Regensburg 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 23: Focus Session: Magneto-Transport and Magneto-Optics of Higher Orders in Magnetization I

MA 23.3: Vortrag

Mittwoch, 19. März 2025, 10:30–10:45, H20

Unconventional Magneto-Optical Effects — •Rudolf Schäfer and Ivan Soldatov — Leibniz Institute for Solid State and Materials Research (IFW), Dresden, Germany

Numerous magneto-optical reflection effects will be discussed that have hardly been considered in the past and that lead to intensity-based domain contrast in the absence of analyser and compensator in a wide-field magneto-optical microscope: (i) The transverse Kerr effect can be applied for in-plane magnetized material. (ii) In- and out-of-plane magnetized material can be imaged by circularly polarized light, leading to domain contrasts with different symmetry as the conventional Kerr contrast. (iii) Plane-polarized light at a specific angle can be employed for both in-plane and perpendicular media (Oppeneer effect). (iv) Perpendicular light incidence leads to a contrast on in-plane materials that is quadratic in the magnetization and to a domain boundary contrast. In case (iii), the contrast is generated by magnetic circular dichroism, while magnetic linear dichroism is responsible for the contrast in case (iv). The latter, being due to the diagonal elements in the quadratic dielectric magneto-optical tensor has a different symmetry as the conventional linear birefringence (Voigt) effect which is due to the off-diagonal elements. The domain*boundary contrast is caused by the magneto-optical gradient effect, which also exists as birefringence and dichroic effect. Reference: R. Schäfer, et al., Appl. Phys. Rev. 8, 031402 (2021)

Keywords: Magneto-optical effects; Magnetic domains; Magnetic domain imaging; Magneto-optische Effekte