Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Spintronics

MA 18.3: Talk

Tuesday, September 6, 2022, 15:30–15:45, H47

Studying Spin Dynamics of Thin Cr₂Ge₂Te₆, using Superconducting Resonators — •Christoph W. Zollitsch¹, Safe Khan¹, Nam Vu Thanh Trung², Dimitrios Sagkovits¹, Ivan Verzhbitskiy², Goki Eda², and Hidekazu Kurebayashi¹ — ¹London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom — ²Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551

Two-dimensional van der Waals material systems gained an increased interest in the field of spintronics, as they can maintain ferromagnetic order even down to the few monolayer regime. These materials naturally permit device miniaturization. An ideal test bed for new spintronics applications in the 2D limit is the ferromagnetic semiconductor Cr₂Ge₂Te₆, where intrinsic ferromagnetism has been discovered for atomic bilayers [1].

We investigate the spin dynamics of thin exfoliated flakes (11 - 150 nm) of Cr₂Ge₂Te₆, using superconducting lumped element resonators made of NbN. The flakes are transferred directly on top of several superconducting resonator structures, featuring resonance frequencies from 12 GHz to 18 GHz. We perform ferromagnetic resonance (FMR) at a temperature of 1.8 K and can easily resolve the response from the flakes, even down to a thickness of 11 nm. With our multi-resonator approach, can confirm a Kittel FMR behaviour for the full thickness range. The FMR data can very well be described with bulk values of the magnetic parameters.
[1] Cheng Gong et al., Nature 546, 265-269 (2017)