SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism I

MA 18.5: Talk

Tuesday, March 28, 2023, 16:15–16:30, HSZ 02

Coexistence of antiferromagnetism and ferrimagnetism in adjacent honeycomb layers — •Lilian Prodan^1,2, Viorel Felea^1,2,3, Yurii Skourskii³, Sergei Zherlitsyn³, Joachim Wosnitza³, Alexander Tsirlin⁴, Vladimir Tsurkan^1,2, and Istvan Kezsmarki¹ — ¹Experimental Physics V, Institute of Physics, University of Augsburg, D-86159, Augsburg, Germany — ²Institute of Applied Physics, MD 2028, Chisinau, R. Moldova — ³Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, 01328 Dresden, Germany — ⁴Felix Bloch Institute for Solid-State Physics, Leipzig University, 04103 Leipzig, Germany

Recent theoretical and experimental studies of the honeycomb antiferromagnets A₂Mo₃O₈ (A = Mn, Fe, Co, Ni, Zn) revealed a plethora of fascinating effects, such as strong linear and non-linear magnetoelectric effects, giant magnetoelectricity, hidden ferromagnetism, and topological magnons, being of interest for both fundamental and applied research. Here, we report a sequence of metamagnetic transitions in the polar antiferromagnet Co₂Mo₃O₈ based on magnetization, torque and ultrasound measurements in static and pulsed magnetic fields up to 65 T. Our studies reveal a novel spin state that is composed of an alternating stacking of antiferromagnetic and ferrimagnetic honeycomb layers. The strong intra-layer and the weak inter-layer exchange couplings together with competing anisotropies at octahedral and tetrahedral Co sites are identified as the key ingredients to stabilize antiferromagnetic and ferrimagnetic layers in such a close proximity [1]. [1]. D. Szaller et al., arXiv:2202.04700 (2022).