Hayashi Group

News

2024

Isamu Yasuda won the 20th Spintonics research division Best English presentation award!!

Place: The 84th Japan Applied Physics Society (JSAP) autumn meeting.
Title: Evaluation of magnetoelastic coupling by acoustic spin Hall effect in heavy-metal/ferromagnet/rare-earth tri-layer
Congratulations!

2023

Publication: Optical detection of spin and orbital magnetic moments

Spin and orbital Hall currents detected via current-induced magneto-optical Kerr effect in V and Pt
Y. Marui, M. Kawaguchi, S. Sumi, H. Awano, K. Nakamura, M. Hayashi
Phys. Rev. B 108, 144436 (2023).

Publication: Real time observation of current induced domain walls in ferrimagnets

Ultrafast stroboscopic time-resolved magneto-optical imaging of domain wall motion in Pt/GdFeCo wires induced by a current pulse
K. Ogawa, N. Yoshikawa, M. Ishibashi, K. Yakushiji, A. Tsukamoto, M. Hayashi, R. Shimano
Phys. Rev. Research 5, 033151 (2023).

Publication: Determination of the magnetoelestic coupling constants

On-chip all-electrical determination of the magnetoelastic coupling constant of magnetic heterostructures
T Kawada, I Yasuda, M Kawaguchi, M Hayashi
Appl. Phys. Lett. 123, 092403 (2023).

Publication: Magnon-phonon coupling in synthetic antiferromagnets

Cavity magnomechanical coupling with coupled magnon modes in a synthetic antiferromagnet
M. Asano, H. Matsumoto, M. Hayashi, D. Hatanaka
Phys. Rev. B 108, 064415 (2023).

Publication: Spin Hall effect in ferromagnetic Dirac semimetals

Anisotropy of the spin Hall effect in a Dirac ferromagnet
G. Qu, M. Hayashi, M. Ogata, J. Fujimoto
Phys. Rev. B 108, 064404 (2023).

Publication: Helicity dependent Raman scattering in PtSe2

Helicity-resolved Raman spectroscopy of mono- and a few-layers-thick PtSe2
I. Yasuda, T. Kawada, H. Matsumoto, M. Kawaguchi, M. Hayashi
Appl. Phys. Exp. 16, 053005 (2023).

Takuya Kawada won the Unviersity of Tokyo, School of Science award！

Great work! Congratulations!!

Publication: Helically distorted orthorhombic Tungsten predicted to exhibit large spin Hall effect

Large intrinsic spin Hall conductivity in orthorhombic tungsten
T. Ishikawa, R. Akashi, K. Kubo, Y. Toga, K. Inukai, I. Rittaporn, M. Hayashi, S. Tsuneyuki
Phys. Rev. Mater. 7, 026202 (2023).
[Press release]

Haruo Kondo won the 18th Spintonics research division Best English presentation award!!

Place: The 83rd Japan Applied Physics Society (JSAP) autumn meeting.
Title: Pulsed Laser Induced Chirality Switching in Tellurium Thin Films
Congratulations!

Publication: Current induced domain walls in ferrimagnetic TbFeCo alloy

Reversal of current-induced domain wall motion in TbFeCo ferrimagnetic thin films across the magnetization compensation point M. Ishibashi, K. Yakushiji, M. Kawaguchi, A. Tsukamoto, S. Nakatsuji, M. Hayashi
Jpn. J. Appl. Phys. 62 013001 (2023).

2022

Takuya Kawada won the 53th JSAP young scientist presentation award!!

Place: The 83th Japan Applied Physics Society (JSAP) autumn meeting
Title: Spin-torque FMR induced by acoustic spin Hall effect
Congratulations!

Hiroki Matsumoto and Mio Ishibashi won the TSQS International Symposium's Best Poster Presentation ward!!

Place: 2nd International Symposium on Trans-scale Quantum Science
Title (H. Matsumoto)：Cavity magnetomechanics of surface acoustic waves with a synthetic antiferromagnet
Title (M. Ishibashi)：Error rate of a ferrimagnetic spin shift resist
Congratulations!

Hiroki Matsumoto won the JPS Student Presentation Award!!

Place: The Physical Society of Japan 2022 Autumn Meeting.
Title: Coupling between surface acoustic phonons and magnons in a synthetic antiferromagnet
Congratulations!

Takuya Kawada won the XPS Best Student Award!!

The Program of Excellence in Photon Science (XPS) (XPS) Final Examination（FE）
Congratulations!

