Fukami-Kanai Laboratory
Research Institute of Electrical Communication, Tohoku University

It is our pleasure to announce the 1st Online RIEC International Workshop on Spintronics. The workshop consists of a live session to be held on November 18 and twelve on-demand invited talks. Once you register from the website of the workshop, you will receive a confirmation e-mail, which contains the information to access the on-demand contents and live session. 

The panelists of the live session include the following researchers.

　　　Pietro Gambardella (ETH Zürich)
　　　Tomáš Jungwirth (Czech Academy of Sciences)
　　　Mathias Kläui (Johannes Gutenberg-Universität Mainz)
　　　Kyung-Jin Lee (KAIST)
　　　Chi-Feng Pai (National Taiwan University)
　　　Shunsuke Fukami (Tohoku University)

We hope for your active participation.

Our paper “Sigmoidal curves of stochastic magnetic tunnel junctions with perpendicular easy axis,” by K. Kobayashi, W. A. Borders, S. Kanai, K. Hayakawa, H. Ohno, and S. Fukami, was published in Applied Physics Letters.

Prof. Fukami’s talk entitled “Electrical Manipulation of Non-Collinear Antiferromagnet” given at the On-line SPICE-SPIN+X Seminar held on July 21  was posted on YouTube.

Our paper “Unconventional Hall effect and its variation with Co-doping in van der Waals Fe₃GeTe₂” by R. Roy Chowdhury, S. DuttaGupta, C. Patra, O. A. Tretiakov, S. Sharma, S. Fukami, H. Ohno & R. P. Singh was published in Scientific Reports.

Our paper “Spin-transport Mediated Single-shot All-optical Magnetization Switching of Metallic Films” by S. Iihama, Q. Remy, J. Igarashi, G. Malinowski, M. Hehn, and S. Mangin was published in Journal of the Physical Society of Japan.

Our paper “Influence of domain wall anisotropy on the current-induced hysteresis loop shift for quantification of the Dzyaloshinskii-Moriya interaction” by T. Dohi, S. Fukami, and H. Ohno was published in Physical Review B.

Our paper “Correlation of anomalous Hall effect with structural parameters and magnetic ordering in Mn_3+xSn_1−x thin films” by J.-Y. Yoon, Y. Takeuchi, S. DuttaGupta, Y. Yamane, S. Kanai, J. Ieda, H. Ohno, and S. Fukami was published in AIP Advances.

Our paper “Electrically connected spin-torque oscillators array for 2.4 GHz WiFi band transmission and energy harvesting” by R. Sharma, R. Mishra, T. Ngo, Y.-X. Guo, S. Fukami, H. Sato, H. Ohno and H. Yang was published in Nature Communications.

Press release: “Wireless and Battery-free Spintronic Energy Harvester“

Our paper “Chiral-spin rotation of non-collinear antiferromagnet by spin–orbit torque” by Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Itoh, B. Jinnai, S. Kanai, J. Ieda, S. Fukami and H. Ohno  was published in Nature Materials.

Press release: “A New Spintronic Phenomenon: Chiral-spin Rotation Found in Non-collinear Antiferromagnet“

A roadmap article “Roadmap of spin-orbit torques” by Q. Shao, P. Li, L. Liu, H. Yang, S. Fukami et al. was published in the Early Access area of the IEEE Transactions on Magnetics.

2021/06/25 Formal version of this paper was published. Link to the paper.

Our paper “Double-Free-Layer Magnetic Tunnel Junctions for Probabilistic Bits” by K. Y. Camsari, M. M. Torunbalci, W. A. Borders, H. Ohno, and S. Fukami was published in Physical Review Applied. This paper is selected to Editor’s Suggestion.

In addition, a synopsis “Maximizing Volatility in Magnetic Tunnel Junctions” is published in Physics Magazine of the American Physical Society.

Mr. Igarashi (Doctor), Mr, Borders (Doctor), Mr. Okuda (Master), Mr. Takamatsu (Master), Mr. Zoysa (Master), Mr, Kishi (Bachelor), and Mr. Kobayashi (Bachelor) received their degree. Congratulations!

