Probing Spin Dynamics of van der Waals Magnetic Heterostructures using Cryo-Sagnac magneto-optical Kerr Interferometry and qSPLEEM

ORAL

Abstract



Van der Waals (vdW) magnetic heterostructures are fundamental platforms to study novel spin dynamics and magnetic phenomena on an atomically thin scale and these devices have applications in fields such as low power electronics and magnetic random-access memory. In our group, we investigate spin-orbit torque driven spin dynamics in vdW magnetic and topological [1] devices in a steady and current driven quasi-dynamic state. We utilize advanced optical and electron microscope techniques such as cryogenic Sagnac magneto-optical Kerr rotation interferometry[2] to sensitively readout the out of plane magnetic moments and spin-polarized low energy electron microscopy (SPLEEM) at the Molecular Foundry at the Lawrence Berkeley National Laboratory (LBNL) [3] to image surface state electron spin textures. I will discuss our recent progress using these two probes to study novel 2D spin textures at micron-scale and nanometer-scale spatial spin resolutions.

*We acknowledge funding from U.S. DOE (DE-SC0025422), University of Southern California and the USC Dana and David Dornsife College of Letters, Arts and Sciences Graduate School Fellowship

–

Publication: Ivan Pelayo, Derek Bergner, Archibald J. Williams, Jiayuwen Qi, Penghao Zhu, Mahfuzun Nabi, Warren L. B. Huey, Luca Moreschini, Ziling Deng, Jonathan Denlinger, Alessandra Lanzara, Yuan-Ming Lu, Wolfgang Windl, Joshua Goldberger, & Claudia Ojeda-Aristizabal. (2024). New three-dimensional dispersion in the type-II Dirac semimetals PtTe$_2$ and PdTe$_2$ revealed through Angle Resolved Photoemission Spectroscopy.
Saba Karimeddiny et al., (2023). Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque. Science Advances, 9(36), eadi9039.
Rossi, A., er al. , (2023). Direct Visualization of the Charge Transfer in a Graphene/α-RuCl3 Heterostructure via Angle-Resolved Photoemission Spectroscopy. Nano Letters, 23(17), 8000-8005.

Presenters

  • Derek C Bergner

    • University of Southern California
    • Department of Physics and Astronomy, California State University, Long Beach

Authors

  • Derek C Bergner

    • University of Southern California
    • Department of Physics and Astronomy, California State University, Long Beach

  • Thow Min Jerald Cham

    • Caltech, Cornell University

  • Xiaokun Yu

    • University of Southern California

  • Eric Huang

    • University of Southern California

  • Orion Smedley

    • Cornell University

  • Nicholas G Dale

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory

  • Archibald J Williams

    • Department of Chemistry and Biochemistry, The Ohio State University
    • The Ohio State University

  • Daniel G Chica

    • Columbia University
    • Northwestern University
    • Columbia

  • Alexander Stibor

    • Lawrence Berkeley National Laboratory

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan
    • National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Joshua E Goldberger

    • Ohio State University

  • Joshua E Goldberger

    • Ohio State University

  • Andrew F May

    • Oak Ridge National Laboratory

  • Xavier Roy

    • Columbia University

  • Yunqiu (Kelly) Luo

    • University of Southern California