Hiroki Matsumoto won the JPS Student Presentation Award!!

Place: The Physical Society of Japan 2022 (77th) Annual Meeting.
Title: Surface acoustic phonons in a two-dimensional phononic graphene.
Congratulations!

Publication: Spin magnetic moment current in Dirac materials

Spin Hall effect driven by the spin magnetic moment current in Dirac materials
Z. Chi, G. Qu, Y.-C. Lau, M. Kawaguchi, J. Fujimoto, K. Takanashi, M. Ogata, M. Hayashi
Phys. Rev. B 105, 214419 (2022).

Publication: Highly non-reciprocal transmission of surface acoustic waves

Large surface acoustic wave nonreciprocity in synthetic antiferromagnets
H. Matsumoto, T. Kawada, M. Ishibashi, M. Kawaguchi, M. Hayashi
Appl. Phys. Express 15, 063003 (2022).

Publication: Magnetic compensation in rare-earth baed ferrimagnetic alloy

Ferrimagnetic compensation and its thickness dependence in TbFeCo alloy thin films.
M. Ishibashi, K. Yakushiji, M. Kawaguchi, A. Tsukamoto, S. Nakatsuji, M. Hayashi
Appl. Phys. Lett. 120, 022405 (2022).

2021

Takuya Kawada won the JPS Student Presentation Award!!

Place: The Physical Society of Japan 2021 autumn meeting.
Title: Materials dependence of the acoustic spin Hall effect.
Congratulations!

Publication: Pt-Bi alloys for spin orbit torque three terminal devices

Charge–spin conversion in Pt_{1-x}Bi_{x} alloys for spin–orbit torque switching
Z. Chi, Y.-C. Lau, M. Kawaguchi, M. Hayashi
APL Mater. 9, 061111 (2021).

Publication: Helicity dependent photocurrent in metal/semimetal bilayers

Interface-enhanced helicity dependent photocurrent in metal/semimetal bilayers
H. Hirose, M. Kawaguchi, Y.-C. Lau, Z. Chi, F. Freimuth, K. Takanashi, M. Hayashi
Phys. Rev. B 103, 174437 (2021).

Publication: Polarized THz pulses from a spintronic THz emitter!

H. Niwa, N. Yoshikawa, M. Kawaguchi, M. Hayashi, R. Shimano
Optics Express 29, 13331 (2021).
[Editors' pick]

Naruo Ohga won the Unviersity of Tokyo, Faculty of Science award！

Great work! Congratulations!!

Publication: Machine learning and pattern recognition are used to determine the DMI from a single magnetic domain image!

Determination of the Dzyaloshinskii-Moriya interaction using pattern recognition and machine learning
M. Kawaguchi, K. Tanabe, K. Yamada, T. Sawa, S. Hasegawa, M Hayashi, Y. Nakatani
npj Computational Materials 7, 1 (2021).
[Press release]

Publication: First principles studies on the relation between the anomalous Hall and spin Hall effects in ferromagnets

First Principles Investigation of Anomalous Hall and Spin Hall Effects in Ferromagnetic CoPt
G. Qu, K. Nakamura, M. Hayashi
J. Phys. Soc. Jpn. 90, 024707 (2021).

Publication: Observation of the acoustic spin Hall effect in strong spin-orbit metals

Acoustic spin Hall effect in strong spin-orbit metals
T. Kawada, M. Kawaguchi, T. Funato, H. Kohno, M. Hayashi
Science Advances 7, eabd9697 (2021).
[Press release]

2020

Publication: Bismuth thin films emit light in the terahertz frequency range!

Terahertz Emission from Thin Films Induced by Excitation with Circularly Polarized Light
Y. Hirai, N. Yoshikawa, H. Hirose, M. Kawaguchi, M. Hayashi, R. Shimano
Phys. Rev. Appl. 14, 064015 (2020).
[Editors' suggestion]

Publication: Spin Hall effect of ferromagnets depends on their magnetization direction

Magnetization direction dependent spin Hall effect in ferromagnets
G. Qu, K. Nakamura, M. Hayashi
Phys. Rev. B 102, 144440 (2020).

Publication: Superconducting properties of W thin films on topological insulators

Concomitance of superconducting spin–orbit scattering length and normal state spin diffusion length in W on (Bi,Sb)2Te3
Y.-C. Lau, R. Akiyama, H. T. Hirose, R. Nakanishi, T. Terashima, S. Uji, S. Hasegawa, M. Hayashi
J. Phys. Mater. 3, 034001 (2020).