Our papers “Nanosecond Random Telegraph Noise in In-Plane Magnetic Tunnel Junctions” by K. Hayakawa, S. Kanai, T. Funatsu, J. Igarashi, B. Jinnai, W. A. Borders, H. Ohno, and S. Fukami and “Theory of relaxation time of stochastic nanomagnets” by S. Kanai, K. Hayakawa, H. Ohno, and S. Fukami are jointly published in Physical Review Letters and Physical Review B, respectively.
These papers are selected to Editor’s Suggestion.

Press release: “Demonstrating the World’s Fastest Spintronics p-bit“

Our paper “Magnetization processes and magnetic domain structures in Ta/CoFeB/MgO stacks” by A. K. Dhiman, T. Dohi, W. Dobrogowski, Z. Kurant, I. Sveklo, S. Fukami, H. Ohno, A. Maziewski was published in Journal of Magnetism and Magnetic Materials.

Our paper “Intrinsic and extrinsic tunability of Rashba spin-orbit coupled emergent inductors” by J. Ieda and Y. Yamane was published in Physical Review B as a Letter.
This paper is selected to Editor’s Suggestion. 

Our paper “Field-free and sub-ns magnetization switching of magnetic tunnel junctions by combining spin-transfer torque and spin–orbit torque” by C. Zhang, Y. Takeuchi, S. Fukami, and H. Ohno was published in Applied Physics Letters.

This paper is selected to Editor’s Pick. 

Our paper “Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions” by B. Jinnai, J. Igarashi, K. Watanabe, E. C. I. Enobio, S. Fukami, and H. Ohno was published in Applied Physics Letters.
This paper is selected to Editor’s Pick. 

(2021/3/30; Erratum on this paper was published. In the original article, “sin” and “cos” were mistakenly swapped. The analysis was made by the correct form and the conclusions of the paper are not affected by this erratum.)

Our paper “Temperature dependence of the energy barrier in X/1X nm shape-anisotropy magnetic tunnel junctions” by J. Igarashi, B. Jinnai, V. Desbuis, S. Mangin, S. Fukami, and H. Ohno was published in Applied Physics Letters.

Our paper “Dual-Port SOT-MRAM Achieving 90-MHz Read and 60-MHz Write Operations Under Field-Assistance-Free Condition” by M. Natsui, A. Tamakoshi, H. Honjo, T. Watanabe, T. Nasuno, C. Zhang, T. Tanigawa, H. Inoue, M. Niwa, T. Yoshiduka, Y. Noguchi, M. Yasuhira, Y. Ma, H. Shen, S. Fukami, H. Sato, S. Ikeda, H. Ohno, T. Endoh, and T. Hanyu was published in an Early Access area of IEEE Journal of Solid-State Circuits.

We will present “High-Performance Shape-Anisotropy Magnetic Tunnel Junctions down to 2.3 nm” (by B. Jinnai, J. Igarashi, K. Watanabe, T. Funatsu, H. Sato, S. Fukami, and H. Ohno) in the IEEE International Electron Devices Meeting (IEDM2020) on December 12-18.

Press release: “The World’s Smallest High-performance Magnetic Tunnel Junction” 

Our paper “Engineering Single-Shot All-Optical Switching of Ferromagnetic Materials” by J. Igarashi, Q. Remy, S. Iihama, G. Malinowski, M. Hehn, J. Gorchon, J. Hohlfeld, S. Fukami, H. Ohno, and S. Mangin was published in Nano Letters.

Our paper “Probing edge condition of nanoscale CoFeB/MgO magnetic tunnel junctions by spin-wave resonance” by M. Shinozaki, T. Dohi, J. Igarashi, J. Llandro, S. Fukami, and H. Ohno was published in Applied Physics Letters.

J. Igarashi (D3) was awarded the Young Scientist Presentation Award in the JSAP Autumn Meeting. The title of the presentation was “Energy barrier of X/1X-nm shape-anisotropy magnetic tunnel junctions at high temperature”. Congratulations!

Our paper “Spin-orbit torque switching of an antiferromagnetic metallic heterostructure” by Samik DuttaGupta, A. Kurenkov, Oleg A. Tretiakov, G. Krishnaswamy, G. Sala, V. Krizakova, F. Maccherozzi, S. S. Dhesi, P. Gambardella, S. Fukami & H. Ohno  was published in Nature Communications.

Press release: “Antiferromagnetic Material’s Giant Stride Towards Application“. 

