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FUJIMOTO Junji
| Mathematics, Electronics and Informatics Division | Assistant Professor |
| Department of Electrical Engineering,Electronics, and Applied Physics |
Performance information
■ Paper- Gyro-spintronic material science using vorticity gradient in solids
Yukio Nozaki; Hiroaki Sukegawa; Shinichi Watanabe; Seiji Yunoki; Taisuke Horaguchi; Hayato Nakayama; Kazuto Yamanoi; Zhenchao Wen; Cong He; Jieyuan Song; Tadakatsu Ohkubo; Seiji Mitani; Kazuki Maezawa; Daichi Nishikawa; Shun Fujii; Mamoru Matsuo; Junji Fujimoto; Sadamichi Maekawa
Science and Technology of Advanced Materials, Volume：26, Number：1, Feb. 2025
Informa UK Limited, Scientific journal
DOI：https://doi.org/10.1080/14686996.2024.2428153
DOI ID：10.1080/14686996.2024.2428153, ISSN：1468-6996, eISSN：1878-5514 - Anti-Poiseuille flow by spin Hall effect
Junji Fujimoto; Wataru Koshibae; Sadamichi Maekawa
PNAS Nexus, Volume：3, Number：12, First page：pgae547, Dec. 2024, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1093/pnasnexus/pgae547
DOI：https://doi.org/10.48550/arXiv.2303.17234
DOI ID：10.1093/pnasnexus/pgae547, ORCID：173505060, 共同研究・競争的資金等ID：43195180;48401420 - Microscopic theory of spin Nernst effect
Junji Fujimoto; Taiki Matsushita; Masao Ogata
Physical Review B, Nov. 2024, [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.110.174411
DOI ID：10.1103/PhysRevB.110.174411, ORCID：171187466 - Anisotropy of the spin Hall effect in a Dirac ferromagnet
Guanxiong Qu; Masamitsu Hayashi; Masao Ogata; Junji Fujimoto
Physical Review B, Aug. 2023, [Reviewed], [Last, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.108.064404
DOI ID：10.1103/PhysRevB.108.064404, ORCID：140019205 - A large modulation of spin pumping using magnetic phase transitions in single crystalline dysprosium
Kazuto Yamanoi; Yuri Sakakibara; Junji Fujimoto; Mamoru Matsuo; Yukio Nozaki
Applied Physics Express, Volume：16, Number：6, First page：063004, Last page：063004, Jun. 2023, [Reviewed]
Abstract
We report a large modulation of spin pumping using temperature-induced magnetic phase transitions in c-axis oriented single crystalline dysprosium (Dy). From the temperature variation of the magnetic susceptibility, transitions from paramagnetic (PM) to ferromagnetic (FM) phases via antiferromagnetic (AFM) phase are clearly observed in the Dy. Unlike polycrystalline Dy, the spin pumping of both PM- and AFM-Dy are strongly suppressed owing to the increased non-dissipative backflow of spin current by the long-range spin transport, although two orders of magnitude difference exist between FM- and AFM-phases.
