Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Spin dynamics and transport
MA 26.12: Vortrag
Mittwoch, 3. April 2019, 12:30–12:45, H37
High field magnetoresistivity and spin fluctuation theory in thin film MnSi — •Nico Steinki1, David Schroeter1, Niels Wächter1, Dirk Menzel1, Hans Werner Schumacher2, Ilya Sheikin3, and Stefan Süllow1 — 1IPKM, TU Braunschweig, Germany — 2Physikalisch Technische Bundesanstalt, Braunschweig, Germany — 3Laboratoire National des Champs Magnétiques Intenses, CNRS, UGA, Grenoble, France
Spin fluctuations in the itinerant helical magnet MnSi have been discussed in terms of the self-consistent renormalization (SCR) theory [1]. Correspondingly, previous high field studies on bulk MnSi have been taken as proof of basic SCR predictions [2]. Here, we present a study of the magnetoresistivity of thin film MnSi in high magnetic fields. We establish that the magnetoresistivity of thin film MnSi can essentially be understood in terms of spin fluctuation theory, allowing us to compare our data to studies of bulk material. However, despite a close qualitative resemblance of bulk and thin film data, there are clear quantitative differences. We propose that these reflect modifications to the spin fluctuation spectra in thin film MnSi, as compared to bulk material.
[1] T. Moriya, Spin Fluctuations in Itinerant Electron Magnetism, (Solid-State Sciences) (Berlin: Springer) (1985).
[2] T. Sakakibara, H. Morimoto, and M. Date: J. Phys. Soc. Jpn. 51, 2439 (1982).