Evidence for spin swapping in an antiferromagnet

Lin, Weiwei; He, Jiaming; Ma, Bowen; Matzelle, Matthew; Xu, Jinsong; Freeland, John; Choi, Yongseong; Haskel, Daniel; Barbiellini, Bernardo; Bansil, Arun; Fiete, Gregory A.; Zhou, Jianshi; Chien, C. L.

doi:10.1038/s41567-022-01608-w

Evidence for spin swapping in an antiferromagnet

Journal Article · Mon May 16 00:00:00 EDT 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-022-01608-w· OSTI ID:1962076

^[1]; ^[2]; Ma, Bowen ^[2]; Matzelle, Matthew ^[3]; Xu, Jinsong ^[1]; Freeland, John ^[4]; ^[4]; Haskel, Daniel ^[4]; Barbiellini, Bernardo ^[5]; ^[3]; ^[6]; Zhou, Jianshi ^[2]; Chien, C. L. ^[1]

Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of Texas, Austin, TX (United States)
Northeastern Univ., Boston, MA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Lappeenranta University of Technology (Finland); Northeastern Univ., Boston, MA (United States)
Northeastern Univ., Boston, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Antiferromagnetic insulators offer strategic advantages in spintronic applications because of their negligible stray fields and ultrafast magnetic dynamics. Control of their magnetization and readout of their magnetic state are essential for these applications but remain challenging. In this work, we report the electrical detection of room-temperature magnetization switching in the canted antiferromagnetic insulator LaFeO₃, capped with a Pt or W overlayer. The observation of a large magneto-thermovoltage with an in-plane temperature gradient suggests that the mechanism is the swapping of spin currents in the antiferromagnet. This effect provides a sensitive electrical probe of the tiny net magnetization in the insulator, which can be manipulated by a magnetic field on the order of 10 mT. Our results highlight a new material class of insulating canted antiferromagnets for spintronics and spin caloritronics and suggests a method for the electrical readout of magnetic signals in an antiferromagnetic insulator. Electrical readout of the state of an antiferromagnet is an important goal for spintronic applications. Now, detection of the electrical voltage created by a thermal gradient in a canted antiferromagnet suggests a route for achieving this goal.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; SC0019275

OSTI ID:: 1962076

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 7 Vol. 18; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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