Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Takaya Okuno; Duck Ho Kim; Se Hyeok Oh; Se Kwon Kim; Yuushou Hirata; Tomoe Nishimura; Woo Seung Ham; Yasuhiro Futakawa; Hiroki Yoshikawa; Arata Tsukamoto; Yaroslav Tserkovnyak; Yoichi Shiota; Takahiro Moriyama; Kab Jin Kim; Kyung Jin Lee; Teruo Ono

doi:10.1038/s41928-019-0303-5

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Takaya Okuno, Duck Ho Kim, Se Hyeok Oh, Se Kwon Kim, Yuushou Hirata, Tomoe Nishimura, Woo Seung Ham, Yasuhiro Futakawa, Hiroki Yoshikawa, Arata Tsukamoto, Yaroslav Tserkovnyak, Yoichi Shiota, Takahiro Moriyama, Kab Jin Kim, Kyung Jin Lee, Teruo Ono

Department of Materials Science and Engineering

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

45 Citations (Scopus)

Abstract

Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spin-transfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium–iron–cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.

Original language	English
Pages (from-to)	389-393
Number of pages	5
Journal	Nature Electronics
Volume	2
Issue number	9
DOIs	https://doi.org/10.1038/s41928-019-0303-5
Publication status	Published - 2019 Sept 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Electrical and Electronic Engineering

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10.1038/s41928-019-0303-5

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Okuno, T., Kim, D. H., Oh, S. H., Kim, S. K., Hirata, Y., Nishimura, T., Ham, W. S., Futakawa, Y., Yoshikawa, H., Tsukamoto, A., Tserkovnyak, Y., Shiota, Y., Moriyama, T., Kim, K. J., Lee, K. J., & Ono, T. (2019). Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets. Nature Electronics, 2(9), 389-393. https://doi.org/10.1038/s41928-019-0303-5

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title = "Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets",

abstract = "Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spin-transfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium–iron–cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.",

author = "Takaya Okuno and Kim, {Duck Ho} and Oh, {Se Hyeok} and Kim, {Se Kwon} and Yuushou Hirata and Tomoe Nishimura and Ham, {Woo Seung} and Yasuhiro Futakawa and Hiroki Yoshikawa and Arata Tsukamoto and Yaroslav Tserkovnyak and Yoichi Shiota and Takahiro Moriyama and Kim, {Kab Jin} and Lee, {Kyung Jin} and Teruo Ono",

note = "Funding Information: This work was supported by the JSPS KAKENHI (grants 15H05702, 26870300, 26870304, 26103002, 26103004, 25220604 and 2604316), the Collaborative Research Program of the Institute for Chemical Research, Kyoto University and the R&D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS). This work was partly supported by the Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University. D.-H.K. was supported as an Overseas Researcher under the Postdoctoral Fellowship of JSPS (grant P16314). S.K.K. and Y.T. acknowledge support from the Army Research Office under contract no. W911NF-14-1-0016. K.-J.K. was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2017R1C1B2009686 and NRF-2016R1A5A1008184). K.-J.L. acknowledges support from the Samsung Research Funding Center of Samsung Electronics under project no. SRFCMA1702-02. Publisher Copyright: {\textcopyright} 2019, The Author(s), under exclusive licence to Springer Nature Limited.",

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doi = "10.1038/s41928-019-0303-5",

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T1 - Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

AU - Okuno, Takaya

AU - Kim, Duck Ho

AU - Oh, Se Hyeok

AU - Kim, Se Kwon

AU - Hirata, Yuushou

AU - Nishimura, Tomoe

AU - Ham, Woo Seung

AU - Futakawa, Yasuhiro

AU - Yoshikawa, Hiroki

AU - Tsukamoto, Arata

AU - Tserkovnyak, Yaroslav

AU - Shiota, Yoichi

AU - Moriyama, Takahiro

AU - Kim, Kab Jin

AU - Lee, Kyung Jin

AU - Ono, Teruo

N1 - Funding Information: This work was supported by the JSPS KAKENHI (grants 15H05702, 26870300, 26870304, 26103002, 26103004, 25220604 and 2604316), the Collaborative Research Program of the Institute for Chemical Research, Kyoto University and the R&D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS). This work was partly supported by the Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University. D.-H.K. was supported as an Overseas Researcher under the Postdoctoral Fellowship of JSPS (grant P16314). S.K.K. and Y.T. acknowledge support from the Army Research Office under contract no. W911NF-14-1-0016. K.-J.K. was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2017R1C1B2009686 and NRF-2016R1A5A1008184). K.-J.L. acknowledges support from the Samsung Research Funding Center of Samsung Electronics under project no. SRFCMA1702-02. Publisher Copyright: © 2019, The Author(s), under exclusive licence to Springer Nature Limited.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spin-transfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium–iron–cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.

AB - Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spin-transfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium–iron–cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.

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DO - 10.1038/s41928-019-0303-5

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VL - 2

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EP - 393

JO - Nature Electronics

JF - Nature Electronics

IS - 9

ER -

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

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