IOP Publishing, Scientific journal
DOI：https://doi.org/10.35848/1882-0786/acde67
DOI ID：10.35848/1882-0786/acde67, ISSN：1882-0778, eISSN：1882-0786 - Chirality-dependent second-order spin current in systems with time-reversal symmetry
Ryosuke Hirakida; Junji Fujimoto; Masao Ogata
Physical Review B, Aug. 2022, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.106.085127
DOI ID：10.1103/PhysRevB.106.085127, ORCID：117359244 - 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; Masamitsu Hayashi
Physical Review B, Jun. 2022, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.105.214419
DOI ID：10.1103/PhysRevB.105.214419, ORCID：114432165 - Seebeck Effect of Dirac Electrons
Junji Fujimoto; Masao Ogata
Journal of the Physical Society of Japan, May 2022, [Reviewed], [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.7566/JPSJ.91.054603
DOI ID：10.7566/JPSJ.91.054603, ORCID：111854665 - Thermoelectric power generation via transverse thermo-spin conversions
Junji Fujimoto; Masao Ogata
Applied Physics Letters, Volume：120, Number：12, First page：122404, Last page：122404, Mar. 2022, [Reviewed], [Invited], [Lead, Corresponding]
{AIP} Publishing, Scientific journal
DOI：https://doi.org/10.1063/5.0077158
DOI ID：10.1063/5.0077158, ORCID：110584469 - Skyrmion Creation and Annihilation by Electric Current Vorticity
Junji Fujimoto; Hiroshi Funaki; Wataru Koshibae; Mamoru Matsuo; Sadamichi Maekawa
IEEE Transactions on Magnetics, Volume：58, Number：8, First page：1, Last page：1, 2022, [Reviewed], [Invited], [Lead, Corresponding]
Institute of Electrical and Electronics Engineers ({IEEE}), Scientific journal
DOI：https://doi.org/10.1109/tmag.2021.3139638
DOI ID：10.1109/tmag.2021.3139638, ISSN：0018-9464, eISSN：1941-0069, ORCID：109727060 - Spin–charge conversion and current vortex in spin–orbit coupled systems
Junji Fujimoto; Florian Lange; Satoshi Ejima; Tomonori Shirakawa; Holger Fehske; Seiji Yunoki; Sadamichi Maekawa
APL Materials, Volume：9, Number：6, First page：060904, Last page：060904, Jun. 2021, [Reviewed], [Invited], [Lead, Corresponding]
AIP Publishing, Scientific journal
DOI：https://doi.org/10.1063/5.0049882
DOI ID：10.1063/5.0049882, eISSN：2166-532X - Zeeman coupling and Dzyaloshinskii-Moriya interaction driven by electric current vorticity
Junji Fujimoto; Wataru Koshibae; Mamoru Matsuo; Sadamichi Maekawa
Physical Review B, Volume：103, Number：22, Jun. 2021, [Reviewed], [Lead, Corresponding]
American Physical Society (APS), Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.103.L220402
DOI ID：10.1103/PhysRevB.103.L220402, ISSN：2469-9950, eISSN：2469-9969, ORCID：94796337 - Generation of Current Vortex by Spin Current in Rashba Systems
Florian Lange; Satoshi Ejima; Junji Fujimoto; Tomonori Shirakawa; Holger Fehske; Seiji Yunoki; Sadamichi Maekawa
Physical Review Letters, Volume：126, Number：15, Apr. 2021, [Reviewed]
American Physical Society (APS), Scientific journal
DOI：https://doi.org/10.1103/PhysRevLett.126.157202
DOI ID：10.1103/PhysRevLett.126.157202, ISSN：0031-9007, eISSN：1079-7114, ORCID：92084975 - Adiabatic and nonadiabatic spin-transfer torques in antiferromagnets
Junji Fujimoto
Physical Review B, Jan. 2021, [Reviewed], [Lead, Last, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.103.014436
DOI ID：10.1103/PhysRevB.103.014436, ORCID：87466177 - Magnon current generation by dynamical distortion
Junji Fujimoto; Mamoru Matsuo
Physical Review B, Jul. 2020, [Reviewed], [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.102.020406
DOI ID：10.1103/PhysRevB.102.020406, ORCID：77474998 - Valley-Dependent Spin Transport in Monolayer Transition-Metal Dichalcogenides