J. Igarashi (D3) was awarded the Best English Presentation Award in the JSAP Autumn Meeting. The title of the presentation was “Energy barrier of X/1X-nm shape-anisotropy magnetic tunnel junctions at high temperature”. Congratulations!

Our paper “Multidomain Memristive Switching of Pt₃₈Mn₆₂/[Co/Ni]_n Multilayers” by G. K. Krishnaswamy, A. Kurenkov, G. Sala, M. Baumgartner, V. Krizakova, C. Nistor, F. Maccherozzi, S. S. Dhesi, S. Fukami, H. Ohno, and P. Gambardella was published in Physical Review Applied.

Our paper “Energy Efficient Control of Ultrafast Spin Current to Induce Single Femtosecond Pulse Switching of a Ferromagnet” by Q. Remy, J. Igarashi, S. Iihama, G. Malinowski, M. Hehn, J. Gorchon, J. Hohlfeld, S. Fukami, H. Ohno, and S. Mangin was published in Advanced Science.

Press release is here.

Prof. Ohno (Advisor) gave an online seminar entitled “Spintronics Nanodevice – How small can we make it and what else can we use it for -” at the On-line SPICE-SPIN+X Seminars. The video is available on YouTube.

Our paper “All-optical probe of magnetization precession modulated by spin–orbit torque” by K. Ishibashi, S. Iihama, Y. Takeuchi, K. Furuya, S. Kanai, S. Fukami, and S. Mizukami was published in Applied Physics Letters. This paper is selected to a Featured Article.

Our paper “Antiferromagnetic spintronics” by S. Fukami, V. O. Lorenz, and O. Gomonay was published in Journal of Applied Physics.
This paper is a Guest Editorial for the Special Topic “Antiferromagnetic Spintronics” in the Journal of Applied Physics, to which Prof. Fukami had served as a Guest Editor. 

Our paper “Giant voltage-controlled modulation of spin Hall nano-oscillator damping” by H. Fulara, M. Zahedinejad, R. Khymyn, M. Dvornik, S. Fukami, S. Kanai, H. Ohno and J. Åkerman was published in Nature Communications.

Press release is here.

Our paper “Composition dependence of spin−orbit torque in Pt_1−xMn_x/CoFeB heterostructures” by K. V. De Zoysa, S. DuttaGupta, R. Itoh, Y. Takeuchi, H. Ohno, and S. Fukami was published in Applied Physics Letters. This paper is selected to Editor’s Pick.

Our invited paper “Neuromorphic computing with antiferromagnetic spintronics” by A. Kurenkov, S. Fukami, H. Ohno. was published in Journal of Applied Physics.

Our paper “Current distribution in metallic multilayers from resistance measurements” by O. Stejskal, A. Thiaville, J. Hamrle, S. Fukami, and H. Ohno was published in Physical Review B.

Our review paper “Scaling magnetic tunnel junction down to single-digit nanometers — Challenges and prospects” by B. Jinnai, K. Watanabe, S. Fukami, H. Ohno was published in Applied Physics Letters. This paper is selected to a Featured Article.

Our paper “Visualizing Magnetic Structure in 3D Nanoscale Ni–Fe Gyroid Networks” by J. Llandro, S. Fukami, H. Ohno et al. was published in Nano Letters.

Press release is here.

Mr. Yuichiro Abe (M1) has joined us! 

Welcome to our laboratory!

Mr. T. Dohi (D3) has received the Graduate School of Engineering Award. Congratulations!

A review paper “Neuromorphic spintronics” by J. Grollier, D. Querlioz, K. Y. Camsari, K. Everschor-Sitte, S. Fukami & M. D. Stiles was published in Nature Electronics.

Prof. Yuta Yamane, an Assistant Professor of the Frontier Research Institute for Interdisciplinary Sciences, joined us.

Dr. Aleksandr Kurenkov was awarded the Grand Prize of 2018-19 Photo Contest of Tohoku University. Congratulations!
Link to University website

Our paper “Stack structure and temperature dependence of spin-orbit torques in heterostructures with antiferromagnetic PtMn” by R. Itoh, Y. Takeuchi, S. DuttaGupta, S. Fukami, and H. Ohno was published in Applied Physics Letters.

We will report a result of SOT-MRAM at IEDM2019 held in San Francisco, USA. This research has been conducted under a collaboration with the Center for Innovative Integrated Electronic Systems, Tohoku University.
Press release is here.