Magnetic dichroism in the soft x-ray regime for magnetic domain imaging by total yield microscopy (abstract)
- Institut fuer Angewandte Physik der Heinrich-Heine-Universitaet Duesseldorf (Germany)
Among the techniques for studying magnetic materials, methods utilizing magnetic dichroism in the soft x-ray region are receiving particular attention because of the unique feature of chemical specificity introduced by probing core levels. In soft x-ray absorption of linearly polarized light, the dichroism is proportional to the square of the magnetization {ital M}. The transverse magneto-optic Kerr effect is characterized by a change of the specular reflectivity when {ital M} is reversed, thus it is linear in {ital M}. Due to the relationship between reflected and transmitted radiation, a dichroism may also be expected in the absorption. We confirmed this by quasi-simultaneous measurement of the reflectivity and total yield around the Fe and Co 3{ital p} thresholds, using {ital p}-polarized light at oblique incidence: Switching the magnetization between the two directions normal on the plane of incidence indeed shows a magnetic dichroism. The relationship between the dichroisms in total yield and specular reflectivity was investigated as function of incidence angle. In addition to this new form of magnetic dichroism, other forms have been explored for imaging near-surface magnetic domains of elemental and compound materials in a total yield microscope. By using different light polarizations different components of the magnetization are detected. {ital p}- and circular polarization yield magnetization components parallel to the surface, normal to and in the plane of light incidence, respectively. With linearly {ital s}-polarized light, images similar to those with circularly polarized light were obtained. This is evidence for a sizeable Faraday rotation, leading to a significant degree of circular polarization before the optical transition takes place. The helicity of the Faraday-induced ellipitical polarization depends on the local sample magnetization, thereby generating the magnetic contrast. (Abstract Truncated)
- OSTI ID:
- 282051
- Report Number(s):
- CONF-951101-; ISSN 0021-8979; TRN: 96:023733
- Journal Information:
- Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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