Magnetic imaging of thin film α-Fe<sub>2</sub>O<sub>3</sub> using a single-spin magnetometer

ORAL

Abstract

Antiferromagnetic (AF) materials have great potential in spintronic applications thanks to their sub-picosecond timescale dynamics, thermally stable spin order, and insensitivity to external magnetic fields. α-Fe2O3 is an AF insulator with canted spins that display weak ferromagnetism at room temperature. It has recently been used to demonstrate spin orbit torque manipulation of Néel order using spin Hall magnetoresistance as the readout mechanism [1,2]. To better understand the magnetism of α-Fe2O3 and how it is manipulated, here we report magnetic imaging of α-Fe2O3 thin films with a nitrogen-vacancy center based scanning magnetometer. Our results show sub-micron scale magnetic features detected 50 nm above the sample. We will discuss our progress in directly observing current switching of the Néel order in an insulating AF thin film.
[1] Cheng Y et al. PRL, (2020), 124(2)
[2] Zhang P et al. PRL, (2019), 123(24)

*We acknowledge support from the Cornell Center for Materials Research with funding from the NSF MRSEC program (DMR-1719875), the NSF (DMR-2004466), and the Kavli Institute at Cornell for Nanoscale Science.

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Presenters

  • Qiaochu Guo

    • AEP, Cornell University

Authors

  • Qiaochu Guo

    • AEP, Cornell University

  • Yang Cheng

    • Ohio State Univ - Columbus
    • Deparment of Physics, The Ohio State University
    • Physics, The Ohio State University
    • Department of Physics, Ohio State University

  • Pengxiang Zhang

    • EECS, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Isaiah Gray

    • Cornell University
    • Princeton University

  • Fengyuan Yang

    • Ohio State Univ - Columbus
    • Deparment of Physics, The Ohio State University
    • Department of Physics, The Ohio State University
    • Physics, The Ohio State University
    • Department of Physics, Ohio State University
    • The Ohio State University
    • Physics, Ohio State University
    • Physics Department, The Ohio State University, Columbus, Ohio 43210

  • Luqiao Liu

    • Massachusetts Institute of Technology MIT
    • EECS, Massachusetts Institute of Technology

  • Katja Nowack

    • Physics, Cornell University
    • Cornell University

  • Gregory Fuchs

    • Cornell University
    • AEP, Cornell University
    • School of Applied and Engineering Physics, Cornell University