About us

Theoretical spintronics reserach group

last modified: 2022/07/13

We investigate theories of spintronic phenomena, such as spin Hall effect and spin torques.

People

Staff
[PI] Assistant professor Junji Fujimoto

Publications

Preprint

last modified:2022/09/26
  1. "Determination of spin relaxation time and spin diffusion length by oscillation of spin pumping signal" Junji Fujimoto, and Mamoru Matsuo, arXiv:1907.04639
  2. "The chirality-dependent second-order spin current in systems with time-reversal symmetry" Ryosuke Hirakida, Junji Fujimoto, and Masao Ogata, arXiv:2204.03263
  3. "Field theoretical approach to spin torques: Slonczewski torques" Junji Fujimoto, arXiv:2208.09581

Peer-reviewed

last modified: 2022/11/05
  1. "Dirac Liquid Theory: 2nd Order Perturbation Approach" Junji Fujimoto, Yuki Fuseya, and Kazumasa Miyake, J. Phys. Soc. Jpn. Suppl. 81, SB042 (2012).
  2. "Ultraviolet divergence and Ward-Takahashi identity in a two-dimensional Dirac electron system with short-range impurities" Junji Fujimoto, Akio Sakai, and Hiroshi Kohno, Phys. Rev. B 87, 085437 (2013).
  3. "Transport Properties of Dirac Ferromagnet" Junji Fujimoto, and Hiroshi Kohno, Phys. Rev. B 90, 214418 (2014). arXiv:1404.4741
  4. "Strong Bias Effect on Voltage-Driven Torque at Epitaxial Fe-MgO Interface" Shinji Miwa, Junji Fujimoto, Philipp Risius, Kohei Nawaoka, Minori Goto, and Yoshishige Suzuki, Phys. Rev. X 7, 031018 (2017).
  5. "Intrinsic and Extrinsic Spin Hall Effects of Dirac Electrons" Takaaki Fukazawa, Hiroshi Kohno, and Junji Fujimoto, J. Phys. Soc. Jpn. 86, 094704 (2017). arXiv:1705.03605
  6. "Transport Coefficients of Dirac Ferromagnet: Effects of Vertex Corrections" Junji Fujimoto, Phys. Rev. B 97, 104421 (2018). arXiv:1708.06105
  7. "Nonlocal spin-charge conversion via Rashba spin-orbit interaction" Junji Fujimoto, and Gen Tatara, Phys. Rev. B 99, 054407 (2019). arXiv:1812.08884
  8. "Alternating current-induced interfacial spin-transfer torque" Junji Fujimoto, and Mamoru Matsuo, Phys. Rev. B 100, 220402(R) (2019). arXiv:1910.01306
  9. "Valley-Dependent Spin Transport in Monolayer Transition-Metal Dichalcogenides" Yuya Ominato, Junji Fujimoto, and Mamoru Matsuo, Phys. Rev. B 100, 220402(R) (2019). arXiv:2001.08670
  10. "Magnon current generation by dynamical distortion" Junji Fujimoto, and Mamoru Matsuo, Phys. Rev. B 102, 020406(R) (2020). arXiv:2004.14707
  11. "Adiabatic and nonadiabatic spin-transfer torques in antiferromagnets" Junji Fujimoto, Phys. Rev. B 103, 014436 (2021). arXiv:2009.02686
  12. "Generation of current vortex by spin current in Rashba systems" Florian Lange, Satoshi Ejima, Junji Fujimoto, Tomonori Shirakawa, Holger Fehske, Seiji Yunoki, and Sadamichi Maekawa, Phys. Rev. Lett. 126, 157202 (2021). arXiv:2011.08574
  13. "Zeeman coupling and Dzyaloshinskii-Moriya interaction driven by electric current vorticity" Junji Fujimoto, Wataru Koshibae, Mamoru Matsuo, and Sadamichi Maekawa, Phys. Rev. B 103, L220402 (2021).
  14. "Spin-charge conversion and current vortex in spin-orbit coupled systems" (invited) Junji Fujimoto, Florian Lange, Satoshi Ejima, Tomonori Shirakawa, Holger Fehske, Seiji Yunoki, and Sadamichi Maekawa, APL Materials 9, 060904 (2021). arXiv:2103.06540
  15. "Skyrmion Creation and Annihilation by Electric Current Vorticity" (invited) Junji Fujimoto, Hiroshi Funaki, Wataru Koshibae, Mamoru Matsuo, and Sadamichi Maekawa, IEEE Transactions on Magnetics (2022).
  16. "Thermoelectric power generation via transverse thermo-spin conversions" (invited) (Featured) (Scilight) Junji Fujimoto, and Masao Ogata, Appl. Phys. Lett. 120, 122404 (2022).
  17. "Seebeck effect of Dirac electrons" Junji Fujimoto, and Masao Ogata, J. Phys. Soc. Jpn. 91, 054603 (2022). arXiv:2106.04050
  18. "Spin Hall effect driven by the spin magnetic moment current in Dirac materials" Zhendong Chi, Guanxiong Qu, Yong-Chang Lau, Masashi Kawaguchi, Junji Fujimoto, Koki Takanashi, Masao Ogata, and Masamitsu Hayashi, Phys. Rev. B 105, 214419 (2022). arXiv:2205.11669