Hana Hirose and Takuya Kawada won the Unviersity of Tokyo, School of Science award！

Great work! Congratulations!!

Publication: Giant spin orbit torque found in systems with Dirac electrons

The spin Hall effect of Bi-Sb alloys driven by thermally excited Dirac-like electrons
Z. Chi, Y.-C. Lau, X. Xu, T. Ohkubo, K. Hono, M. Hayashi
Science Advances, 6, eaay2324 (2020).

Publication: Highly efficient spin orbit torque in sythetic antiferromagnets

Highly efficient spin-orbit torque in Pt/Co/Ir multilayers with antiferromagnetic interlayer exchange coupling
Y. Ishikuro, M. Kawaguchi, T. Taniguchi, M. Hayashi
Phys. Rev. B 101, 014404 (2020).

2019

Takuya Kawada selected as the Finalist of the "Best student presentation award" at MMM!

Place: 64th Annual Conference on Magnetism and Magnetic Materials (MMM) at Las Vegas.
Title: Surface acoustic wave induced DC spin current in spin-orbit heterostructures.
Congratulations!

Publication: Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers

Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers
Y.-C. Lau, Z. Chi, T. Taniguchi, M. Kawaguchi, G. Shibata, N. Kawamura, M. Suzuki, S. Fukami, A. Fujimori, H. Ohno, M. Hayashi
Phys. Rev. Mater. 3, 104419 (2019).

Publication: DMI modulation with current

Current induced modulation of interfacial Dzyaloshinskii-Moriya interaction
N. Kato, M. Kawaguchi, Y.-C. Lau, T. Kikuchi, Y. Nakatani, M. Hayashi
Phys. Rev. Lett. 122, 257205 (2019).

Publication: A giant acoustic planar Hall effect observed

Unidirectional planar Hall voltages induced by surface acoustic waves in ferromagnetic thin films
T. Kawada, M. Kawaguchi, M. Hayashi
Phys. Rev. B 99, 184435 (2019).

Publication: DMI and spin orbit torque at the Ir/Co interface

Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface
Y. Ishikuro, M. Kawaguchi, N. Kato, Y.-C. Lau, M. Hayashi
Phys. Rev. B 99, 134421 (2019).

Publication: Spin Hall effect from p-d hybridized orbitals in Co-Ga alloys

Spin Hall effect from 3d-4p hybridized orbitals
Y.-C. Lau, H. Lee, G. Qu, K. Nakamura, M. Hayashi
Phys. Rev. B 99, 064410 (2019).

2018

Hana Hirose won the 45th JSAP young scientist presentation award!!

Place: The 79th Japan Applied Physics Society (JSAP) autumn meeting.
Title: Material dependence of interfacial spin-momentum locked bands in metallic heterostructures
Congratulations!

Our paper was selected as a featured article!

Circular photogalvanic effect in Cu/Bi bilayers
H. Hirose, N. Ito, M. Kawaguchi, Y. C. Lau, M. Hayashi
Appl. Phys. Lett. 113, 222404 (2018).

See also Scilight for more information.

Publication: Spin orbit induced photocurrent found in Bi/Cu bilayer

Circular photogalvanic effect in Cu/Bi bilayers
H. Hirose, N. Ito, M. Kawaguchi, Y. C. Lau, M. Hayashi
Appl. Phys. Lett. 113, 222404 (2018).

Publication: Spin orbit torque detected optically

Optical Detection of Spin-Orbit Torque and Current-Induced Heating
Y. Marui, M. Kawaguchi, M. Hayashi
Appl. Phys. Express 11, 5 093001 (2018).

Hana Hirose won the Best presentation award!

Hana Hirose won the Best presentation award at the Condensed Matter Physics Summer School.
Congratulations!

Publication: Resistance of chiral domain walls

Domain-Wall Resistance in Cofeb-Based Heterostructures with Interface Dzyaloshinskii-Moriya Interaction
Y. Ishikuro, M. Kawaguchi, Y. C. Lau, Y. Nakatani, M. Hayashi
Appl. Phys. Express 11, 5 073001 (2018).

Publication: Spin Hall magnetoresistance in Pt/Co bilayers

Anomalous Spin Hall Magnetoresistance in Pt/Co Bilayers
M. Kawaguchi, D. Towa, Y. C. Lau, S. Takahashi, M. Hayashi
Appl. Phys. Lett. 112, 5 202405 (2018).

Naoaki Kato won the Unviersity of Tokyo, Faculty of Science award！

Great work! Congratulations!!