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Van der Waals (vdW) magnetic materials such as Cr2Ge2Te6 (CGT) show promisefor novel memory and logic applications. This is due to their broadly tunablemagnetic properties and the presence of topological magnetic features such asskyrmionic bubbles. A systematic study of thickness and oxidation effects onmagnetic domain structures is important for designing devices and vdWheterostructures for practical applications. Here, we investigate thicknesseffects on magnetic properties, magnetic domains, and bubbles inoxidation-controlled CGT crystals. We find that CGT exposed to ambientconditions for 30 days forms an oxide layer approximately 5 nm thick. Thisoxidation leads to a significant increase in the oxidation state of the Crions, indicating a change in local magnetic properties. This is supported byreal space magnetic texture imaging through Lorenz transmission electronmicroscopy. By comparing the thickness dependent saturation field of oxidizedand pristine crystals, we find that oxidation leads to a non-magnetic surfacelayer with a thickness of about 10 nm, thicker than the oxide layer alone. Wealso find that the stripe domain width and skyrmionic bubble size are stronglyaffected by the crystal thickness in pristine crystals. These findingsunderscore the impact of thickness and surface oxidation on the properties ofCGT such as saturation field and domain/skyrmionic bubble size and suggest apathway for manipulating magnetic properties through a controlled oxidationprocess.

Magnetic Property Control of Cr2Ge2Te6 Through Oxidation and Thickness Effects