SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Frustrated Magnets II
MA 44.2: Vortrag
Donnerstag, 30. März 2023, 15:15–15:30, HSZ 403
Coexistence of antiferromagnetism and ferrimagnetism in adjacent honeycomb layers — •Dávid Szaller1, Lilian Prodan2,3, Korbinian Geirhos2, Viorel Felea2,3,4, Yurii Skourski4, Denis Gorbunov4, Tobias Förster4, Toni Helm4, Toshihiro Nomura4,5, Atsuhiko Miyata4, Sergei Zherlitsyn4, Jochen Wosnitza4,6, Alexander A. Tsirlin2, Vladimir Tsurkan2,3, and Istvan Kezsmarki2 — 1Tu Wien — 2University of Augsburg — 3Institute of Applied Physics, R. Moldova — 4Hochfeld-Magnetlabor Dresden — 5University of Tokyo, Kashiwa — 6TU Dresden
Ferro/ferri- and antiferromagnetic orders are typically exclusive in nature, thus, their co-existence in atomic-scale proximity is expected only in heterostructures. Breaking this paradigm we report the observation of a new, atomic-scale hybrid spin state. This ordering is stabilized in three-dimensional crystals of the polar antiferromagnet Co2Mo3O8 by magnetic fields applied perpendicular to the Co honeycomb layers and possesses a spontaneous in-plane ferromagnetic moment. Our microscopic spin model, capturing the observed field dependence of the longitudinal and transverse magnetization as well as the magnetoelectric/elastic properties, reveals that this novel spin state is composed of an alternating stacking of antiferromagnetic and ferrimagnetic honeycomb layers. We show that the proper balance of magnetic interactions can extend the stability range of this hybrid phase down to zero magnetic field. The layer-by-layer stacking of distinct spin orders via suitable combinations of microscopic interactions opens a new dimension toward the nanoscale engineering of magnetic states.