Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.78: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Magneto-optical effects in L₁₀−Mn_xGa films with giant perpendicular anisotropy — •Liane Brandt¹, Lijun Zhu¹, Jianhua Zhao², and Georg Woltersdorf¹ — ¹Institute of Physics, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 3, 06120 Halle, Germany — ²State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083, China

We report very large polar magneto-optical effects in metallic L₁₀−Mn_xGa (0.76 ≤ x ≤ 1.5) epitaxial films with giant perpendicular magnetic anisotropy (K_u ∼ 1 MJ/m³). Both the Kerr rotation and ellipticity show a strong dependence on the sample composition most likely caused by a variation of spin-orbit coupling strength and strain. A Kerr rotation of up to 0.1 degrees is observed for a 40 nm thick film for a wavelength of 650 nm at room temperature. The large polar Kerr effect, the high reflectivity, and the giant magnetic anisotropy make L₁₀−Mn_xGa a promising material for high frequency spintronic and magneto-optic applications.