池幼

signature=98e236da47b13dae563a199703a66b6a,Bulk Dzyaloshinskii–Moriya interaction in amorphous ferri...

Abstract

Symmetry breaking is a fundamental concept that prevails in many branches of physics

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Fig. 1: Schematic illustration of amorphous ferrimagnets and the experimental set-up for DMI measurements.

Fig. 2: Thickness dependence of DMI in SiN/GdFeCo/SiN samples.

Fig. 3: Characteristics of GdFeCo films through STEM and EELS.

Fig. 4: Tight-binding model calculation of the DMI energy for TM/RE bilayers with a composition gradient.

Fig. 5: Thickness dependence of DMI in SiN/GdFeCo/SiN, SiN/GdFeCo/Pt and SiN/GdFeCo/Cu samples.

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This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (grant nos 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 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 a Postdoctoral Fellowship of JSPS (grant no. P16314). K.-J.L. was supported by the National Research Foundation of Korea (NRF-2017R1A2B2006119), the Samsung Research Funding Center of Samsung Electronics under project no. SRFCMA1702-02 and the Korea Institute of Science and Technology (KIST) Institutional Program (project no. 2V05750). D.-Y.K. and S.-B.C. were supported by the Samsung Science & Technology Foundation (SSTF-BA1802-07) and the National Research Foundations of Korea (NRF) funded by the Ministry of Science and ICT (MSIT) (2015M3D1A1070465). D.-Y.K. was supported by the KIST institutional program (grant no. 2E29410) and the National Research Council of Science & Technology (grant no. CAP-16-01-KIST) funded by the Korea government (MSIT). S.K. was supported by the Creative Materials Discovery Program (2018M3D1A1089406) and the Basic Research Laboratory Program (NRF-2018R1A4A1020696) through the NRF.Author information

AffiliationsInstitute for Chemical Research, Kyoto University, Kyoto, Japan

Duck-Ho Kim, Mitsutaka Haruta, Tomoe Nishimura, Takaya Okuno, Yuushou Hirata, Wooseung Ham, Sanghoon Kim, Hiroki Kurata, Yoichi Shiota, Takahiro Moriyama & Teruo Ono

KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea

Hye-Won Ko, Hyeon-Jong Park & Kyung-Jin Lee

Department of Materials Science & Engineering, Korea University, Seoul, Republic of Korea

Gyungchoon Go & Kyung-Jin Lee

Department of Physics and Institute of Applied Physics, Seoul National University, Seoul, Republic of Korea

Dae-Yun Kim & Sug-Bong Choe

Center for Spintronics, Korea Institute of Science and Technology, Seoul, Republic of Korea

Dae-Yun Kim

College of Science and Technology, Nihon University, Funabashi, Chiba, Japan

Yasuhiro Futakawa, Hiroki Yoshikawa & Arata Tsukamoto

Department of Physics, University of Ulsan, Ulsan, Republic of Korea

Sanghoon Kim

Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Osaka, Japan

Teruo Ono

AuthorsDuck-Ho Kim

Mitsutaka Haruta

Hye-Won Ko

Gyungchoon Go

Hyeon-Jong Park

Tomoe Nishimura

Dae-Yun Kim

Takaya Okuno

Yuushou Hirata

Yasuhiro Futakawa

Hiroki Yoshikawa

Wooseung Ham

Sanghoon Kim

Hiroki Kurata

Arata Tsukamoto

Yoichi Shiota

Takahiro Moriyama

Sug-Bong Choe

Kyung-Jin Lee

Teruo Ono

Contributions

D.-H.K. conceptualized the work. D.-H.K. and T. Ono supervised the study. Y.F., H.Y. and A.T. prepared the films and T.N., T. Okuno, Y.H. and W.H. fabricated the devices. D.-H.K. and T.N. conducted the experiments for the DMI measurement. D.-Y.K. and S.-B.C. helped with the experiment for the asymmetric domain expansion. M.H. and H.K. performed the microscopy experiments. H.-W.K., G.G., H.-J.P. and K.-J.L. performed the numerical calculation based on the tight-binding model. D.-H.K. performed the analysis. D.-H.K., K.-J.L. and T.-Ono wrote the manuscript. All the authors discussed the results and commented on the manuscript.

Corresponding authors

Correspondence to

Duck-Ho Kim or Teruo Ono.Ethics declarations

Competing interests

The authors declare no competing interests.Additional information

Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Supplementary Information

Supplementary Notes 1–7, Supplementary Figs. 1–9, Supplementary Tables 1 and 2, and Supplementary References 1–13.About this article

Cite this article

Kim, DH., Haruta, M., Ko, HW. et al. Bulk Dzyaloshinskii–Moriya interaction in amorphous ferrimagnetic alloys.

Nat. Mater. 18,685–690 (2019). https://doi.org/10.1038/s41563-019-0380-xReceived:14 January 2018

Accepted:16 April 2019

Published:27 May 2019

Issue Date:July 2019

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