Yuya Ominato; Junji Fujimoto; Mamoru Matsuo
Physical Review Letters, Apr. 2020, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevLett.124.166803
DOI ID：10.1103/PhysRevLett.124.166803, ORCID：72685124 - Alternating current-induced interfacial spin-transfer torque
Junji Fujimoto; Mamoru Matsuo
Physical Review B, Volume：100, Number：22, Dec. 2019, [Reviewed], [Lead, Corresponding]
American Physical Society ({APS}), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.100.220402
DOI ID：10.1103/PhysRevB.100.220402, ISSN：2469-9969, ORCID：65554316 - Nonlocal spin-charge conversion via Rashba spin-orbit interaction
Fujimoto, Junji; Tatara, Gen
Phys. Rev. B, Volume：99, First page：054407, Last page：054407, 2019, [Reviewed], [Lead, Corresponding]
American Physical Society, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.99.054407
DOI ID：10.1103/PhysRevB.99.054407, ORCID：56162839 - Transport coefficients of Dirac ferromagnet: Effects of vertex corrections
Fujimoto, Junji
Phys. Rev. B, Volume：97, First page：104421, Last page：104421, 2018, [Reviewed], [Lead, Last, Corresponding]
American Physical Society, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.97.104421
DOI ID：10.1103/PhysRevB.97.104421, ORCID：43635526 - Strong Bias Effect on Voltage-Driven Torque at Epitaxial Fe-MgO Interface
Miwa, Shinji; Fujimoto, Junji; Risius, Philipp; Nawaoka, Kohei; Goto, Minori; Suzuki, Yoshishige
Phys. Rev. X, Volume：7, First page：031018, Last page：031018, 2017, [Reviewed]
American Physical Society, Scientific journal
DOI：https://doi.org/10.1103/PhysRevX.7.031018
DOI ID：10.1103/PhysRevX.7.031018, ORCID：38431827 - Intrinsic and Extrinsic Spin Hall Effects of Dirac Electrons
Takaaki Fukazawa; Hiroshi Kohno; Junji Fujimoto
Journal of the Physical Society of Japan, Volume：86, Number：9, First page：094704, Last page：094704, 2017, [Reviewed], [Last, Corresponding], ［Domestic magazine］
Scientific journal
DOI：https://doi.org/10.7566/JPSJ.86.094704
DOI ID：10.7566/JPSJ.86.094704, ORCID：38431826, arXiv ID：arXiv:1705.03605 - Transport properties of Dirac ferromagnet
Fujimoto, Junji; Kohno, Hiroshi
Phys. Rev. B, Volume：90, First page：214418, Last page：214418, 2014, [Reviewed], [Lead, Corresponding]
American Physical Society, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.90.214418
DOI ID：10.1103/PhysRevB.90.214418, ORCID：38431833, arXiv ID：arXiv:1404.4741 - Ultraviolet divergence and Ward-Takahashi identity in a two-dimensional Dirac electron system with short-range impurities
Fujimoto, Junji; Sakai, Akio; Kohno, Hiroshi
Phys. Rev. B, Volume：87, First page：085437, Last page：085437, 2013, [Reviewed], [Lead]
American Physical Society, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.87.085437
DOI ID：10.1103/PhysRevB.87.085437, ORCID：38431835 - Dirac Liquid Theory: Second Order Perturbation Approach
Fujimoto Junji; Fuseya Yuki; Miyake Kazumasa
Journal of the Physical Society of Japan, Volume：81, 2012, [Reviewed], [Lead, Corresponding]
The Physical Society of Japan, English
DOI：https://doi.org/10.1143/JPSJS.81SB.SB042
DOI ID：10.1143/JPSJS.81SB.SB042, ISSN：0031-9015, CiNii Articles ID：160000037950
- Intrinsic spin Nernst effect in topological Dirac and magnetic Weyl semimetals
Taiki Matsushita; Akihiro Ozawa; Yasufumi Araki; Junji Fujimoto; Masatoshi Sato
20 Sep. 2024
We investigate the intrinsic spin Nernst effect (SNE), a transverse spin
current induced by temperature gradients, in topological Dirac semimetals
(TDSMs) and magnetic Weyl semimetals (MWSMs) with Ising spin-orbit coupling.
