The interplay between spin-orbit interaction and magnetic order is one of the most active research fields in condensed matter physics and drives the search for materials with novel, and tunable, magnetic and spin properties. Here we report on a variety of unique and unexpected observations in thin multiferroic Ge1-xMnxTe films. The ferrimagnetic order parameter in this ferroelectric semiconductor is found to switch direction under magnetostochastic resonance with current pulses many orders of magnitude lower as for typical spin-orbit torque systems. Upon a switching event, the magnetic order spreads coherently and collectively over macroscopic distances through a correlated spin-glass state. Utilizing these observations, we apply a novel methodology to controllably harness this stochastic magnetization dynamics.

Dept of Condensed Matter Physics Charles University Ke Karlovu 5 121 16 Praha 2 Czech Republic

Dept of Condensed Matter Physics Masaryk University Kotlářská 267 2 61137 Brno Czech Republic

Institut de Physique École Polytechnique Fédérale de Lausanne CH 1015 Lausanne Switzerland

Institut für Halbleiter und Festkörperphysik Johannes Kepler Universität A 4040 Linz Austria

Institute of Experimental Physics Slovak Academy of Sciences Watsonova 47 040 01 Košice Slovakia

Institute of Physics ASCR v v i Cukrovarnická 10 162 53 Praha 6 Czech Republic

Institute of Physics P J Šafárik University in Košice Park Angelinum 9 040 01 Košice Slovakia

Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH 5232 Villigen PSI Switzerland

LPMS CY Cergy Paris Université 95031 Cergy Pontoise France

Max Planck Institut für Mikrostrukturphysik Weinberg 2 06120 Halle Germany

New Technologies Research Center University of West Bohemia Plzeň Czech Republic

Photon Science Division Paul Scherrer Institut CH 5232 Villigen Switzerland

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