Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)

Ryan Thompson; Jeongchun Ryu; Ye Du; Shutaro Karube; Makoto Kohda; Junsaku Nitta

doi:10.1103/PhysRevB.101.214415

Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)

Ryan Thompson, Jeongchun Ryu, Ye Du, Shutaro Karube, Makoto Kohda, Junsaku Nitta

ENG - Materials Science

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

12 Citations (Scopus)

Abstract

We demonstrate that the spin Hall magnetoresistance (SMR) of epitaxial Pt/Co bilayers on MgO(110) single crystal substrates is strongly anisotropic and depends on the applied current direction with respect to the two primary in-plane crystal directions [001] and [110], in the Pt layer. SMR results at different temperatures qualitatively suggest the D'yakonov-Perel spin relaxation mechanism through the invariance of the spin diffusion length λsf for a given current direction, while also suggesting an anisotropic Rashba-Edelstein effect from the ratio of λsf[001] to λsf[110]. Finally, deviation from the standard SMR model spurs the need for new theory that properly characterizes and quantifies the anisotropies in such epitaxial systems.

Original language	English
Journal	Physical Review B
Volume	101
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.101.214415
Publication status	Published - 2020 Jun 1

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title = "Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)",

abstract = "We demonstrate that the spin Hall magnetoresistance (SMR) of epitaxial Pt/Co bilayers on MgO(110) single crystal substrates is strongly anisotropic and depends on the applied current direction with respect to the two primary in-plane crystal directions [001] and [110], in the Pt layer. SMR results at different temperatures qualitatively suggest the D'yakonov-Perel spin relaxation mechanism through the invariance of the spin diffusion length λsf for a given current direction, while also suggesting an anisotropic Rashba-Edelstein effect from the ratio of λsf[001] to λsf[110]. Finally, deviation from the standard SMR model spurs the need for new theory that properly characterizes and quantifies the anisotropies in such epitaxial systems.",

author = "Ryan Thompson and Jeongchun Ryu and Ye Du and Shutaro Karube and Makoto Kohda and Junsaku Nitta",

note = "Funding Information: This work was supported by the Graduate Program in Spintronics at Tohoku University. The authors also acknowledge financial support from the Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) in Grant-in-Aid for Scientific Research (Grant No. 15H05699) and the JSPS Core-to-Core program. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = jun,

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doi = "10.1103/PhysRevB.101.214415",

language = "English",

volume = "101",

journal = "Physical Review B",

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T1 - Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)

AU - Thompson, Ryan

AU - Ryu, Jeongchun

AU - Du, Ye

AU - Karube, Shutaro

AU - Kohda, Makoto

AU - Nitta, Junsaku

N1 - Funding Information: This work was supported by the Graduate Program in Spintronics at Tohoku University. The authors also acknowledge financial support from the Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) in Grant-in-Aid for Scientific Research (Grant No. 15H05699) and the JSPS Core-to-Core program. Publisher Copyright: © 2020 American Physical Society.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - We demonstrate that the spin Hall magnetoresistance (SMR) of epitaxial Pt/Co bilayers on MgO(110) single crystal substrates is strongly anisotropic and depends on the applied current direction with respect to the two primary in-plane crystal directions [001] and [110], in the Pt layer. SMR results at different temperatures qualitatively suggest the D'yakonov-Perel spin relaxation mechanism through the invariance of the spin diffusion length λsf for a given current direction, while also suggesting an anisotropic Rashba-Edelstein effect from the ratio of λsf[001] to λsf[110]. Finally, deviation from the standard SMR model spurs the need for new theory that properly characterizes and quantifies the anisotropies in such epitaxial systems.

AB - We demonstrate that the spin Hall magnetoresistance (SMR) of epitaxial Pt/Co bilayers on MgO(110) single crystal substrates is strongly anisotropic and depends on the applied current direction with respect to the two primary in-plane crystal directions [001] and [110], in the Pt layer. SMR results at different temperatures qualitatively suggest the D'yakonov-Perel spin relaxation mechanism through the invariance of the spin diffusion length λsf for a given current direction, while also suggesting an anisotropic Rashba-Edelstein effect from the ratio of λsf[001] to λsf[110]. Finally, deviation from the standard SMR model spurs the need for new theory that properly characterizes and quantifies the anisotropies in such epitaxial systems.

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DO - 10.1103/PhysRevB.101.214415

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VL - 101

JO - Physical Review B

JF - Physical Review B

IS - 21

ER -

Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)

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