Interior and Edge Magnetization in Thin Exfoliated CrGeTe3Films

Avia Noah, Hen Alpern, Sourabh Singh, Alon Gutfreund, Gilad Zisman, Tomer D. Feld, Atzmon Vakahi, Sergei Remennik, Yossi Paltiel, Martin Emile Huber, Victor Barrena, Hermann Suderow, Hadar Steinberg, Oded Millo, Yonathan Anahory*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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/NbSe2samples 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.

Original languageAmerican English
Pages (from-to)3165-3172
Number of pages8
JournalNano Letters
Volume22
Issue number7
DOIs
StatePublished - 13 Apr 2022

Bibliographical note

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© 2022 American Chemical Society. All rights reserved.

Keywords

  • 2D magnetism
  • CrGeTe
  • edge magnetism
  • scanning SQUID-on-Tip microscopy
  • superconducting/ferromagnetic interface

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