Magneto-optic (MO) imaging is based on Faraday rotation of a linearly polarized incident light beam illuminating a sensitive MO layer placed in close contact to the sample. For in-plane magnetized layers of Lu 3-x Bi x Fe 5-y Ga y O 12 ferrimagnetic garnet films, zig-zag domain formation occurs whenever the sample stray parallel field component changes sign. In this work we study the behavior of zig-zag domain walls that appear when the garnet is placed over samples with in-plane magnetization like audio tapes recorded with different signals. We describe the zig-zag walls considering the anisotropy, exchange and magnetostatic energies in the Neel tails and the contribution of an applied magnetic field. Using different recorded signals we have been able to control the gradient of stray parallel field component on the garnet, changing the distance between domains and the size of zig-zag walls. We could even avoid the appearance of these zig-zag domain walls and obtain closed domains structures. We also study the behavior of the domain walls when an external magnetic field is applied parallel to the sample. © 2012 Elsevier B.V.
Documento: | Artículo |
Título: | Magneto-optic study of the behavior of magnetic domains walls in ferrimagnetic garnet films placed over samples with in-plane magnetization |
Autor: | Moreno, A.J.; Ferrari, H. |
Filiación: | Laboratorio de Bajas Temperaturas, Departamento de Física, Universidad de Buenos Aires, Argentina |
Palabras clave: | Magneto optic; Neels and Bloch walls; Zig-zag domain walls; Applied magnetic fields; Bloch wall; Domain formation; External magnetic field; Ferrimagnetic garnet film; Field components; In-plane magnetization; Incident light beams; Linearly polarized; Magnetostatic energy; Recorded signals; Zig-zag; Ferrimagnetism; Garnets; Magnetic fields; Magnetization; Magnetooptical effects; Magnetic domains |
Año: | 2012 |
Volumen: | 407 |
Número: | 16 |
Página de inicio: | 3117 |
Página de fin: | 3120 |
DOI: | http://dx.doi.org/10.1016/j.physb.2011.12.040 |
Título revista: | Physica B: Condensed Matter |
Título revista abreviado: | Phys B Condens Matter |
ISSN: | 09214526 |
CODEN: | PHYBE |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3117_Moreno |