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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 Prodan^2,3, Korbinian Geirhos², Viorel Felea^2,3,4, Yurii Skourski⁴, Denis Gorbunov⁴, Tobias Förster⁴, Toni Helm⁴, Toshihiro Nomura^4,5, Atsuhiko Miyata⁴, Sergei Zherlitsyn⁴, Jochen Wosnitza^4,6, Alexander A. Tsirlin², Vladimir Tsurkan^2,3, 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.