Presentations

last modified: 2022/09/26

Poster presentation

  1. "Dirac Liquid Theory: 2nd Order Perturbation Approach" Junji Fujimoto, Yuki Fuseya, and Kazumasa Miyake, TOKIMEKI 2011 International workshop on heavy fermions, Osaka, Japan, 2011.
  2. "Transport properties of Dirac Ferromagnet" Junji Fujimoto, and Hiroshi Kohno, the 7th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductor (PASPS-VII), Eindhoven, The Netherlands, 2012.
  3. "Transport properties of Dirac Ferromagnet" Junji Fujimoto, and Hiroshi Kohno, The 8th International Symposium on Metallic Multilayers (MML2013), Kyoto, Japan, 2013.
  4. "Transport properties of Dirac Ferromagnet" Junji Fujimoto, and Hiroshi Kohno, Concepts in Spintronics, KITP(UCSB), California, US, 2013.
  5. "Effects of Dirac points on Rashba spin-orbit torques" Junji Fujimoto, and Hiroshi Kohno, New Perspectives in Spintronic and Mesoscopic Physics, Kashiwa, Japan, 2015.
  6. "Effects of skew scattering on non-dissipative transport properties" Junji Fujimoto, and Hiroshi Kohno, International workshop on nano-spin conversion science & quantum spin dynamics, University of Tokyo, Japan, 2016.
  7. "Non-local spin-to-charge conversion via Rashba spin-orbit coupling" Junji Fujimoto, and Gen Tatara, One-Day Symposium on Spintronic Properties of Graphene and Related 2D Materials, University of Tokyo, Japan, 2018.
  8. "Magnetic skyrmion creation by electron hydrodynamic effects" Junji Fujimoto, Wataru Koshibae, Hirhoshi Funaki, Mamoru Matsuo, and Sadamichi Maekawa, 29th International Conference on Low Temperature Physics, Sappro Convention Center, Japan, 2022.

Oral presentation

  1. "Microscopic calculation of Rashba spin-orbit torques" Junji Fujimoto, and Hiroshi Kohno, APS March Meeting 2015, San Antonio, TX, US, Mar. 2015.
  2. "Effects of non-local emergent electromagnetic fields driven by Rashba spin-orbit coupling" Junji Fujimoto, and Gen Tatara, APS March Meeting 2018, Los Angels, CA, US, Mar. 2018.
  3. "Zeeman Coupling and Dzyaloshinskii-Moriya Interaction driven by Electric Current Vorticity" invited Junji Fujimoto, Wataru Koshibae, Matsuo Matsuo, and Sadamichi Maekawa, APW-RIKEN-Tsinghua-Kavli workshop, oneline, Sept. 2020.
  4. "Spin-charge conversion and current vortex" invited Junji Fujimoto, APW-RIKEN-Tsinghua-Kavli workshop, oneline, Oct. 2021.
  5. "Skyrmion Creation and Annihilation by Electric Current Vorticity" invited Junji Fujimoto, Hiroshi Funaki, Wataru Koshibae, Matsuo Matsuo, and Sadamichi Maekawa, The 15th Joint MMM-INTERMAG Conference, oneline, Jan. 2022.

Contact Information

Address
Shimo-Okubo 255, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
Office
Building of Reserarch & Project-2, 2nd floor #2-3, Shimo-Okubo 255, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
Email address
Email me in English or Japanese.