AVS 65th International Symposium & Exhibition
    2D Materials Focus Topic Tuesday Sessions
       Session 2D+EM+MI+NS-TuM

Invited Paper 2D+EM+MI+NS-TuM5
Discovering and Visualizing Ferromagnetism in Intrinsic Two Dimensional Materials

Tuesday, October 23, 2018, 9:20 am, Room 201B

Session: Properties of 2D Materials including Electronic, Magnetic, Mechanical, Optical, and Thermal Properties
Presenter: Jing Xia, University of California Irvine
Correspondent: Click to Email
In this talk, I will discuss our recent results on discovering and visualizing in 2D magnetism using a unique scanning Sagnac MOKE microscope, which is based on a Sagnac interferometer technique and has achieved unprecedented nano-radian level Kerr and Faraday sensitivity even at DC. In exfoliated Cr2Ge2Te6 (CGT) atomic layers, we report the discovery of intrinsic ferromagnetism in 2D van der Walls crystals, defying the well-known Mermin-Wagner theorem. Unlike 3D magnetism, the ferromagnetic order in this 2D system is stabilized by magnetic anisotropy from the CGT structure, which is not present in graphene. As a result, changing the magnetic anisotropy with a small external magnetic field was found to strongly enhance the Curie temperature, which is a feature unique to 2D magnetism.