The intrinsic SNE is described by the spin Berry curvature, which reflects the
geometric nature of TDSMs and MWSMs. We clarified that the intrinsic SNE
becomes significant when the Fermi energy is near, but slightly deviates from,
the energy of the point nodes. In this situation, Bloch electrons with strong
spin Berry curvature contribute to the SNE while avoiding carrier compensation
between electrons and holes. We found that in TDSMs with small Fermi surfaces,
the spin Nernst angle, which measures the efficiency of the SNE, is larger than
that observed in heavy metals. This suggests that TDSMs with small Fermi
surfaces can achieve efficient heat-to-spin current conversion. In MWSMs,
variation in the magnitude of the exchange coupling with magnetic moments
significantly changes the SNE, affecting both the direction and magnitude of
the spin Nernst current. This implies that ferromagnetic transitions can be
used to reverse the spin Nernst current. These results provide the fundamentals
for future topological spin caloritronics.
arXiv ID：arXiv:2409.13225
- 9pAX-1 Anomalous Hall effect in Weyl semimetal
FUJIMOTO Junji; KOHNO Hiroshi
Meeting abstracts of the Physical Society of Japan, Aug. 2014, The Physical Society of Japan (JPS)
Aug. 2014 - Aug. 2014, Japanese - 27aPS-27 Effects of Vertex Corrections on Transport Coefficients of a Dirac Ferromagnet
FUJIMOTO Junji; KOHNO Hiroshi
Meeting abstracts of the Physical Society of Japan, Mar. 2014, The Physical Society of Japan (JPS)
Mar. 2014 - Mar. 2014, Japanese - Gilbert damping torque of Dirac ferromagnet
FUJIMOTO Junji; KOHNO Hiroshi
Meeting abstracts of the Physical Society of Japan, Aug. 2013, The Physical Society of Japan (JPS)
Aug. 2013 - Aug. 2013, Japanese - 26aPS-10 Oder Parameters of Dirac Ferromagnet : Analysis by Self-consistent Equation
FUJIMOTO Junji; KOHNO Hiroshi
Meeting abstracts of the Physical Society of Japan, Mar. 2013, The Physical Society of Japan (JPS)
Mar. 2013 - Mar. 2013, Japanese - 20pCC-7 Transport Properties of a Dirac Ferromagnet II
FUJIMOTO Junji; KOHNO Hiroshi
Meeting abstracts of the Physical Society of Japan, Aug. 2012, The Physical Society of Japan (JPS)
Aug. 2012 - Aug. 2012, Japanese - 25aSA-13 Transport Properties of a Dirac Ferromagnet
FUJIMOTO Junji; KOHONO Hiroshi
Meeting abstracts of the Physical Society of Japan, Mar. 2012, The Physical Society of Japan (JPS)
Mar. 2012 - Mar. 2012, Japanese - 26pBD-12 Ultraviolet Divergence in the Impurity Effect in 2D Dirac Electron System
Fujimoto J.; Sakai A.; Kohno H.
Meeting abstracts of the Physical Society of Japan, Mar. 2012, The Physical Society of Japan (JPS)
Mar. 2012 - Mar. 2012, Japanese - 26pPSA-30 Dirac Liquid : Perturbation Theory in 2nd-Order
Fujimoto Junji; Fuseya Yuki; Miyake Kazumasa
Meeting abstracts of the Physical Society of Japan, Mar. 2011, The Physical Society of Japan (JPS)
Mar. 2011 - Mar. 2011, Japanese
■ Affiliated academic society
- Jan. 2023 - Present, The Japan Society of Applied Physics
- 2011 - Present, The Physical Society of Japan
- Nonreciprocity due to spin-vorticity coupling in solids
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2024 - 31 Mar. 2027
Institute of Physical and Chemical Research
Grant amount(Total)：18200000, Direct funding：14000000, Indirect funding：4200000
Grant number：24K00576
論文ID：48688467 - Effects of electric current vorticity on magnetism
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, 01 Apr. 2022 - 31 Mar. 2025
The University of Tokyo
Grant amount(Total)：4030000, Direct funding：3100000, Indirect funding：930000
Grant number：22K13997
論文ID：48688467 - ディラック方程式に基づく強磁性体の理論的研究
01 Apr. 2013 - 31 Mar. 2015
Grant amount(Total)：2200000, Direct funding：2200000
Grant number：13J03750