Direct Observation of Magnetic Bubble Lattices and Magnetoelastic Effects in van der Waals Cr2Ge2Te6

Author:

McCray Arthur R. C.12ORCID,Li Yue1,Qian Eric3,Li Yi1,Wang Wei4,Huang Zhengjie4,Ma Xuedan4,Liu Yuzi4,Chung Duck Young1,Kanatzidis Mercouri G.13,Petford‐Long Amanda K.15,Phatak Charudatta15ORCID

Affiliation:

1. Materials Science Division Argonne National Laboratory Lemont IL 60439 USA

2. Applied Physics Program Northwestern University Evanston IL 60208 USA

3. Department of Chemistry Northwestern University Evanston IL 60208 USA

4. Center for Nanoscale Materials Argonne National Laboratory Lemont IL 60439 USA

5. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA

Abstract

AbstractFerromagnetic van der Waals (vdW) materials are of large current interest for the fundamental study of low‐dimensional magnetism and for potential applications in multilayer heterostructures. Cr2Ge2Te6 (CGT) is particularly exciting because it is a ferromagnetic semiconductor with tunable electronic and magnetic properties. Controlling the magnetic domain structure of CGT is a requirement for understanding its novel interface physics and for tuning behavior for potential devices. Herein, cryo‐Lorentz transmission electron microscopy is performed in the temperature range of 12–50K to directly image the magnetic domain structures in CGT. A rich phase diagram of domain structures including stripe domains, magnetic bubble lattices of mixed‐chirality, and topologically‐protected lattices of homochiral magnetic bubbles is observed. The types and chiralities of the bubbles can be controlled by topographical changes in the CGT flakes. Additionally, it is observed that in‐plane strain and magnetoelastic coupling can align and organize both bubble lattices and stripe domains. This study provides insights into creating and controlling complex magnetic domain structures for integration into multilayer heterostructures and for future studies of 2D magnetism.

Funder

Basic Energy Sciences

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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