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arXiv · 2210.00897

Hybrid magnetization dynamics in $\text{Cu}_\text{2}\text{OSeO}_\text{3}$/$\mathrm{NiFe}$ heterostructures

Carolina Lüthi·Luis Flacke·Aisha Aqeel·Akashdeep Kamra·Rudolf Gross·Christian Back·Mathias Weiler
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Abstract

We investigate the coupled magnetization dynamics in heterostructures of a single crystal of the chiral magnet $\mathrm{Cu_2OSeO_3}$ (CSO) and a polycrystalline ferromagnet $\mathrm{NiFe}$ (Py) thin film using broadband ferromagnetic resonance (FMR) at cryogenic temperatures. We observe the excitation of a hybrid mode (HM) below the helimagnetic transition temperature of CSO. This HM is attributed to the spin dynamics at the CSO/Py interface. We study the HM by measuring its resonance frequencies for in plane rotations of the external magnetic field. We find that the HM exhibits dominantly four-fold anisotropy, in contrast to the FMR of CSO and Py.

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Carolina Lüthi, Luis Flacke, Aisha Aqeel, Akashdeep Kamra, Rudolf Gross, Christian Back, Mathias Weiler. 2022-09-30. Hybrid magnetization dynamics in $\text{Cu}_\text{2}\text{OSeO}_\text{3}$/$\mathrm{NiFe}$ heterostructures. https://doi.org/10.1063/5.0128733

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