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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.