Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.63: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Influence of granularity on the magnetotransport-properties of manganese-monosilicide — •Sebastian Kölsch and Michael Huth — Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany

Silicon-based alloys with 3d magnetic metals offer the potential for applications in spintronics and magnetic storage devices. Recently the manganese-monosilicide (MnSi) of B20-type attracted high interest due to a topological non-trivial magnetic phase in bulk MnSi at low temperatures (<30K), which could be identified as magnetic whirls known as skyrmions [1].

Considering potential applications, a reduction of dimensionality in terms of thin magnetic/semiconducting films is mandatory. In this case change of the magnetic phase diagram due to surface anisotropy and strain effects have to be taken into account. So far research has focused on optimizing the thin film growth conditions to obtain ideally monocrystalline epitaxial thin films. However, polycrystalline thin films grown by pulsed laser deposition (PLD) with increased degree of disorder, e.g. caused by non stoichiometric proportions of Mn and Si show a high-temperature (>300K) ferromagnetic phase near an insulator-metal-transition [2].

Here we present recent results on the successful growth of epitaxial but nano-granular MnSi thin films showing an unexpectedly high magnetoresistance effect.

[1] Mühlbauer, S. et al. Science 323, 915-919 (2009)

[2] Nikolaev, S. N. et al. AIP Advances 6, 015020 (2016)