Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Magnetic Textures: Statics and Imaging I
MA 7.5: Vortrag
Montag, 1. April 2019, 16:15–16:30, H37
Metamagnetic texture in a polar antiferromagnet — •Dmitry A. Sokolov1, Ulrich Rößler2, Naoki Kikugawa3, Robert Cubitt4, Andrew P. Mackenzie1, Toni Helm1, and Kurt Kummer5 — 1MPI CPfS, Dresden, Germany — 2IFW, Dresden, Germany — 3National Institute for Materials Science, Tsukuba, Japan — 4Institut Laue-Langevin, Grenoble, France — 5ESRF, Grenoble, France
We report a new type of mixed state between antiferromagnetism and ferromagnetism, which can be created in certain acentric materials. In the Small-Angle Neutron Scattering (SANS) experiments we observe a field-driven spin-state in the layered antiferromagnet Ca3Ru2O7, which is modulated on a scale between 8 and 20 nm and has both antiferromagnetic and ferromagnetic parts [1]. We call this state a metamagnetic texture and explain its appearance by the chiral twisting effects of the asymmetric Dzyaloshinskii-Moriya (DM) exchange. The observation can be understood as an extraordinary coexistence, in one thermodynamic state, of spin-orders belonging to different symmetries.
[1] Metamagnetic texture in a polar antiferromagnet, D. A. Sokolov et al., arXiv:1810.06247.