Interior and edge magnetization in thin exfoliated CrGeTe3 films

Abstract

CrGeTe3 (CGT) is a semiconducting vdW ferromagnet shown to possess magnetism down to a two-layer thick sample. Although CGT is one of the leading candidates for spintronics devices, a comprehensive analysis of CGT thickness dependent magnetization is currently lacking. In this work, we employ scanning SQUID-on-tip (SOT) microscopy to resolve the magnetic properties of exfoliated CGT flakes at 4.2 K. Combining transport measurements of CGT/NbSe2 samples with SOT images, we present the magnetic texture and hysteretic magnetism of CGT, thereby matching the global behavior of CGT to the domain structure extracted from local SOT magnetic imaging. Using this method, we provide a thickness dependent magnetization state diagram of bare CGT films. No zero-field magnetic memory was found for films thicker than 10 nm and hard ferromagnetism was found below that critical thickness. Using scanning SOT microscopy, we identify a unique edge magnetism, contrasting the results attained in the CGT interior.

arXiv commentMain text: 15 pages, 5 figures. Supplementary information: 9 pages, 10 figures. Supplementary videos: 5

References in corpus (23)

• Boron nitride substrates for high-quality graphene electronics
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Ultrafast graphene photodetector
• Graphene Spintronics
• Two-Dimensional Itinerant Ising Ferromagnetism in Atomically thin Fe3GeTe2
• Van der Waals heterostructures for spintronics and opto-spintronics
• Tunable metal-insulator transition in double-layer graphene heterostructures
• Probing magnetism in 2D materials at the nanoscale with single spin microscopy
• Mapping the twist angle and unconventional Landau levels in magic angle graphene
• Scanning nano-SQUID with single electron spin sensitivity
• Hard magnetic properties in nanoflake van der Waals Fe3GeTe2
• Use of frit-disc crucibles for routine and exploratory solution growth of single crystalline samples
• Large magneto-optical effects and magnetic anisotropy energy in two-dimensional Cr${}_2$Ge${}_2$Te${}_6$
• New Materials Physics
• Large anomalous Hall effect in ferromagnetic insulator-topological insulator heterostructures
• Probing Magnetism in Insulating Cr2Ge2Te6 by Induced Anomalous Hall Effect in Pt
• Magnetic anisotropy of the single-crystalline ferromagnetic insulator Cr2Ge2Te6
• Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene
• Thickness-dependent magnetic order in CrI${}_3$ single crystals
• SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging
• Dynamics of Successive Minor Hysteresis Loops
• Long-range anisotropic Heisenberg ferromagnets and electrically tunable ordering

Cited by in corpus (10)

• A seamless graphene spin valve based on proximity to van der Waals magnet Cr${}_2$Ge${}_2$Te${}_6$
• Visualizing thickness-dependent magnetic textures in few-layer ${\text{Cr}}_2{\text{Ge}}_2{\text{Te}}_6$
• Nano-Patterned Magnetic Edges in CrGeTe3 for Quasi 1-D Spintronic Devices
• Sizable suppression of magnon Hall effect by magnon damping in Cr${}_2$Ge${}_2$Te${}_6$
• Scanning SQUID-on-tip microscope in a top-loading cryogen-free dilution refrigerator
• Flux-pinning mediated superconducting diode effect in the NbSe${}_2$/CrGeTe${}_3$ heterostructure
• Anomalous size dependence of the coercivity of nanopatterned CrGeTe3
• Field-induced antiferromagnetic correlations in a nanopatterned van der Waals ferromagnet: a potential artificial spin ice
• Gate-tunable anomalous Hall effect in stacked van der Waals ferromagnetic insulator - topological insulator heterostructures
• Microwave resonator for measuring time-reversal symmetry breaking at cryogenic temperatures