Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Weiwei Lin; Kai Chen; Shufeng Zhang; C. L. Chien

doi:10.1103/PhysRevLett.116.186601

Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Weiwei Lin, Kai Chen, Shufeng Zhang, C. L. Chien

Physics

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

177 Scopus citations

Abstract

We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.

Original language	English (US)
Article number	186601
Journal	Physical review letters
Volume	116
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.116.186601
State	Published - May 5 2016

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.116.186601

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title = "Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator",

abstract = "We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the N{\'e}el temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.",

author = "Weiwei Lin and Kai Chen and Shufeng Zhang and Chien, {C. L.}",

note = "Funding Information: This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Science, under Award Grant No.{\^A} DE-SC0009390. W. L. was supported in part by C-SPIN, one of six centers of STARnet, a SRC program sponsored by MARCO and DARPA. K. C. and S. Z. were supported by National Science Foundation under Grant No.{\^A} ECCS-1404542. W. L. thanks Ssu-Yen Huang from National Taiwan University for fruitful discussions. Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = may,

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doi = "10.1103/PhysRevLett.116.186601",

language = "English (US)",

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AU - Lin, Weiwei

AU - Chen, Kai

AU - Zhang, Shufeng

AU - Chien, C. L.

N1 - Funding Information: This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Science, under Award Grant No.Â DE-SC0009390. W. L. was supported in part by C-SPIN, one of six centers of STARnet, a SRC program sponsored by MARCO and DARPA. K. C. and S. Z. were supported by National Science Foundation under Grant No.Â ECCS-1404542. W. L. thanks Ssu-Yen Huang from National Taiwan University for fruitful discussions. Publisher Copyright: © 2016 American Physical Society.

PY - 2016/5/5

Y1 - 2016/5/5

N2 - We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.

AB - We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.

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Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

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