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MA: Fachverband Magnetismus

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

MA 23.1: Invited Talk

Wednesday, March 19, 2025, 09:30–10:00, H20

Magneto-transport effects in crystalline magnetic films — •Sebastian T. B. Goennenwein — Fachbereich Physik, Universität Konstanz, Konstanz, Germany

The magneto-transport response of magnetically ordered materials – such as the anisotropic magneto-resistance (AMR), or the anomalous Hall effect (AHE) – has been extensively studied in the last decades. While the magneto-transport response of amorphous or polycrystalline samples can often be described by comparatively simple expressions, the implications of crystal symmetry lead to a much richer and more complex response in single-crystalline specimens [1]. In particular, higher-order terms with a seemingly ’unconventional’ dependence on the magnetization can be allowed by symmetry, and indeed also be detected in experiment [2].

In the presentation, I will first review the implications imposed onto the magneto-transport response by crystal symmetry, and then discuss typical experimental results, focusing on crystalline (Ga,Mn)As films as a prototypical and well-studied example [3,4]. If time permits, I will furthermore touch upon the impact of crystalline symmetry onto the magneto-thermopower response.

[1] R. R. Birss, Symmetry and Magnetism (North-Holland, Amsterdam, 1966)

[2] P. K. Muduli et al., Phys. Rev. B 72, 104430 (2005)

[3] W. Limmer et al., Phys. Rev. B 74, 205202 (2006)

[4] W. Limmer et al., Phys. Rev. B 77, 205210 (2008)

Keywords: magneto-transport; anomalous Hall effect; crystal symmetry; anisotropic magnetoresistance