Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 29: Skyrmions II
MA 29.4: Talk
Wednesday, March 19, 2025, 15:45–16:00, H20
Magnetometry on the low-temperature skyrmion state in Cu2OSeO3 — Christian Oberleitner1, •Lukas Heindl1, Johannes Friedrich1, Andreas Bauer1,2, Denis Mettus1,3, Helmut Berger4, and Christian Pfleiderer1,2,3 — 1Physik-Dep., TU Munich, D-85748 Garching — 2ZQE, TU Munich, D-85748 Garching — 3MLZ, TU Munich, D-85747 Garching — 4Inst. de Phys., EPFL, CH-1015 Lausanne
In cubic chiral magnets, skyrmion lattice states emerge near the magnetic ordering temperature, stabilized by thermal fluctuations [1]. Recently, a distinct low-temperature skyrmion state (LTS) was observed in Cu2OSeO3 for magnetic fields along the ⟨100⟩ axes, emphasizing the role of cubic anisotropies [2, 3]. Nucleation of this state at low temperatures requires an intermediate phase, the tilted conical phase, and has been studied mainly along major crystallographic axes [4].
Here, we examine the nucleation dynamics of the LTS under field rotation away from high-symmetry directions. Magnetization and ac susceptibility measurements on spherical and cuboid samples reveal key geometry effects. Spherical samples, with uniform internal field distributions, show significant spontaneous LTS nucleation. In contrast, cuboid samples, with inhomogeneous internal fields, need external field pumping to achieve substantial LTS populations[5].
[1]: S. Mühlbauer et al., Science, 323 (2009) 915-919 [2]: S. Seki et al., Phys. Rev. B, 85 (2012) 220406(R) [3]: A. Chacon et al., Nat. Phys., 14 (2018) 936-941 [4]: M. Halder et al., Phys Rev., B 98 (2018) 144429 [5]: A. Aqeel et al., Phys. Rev. Lett., 126 (2021) 017202
Keywords: skyrmion; tilted conical; kinetic limitation; Cu2OSeO3