Robust ferromagnetism in wafer-scale monolayer and multilayer Fe<sub>3</sub>GeTe<sub>2</sub>
ORAL
Abstract
Until now, the two-dimensional ferromagnets remain mostly limited to exfoliated micron-sized samples. Large-scale thin films are desirable for the fabrication of integrated devices for spintronic and memory storage applications. Among this group of materials, Fe3GeTe2 (FGT) can host ferromagnetic states at room temperature upon optimized gating. We achieve, by molecular beam epitaxy, the synthesis of high-quality monolayer and multilayer FGT films. Surface x-ray diffraction confirms its quintuple layer substructures with hexagonal symmetry. Thickness-dependent transport measurements are used to probe and characterize magnetic order. Ferromagnetic states exist in 1-10 layer thick Fe3GeTe2, with Curie temperatures ranging from ~75 K in one layer samples to above 175 K in ten layer samples. A ferromagnetic phase with significant magnetic anisotropy is revealed for all layer numbers.
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Presenters
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Ryan Roemer
University of British Columbia
Authors
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Ryan Roemer
University of British Columbia
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Chong Liu
Quantum Matter Institute, University of British Columbia, University of British Columbia
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Hyungki Shin
Quantum Matter Institute, University of British Columbia, University of British Columbia, Department of Physics and Astronomy, University of British Columbia
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Ke Zou
Quantum Matter Institute, University of British Columbia, University of British Columbia, Department of Physics and Astronomy, University of British Columbia