Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films

Andrew Ross; Romain Lebrun; Camilo Ulloa; Daniel A. Grave; Asaf Kay; Lorenzo Baldrati; Florian Kronast; Sergio Valencia; Avner Rothschild; Mathias Klaüi

doi:10.1103/PhysRevB.102.094415

Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films

Andrew Ross, Romain Lebrun, Camilo Ulloa, Daniel A. Grave, Asaf Kay, Lorenzo Baldrati, Florian Kronast, Sergio Valencia, Avner Rothschild, Mathias Klaüi

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Reading the magnetic state of antiferromagnetic (AFM) thin films is key for AFM spintronic devices. We investigate the underlying physics behind the spin Hall magnetoresistance (SMR) of bilayers of platinum and insulating AFM hematite (α-Fe2O3) and find an SMR efficiency of up to 0.1%, comparable to ferromagnetic-based structures. To understand the observed complex SMR field dependence, we analyze the effect of misalignments of the magnetic axis that arise during growth of thin films, by electrical measurements and direct magnetic imaging, and find that a small deviation can result in significant signatures in the SMR response. This highlights the care that must be taken when interpreting SMR measurements on AFM spin textures.

Original language	English
Article number	094415
Journal	Physical Review B
Volume	102
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.102.094415
State	Published - 1 Sep 2020
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.102.094415

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title = "Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films",

abstract = "Reading the magnetic state of antiferromagnetic (AFM) thin films is key for AFM spintronic devices. We investigate the underlying physics behind the spin Hall magnetoresistance (SMR) of bilayers of platinum and insulating AFM hematite (α-Fe2O3) and find an SMR efficiency of up to 0.1%, comparable to ferromagnetic-based structures. To understand the observed complex SMR field dependence, we analyze the effect of misalignments of the magnetic axis that arise during growth of thin films, by electrical measurements and direct magnetic imaging, and find that a small deviation can result in significant signatures in the SMR response. This highlights the care that must be taken when interpreting SMR measurements on AFM spin textures.",

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AU - Ross, Andrew

AU - Lebrun, Romain

AU - Ulloa, Camilo

AU - Grave, Daniel A.

AU - Kay, Asaf

AU - Baldrati, Lorenzo

AU - Kronast, Florian

AU - Valencia, Sergio

AU - Rothschild, Avner

AU - Klaüi, Mathias

PY - 2020/9/1

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N2 - Reading the magnetic state of antiferromagnetic (AFM) thin films is key for AFM spintronic devices. We investigate the underlying physics behind the spin Hall magnetoresistance (SMR) of bilayers of platinum and insulating AFM hematite (α-Fe2O3) and find an SMR efficiency of up to 0.1%, comparable to ferromagnetic-based structures. To understand the observed complex SMR field dependence, we analyze the effect of misalignments of the magnetic axis that arise during growth of thin films, by electrical measurements and direct magnetic imaging, and find that a small deviation can result in significant signatures in the SMR response. This highlights the care that must be taken when interpreting SMR measurements on AFM spin textures.

AB - Reading the magnetic state of antiferromagnetic (AFM) thin films is key for AFM spintronic devices. We investigate the underlying physics behind the spin Hall magnetoresistance (SMR) of bilayers of platinum and insulating AFM hematite (α-Fe2O3) and find an SMR efficiency of up to 0.1%, comparable to ferromagnetic-based structures. To understand the observed complex SMR field dependence, we analyze the effect of misalignments of the magnetic axis that arise during growth of thin films, by electrical measurements and direct magnetic imaging, and find that a small deviation can result in significant signatures in the SMR response. This highlights the care that must be taken when interpreting SMR measurements on AFM spin textures.

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Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films

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