Spin current related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect

Ye Du; Saburo Takahashi; Junsaku Nitta

doi:10.1103/PhysRevB.103.094419

Spin current related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect

Ye Du, Saburo Takahashi, Junsaku Nitta

ENG - Materials Science

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

Abstract

We analyze the experimentally obtained spin current related magnetoresistance (MR) in epitaxial Pt/Co bilayers by using a drift-diffusion model that incorporates both bulk spin Hall effect and interfacial Rashba-Edelstein effect (REE). The MR analysis yields, for the Pt/Co interface, a temperature-independent Rashba parameter in the order of 10-11eVm that agrees with theoretical calculations, along with an effective interfacial REE thickness of several angstroms, which is in overall consistency with our previous spin-orbit torque analysis. Our results suggest that both bulk and interface charge-spin current interconversions need to be taken into account for the spin current related MR analysis in highly conductive magnetic heterostructures such as the epitaxial Pt/Co bilayers.

Original language	English
Article number	094419
Journal	Physical Review B
Volume	103
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.103.094419
Publication status	Published - 2021 Mar 12

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Spin current related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect",

abstract = "We analyze the experimentally obtained spin current related magnetoresistance (MR) in epitaxial Pt/Co bilayers by using a drift-diffusion model that incorporates both bulk spin Hall effect and interfacial Rashba-Edelstein effect (REE). The MR analysis yields, for the Pt/Co interface, a temperature-independent Rashba parameter in the order of 10-11eVm that agrees with theoretical calculations, along with an effective interfacial REE thickness of several angstroms, which is in overall consistency with our previous spin-orbit torque analysis. Our results suggest that both bulk and interface charge-spin current interconversions need to be taken into account for the spin current related MR analysis in highly conductive magnetic heterostructures such as the epitaxial Pt/Co bilayers.",

author = "Ye Du and Saburo Takahashi and Junsaku Nitta",

note = "Funding Information: We would like to thank Prof. Makoto Kohda, Shutaro Karube, Jeongchun Ryu, Hiromu Gamou, and Ryan Thompson for fruitful discussions. This work was partially supported by the Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) in Grant-in-Aid for Scientific Research (Grant No. 15H05699) and the Japan Society for the Promotion of Science Core-to-Core program (Grant No. JPJSCCA20160005). Y.D. acknowledges the Center for Science and Innovation in Spintronics (CSIS), Tohoku University for financial support. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = mar,

day = "12",

doi = "10.1103/PhysRevB.103.094419",

language = "English",

volume = "103",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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TY - JOUR

T1 - Spin current related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect

AU - Du, Ye

AU - Takahashi, Saburo

AU - Nitta, Junsaku

N1 - Funding Information: We would like to thank Prof. Makoto Kohda, Shutaro Karube, Jeongchun Ryu, Hiromu Gamou, and Ryan Thompson for fruitful discussions. This work was partially supported by the Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) in Grant-in-Aid for Scientific Research (Grant No. 15H05699) and the Japan Society for the Promotion of Science Core-to-Core program (Grant No. JPJSCCA20160005). Y.D. acknowledges the Center for Science and Innovation in Spintronics (CSIS), Tohoku University for financial support. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/3/12

Y1 - 2021/3/12

N2 - We analyze the experimentally obtained spin current related magnetoresistance (MR) in epitaxial Pt/Co bilayers by using a drift-diffusion model that incorporates both bulk spin Hall effect and interfacial Rashba-Edelstein effect (REE). The MR analysis yields, for the Pt/Co interface, a temperature-independent Rashba parameter in the order of 10-11eVm that agrees with theoretical calculations, along with an effective interfacial REE thickness of several angstroms, which is in overall consistency with our previous spin-orbit torque analysis. Our results suggest that both bulk and interface charge-spin current interconversions need to be taken into account for the spin current related MR analysis in highly conductive magnetic heterostructures such as the epitaxial Pt/Co bilayers.

AB - We analyze the experimentally obtained spin current related magnetoresistance (MR) in epitaxial Pt/Co bilayers by using a drift-diffusion model that incorporates both bulk spin Hall effect and interfacial Rashba-Edelstein effect (REE). The MR analysis yields, for the Pt/Co interface, a temperature-independent Rashba parameter in the order of 10-11eVm that agrees with theoretical calculations, along with an effective interfacial REE thickness of several angstroms, which is in overall consistency with our previous spin-orbit torque analysis. Our results suggest that both bulk and interface charge-spin current interconversions need to be taken into account for the spin current related MR analysis in highly conductive magnetic heterostructures such as the epitaxial Pt/Co bilayers.

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Spin current related magnetoresistance in epitaxial Pt/Co bilayers in the presence of spin Hall effect and Rashba-Edelstein effect

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