Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Skyrmions III
MA 37.7: Talk
Thursday, March 21, 2024, 11:00–11:15, EB 301
Skyrmion lattice and helical spin waves in the B20 chiral magnet Cr0.82Mn0.18Ge — •Victor Ukleev1, Priyaranjan Baral2, Jonathan White2, Chen Luo1, Florin Radu1, and Luana Caron1,3 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 2Paul Scherrer Institute, Villigen, Switzerland — 3Faculty of Physics, Bielefeld University, Bielefeld, Germany
In our comprehensive investigation, we delve into the intriguing magnetic properties of the solid solution Cr0.82Mn0.18Ge, which emerges from the chiral cubic B20-type compounds CrGe and MnGe. While CrGe remains a metallic paramagnet devoid of long-range magnetic order, MnGe is a helimagnet with a short spiral pitch of a few nm. Our study reveals a striking difference from the behaviors of the parent compounds and Cr0.82Mn0.18Ge. Bulk measurements, coupled with small-angle neutron scattering, unambiguously establish the helimagnetic ground state below the critical temperature (TC) of 13 K, wherein the spiral pitch undergoes a notable variation from 40 to 35 nm upon cooling to 2 K. We identify a low-field induced skyrmion state in the A-phase, extending over an unusually wide temperature range, 6 K below TC. Remarkably, these field-cooled skyrmions persist as a metastable state at the base temperature and zero field, demonstrating the unique and robust nature of this magnetic configuration. This study not only contributes to the understanding of the magnetic phase diagram of Cr0.82Mn0.18Ge but also highlights the emergence and stability of exotic magnetic states in this solid solution, paving the way for further exploration of its unique magnetic properties.
Keywords: skyrmions; helimagnetism; spin waves