Journal
NATURE MATERIALS
Volume 16, Issue 12, Pages 1187-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat4990
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Funding
- JSPS KAKENHI [5H05702, 26870300, 26870304, 26103002, 25220604, 2604316]
- Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University
- RAMP
- D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS)
- National Research Foundation of Korea (NRF) grant - Korea Government (MSIP) [2017R1C1B2009686, NRF-2016R1A5A1008184]
- DGIST RAMP
- D Program of the Ministry of Science, ICT and Future Planning [17-BT-02]
- Army Research Office [W911NF-14-1-0016]
- Overseas Researcher under Postdoctoral Fellowship of JSPS [P16314]
- National Research Foundation of Korea [NRF-2015M3D1A1070465, NRF-2017R1A2B2006119]
- JSPS KAKENHI [5H05702, 26870300, 26870304, 26103002, 25220604, 2604316]
- Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University
- RAMP
- D project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS)
- National Research Foundation of Korea (NRF) grant - Korea Government (MSIP) [2017R1C1B2009686, NRF-2016R1A5A1008184]
- DGIST RAMP
- D Program of the Ministry of Science, ICT and Future Planning [17-BT-02]
- Army Research Office [W911NF-14-1-0016]
- Overseas Researcher under Postdoctoral Fellowship of JSPS [P16314]
- National Research Foundation of Korea [NRF-2015M3D1A1070465, NRF-2017R1A2B2006119]
- Grants-in-Aid for Scientific Research [16F16314, 26103002, 26103004, 17H05181] Funding Source: KAKEN
- Ministry of Science & ICT (MSIT), Republic of Korea [N11170149, 17-BT-02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017R1C1B2009686, 2015M3D1A1070465, 2016R1A5A1008184, 2017R1A2B2006119] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Antiferromagnetic spintronics is an emerging research field which aims to utilize antiferromagnets as core elements in spintronic devices(1,2). A central motivation towards this direction is that antiferromagnetic spin dynamics is expected to be much faster than its ferromagnetic counterpart(3). Recent theories indeed predicted faster dynamics of antiferromagnetic domain walls (DWs) than ferromagnetic DWs(4-6). However, experimental investigations of antiferromagnetic spin dynamics have remained unexplored, mainly because of the magnetic field immunity of antiferromagnets(7). Here we show that fast field-driven antiferromagnetic spin dynamics is realized in ferrimagnets at the angular momentum compensation point TA. Using rare earth-3d-transition metal ferrimagnetic compounds where net magnetic moment is nonzero at TA, the field-driven DW mobility is remarkably enhanced up to 20 km s(-1) T-1. The collective coordinate approach generalized for ferrimagnets(8) and atomistic spin model simulations(6,9) show that this remarkable enhancement is a consequence of antiferromagnetic spin dynamics at TA. Our finding allows us to investigate the physics of antiferromagnetic spin dynamics and highlights the importance of tuning of the angular momentum compensation point of ferrimagnets, which could be a key towards ferrimagnetic spintronics.
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