu3xBixFe5yGayO12 ferrimagnetic garnet films, zig-zag domain formation occurs whenever the sample stray parallel field component, HJ, changes sign. Considering the anisotropy, exchange and magnetostatic energies in the Ne´ el tails, and the contribution of an applied magnetic field, it is possible to describe the zigzag walls that separate domains with opposite in-plane magnetization. The size of the walls decreases with the spatial derivative of HJ. We studied the evolution of these domains as we steadily forced the change in sign of HJ to shorter length scales, from hundreds to a few microns. We describe the samples used to control the change in sign of HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.3xBixFe5yGayO12 ferrimagnetic garnet films, zig-zag domain formation occurs whenever the sample stray parallel field component, HJ, changes sign. Considering the anisotropy, exchange and magnetostatic energies in the Ne´ el tails, and the contribution of an applied magnetic field, it is possible to describe the zigzag walls that separate domains with opposite in-plane magnetization. The size of the walls decreases with the spatial derivative of HJ. We studied the evolution of these domains as we steadily forced the change in sign of HJ to shorter length scales, from hundreds to a few microns. We describe the samples used to control the change in sign of HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.HJ, changes sign. Considering the anisotropy, exchange and magnetostatic energies in the Ne´ el tails, and the contribution of an applied magnetic field, it is possible to describe the zigzag walls that separate domains with opposite in-plane magnetization. The size of the walls decreases with the spatial derivative of HJ. We studied the evolution of these domains as we steadily forced the change in sign of HJ to shorter length scales, from hundreds to a few microns. We describe the samples used to control the change in sign of HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.HJ. We studied the evolution of these domains as we steadily forced the change in sign of HJ to shorter length scales, from hundreds to a few microns. We describe the samples used to control the change in sign of HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.HJ to shorter length scales, from hundreds to a few microns. We describe the samples used to control the change in sign of HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.HJ at the MOL plane, and we analyze the images that evolve from zig-zag walls to much more complex closed domain structures.