Spintronics Group Papers (2021-)

2026

1. Xueyao Hou, Keita Ito, Varun K. Kushwaha, Takumi Yamazaki, Junwei Gu, Zhenchao Wen, Keisuke Masuda, Jun Okabayashi, Shoya Sakamoto and Takeshi Seki,
   "Amorphous Tungsten Driving Extraordinary Long-Range Interlayer Exchange Coupling and Large Spin-Orbit Torque"
   Adv. Electron. Mater. in-press (2026).
   


2. Rohiteswar Mondal, Zhenchao Wen, Chandrasekhar Murapaka, Seiji Mitani, Hiroaki Sukegawa, Quang Le, Xiaoyong Liu, Brian York, Maki Maeda,
   "Enhanced spin-orbit torque efficiency via interface engineering in BiSb/X/CoFeB (X = Ge, NiAl, NiFeGe) topological heterostructures"
   J. Appl. Phys. 139, 183903-1~8 (2026).
   

2025

1. Cong He, Zhenchao Wen, Jun Okabayashi, Yoshio Miura, Tianyi Ma, Tadakatsu Ohkubo, Takeshi Seki, Hiroaki Sukegawa and Seiji Mitani,
   "Evidence for single variant in altermagnetic RuO₂(101) thin films"
   Nat. Commun. 16, 8235-1~9 (2025).
   Open access
   


2. Talluri Manoj, Venkat Mattela, Akshay Kumar Salimath, Sanghamitra Debroy, Tarun Raju Kakinada, M. S. Devapriya, Arabinda Haldar, Zhenchao Wen, Hiroaki Sukegawa, Seiji Mitani, and Chandrasekhar Murapaka,
   "Thickness dependent spin to charge interconversion efficiency in polycrystalline BiSb layers deposited on Si substrate"
   J. Appl. Phys. 138, 053903-1~9 (2025).
   Open access
   


3. Rombang Rizky Sihombing, Thomas Scheike, Jun Uzuhashi, Hideyuki Yasufuku, Tadakatsu Ohkubo, Zhenchao Wen, Seiji Mitani, Hiroaki Sukegawa,
   "High entropy oxide epitaxial films with interface perpendicular magnetic anisotropy and tunnel magnetoresistance effect toward spintronic applications"
   Mater. Today 88, 12-23 (2025).
   Open access
   


4. Keisuke Masuda, Thomas Scheike, Hiroaki Sukegawa, Yusuke Kozuka, Seiji Mitani, and Yoshio Miura,
   "Theory for tunnel magnetoresistance oscillation"
   Phys. Rev. B 111, L220406-1~6 (2025).
   Selected as Editors' suggestion
   Open access
   


5. Hayato Nakayama, Taisuke Horaguchi, Jun Uzuhashi, Cong He, Hiroaki Sukegawa, Tadakatsu Ohkubo, Seiji Mitani, Kazuto Yamanoi, and Yukio Nozaki,
   "Reversal of Spin-torque Polarity with Inverting Current Vorticity in Composition-graded Layer at the Ti/W Interface"
   Adv. Electron. Mater. 11, 2400797-1~9 (2025).
   Inside Front Cover: Adv. Electron. Mater. 7/2025
   Open access
   


6. Taisuke Horaguchi, Cong He, Zhenchao Wen, Hayato Nakayama, Tadakatsu Ohkubo, Seiji Mitani, Hiroaki Sukegawa, Junji Fujimoto, Kazuto Yamanoi, Mamoru Matsuo, and Yukio Nozaki,
   "Nanometer-thick Si/Al gradient materials for spin torque generation"
   Sci. Adv. 11, eadr9481-1~7 (2025).
   Open access
   


7. Hiroki Koizumi, Zhenchao Wen, Jun Uzuhashi, Tadakatsu Ohkubo, Hiroaki Sukegawa and Seiji Mitani,
   "Interface perpendicular magnetic anisotropy in heterostructures consisting of CoFeB and conductive rock-salt Li-Ti-O"
   J. Phys. D: Appl. Phys. 58, 16LT01-1~5 (2025).
   


8. 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, and Sadamichi Maekawa,
   "Gyro-spintronic material science using vorticity gradient in solids"
   Sci. Technol. Adv. Mater. 26, 2428153-1~39 (2025).
   Open access
   


9. Rombang Rizky Sihombing, Thomas Scheike, Jun Uzuhashi, Tadakatsu Ohkubo, Zhenchao Wen, Seiji Mitani, and Hiroaki Sukegawa,
   "Enhanced tunnel magnetoresistance of Fe/MgGa₂O₄/Fe(001) magnetic tunnel junctions by interface-tuning with atomic scale MgO insertion layers"
   Appl. Phys. Lett. 126, 022407-1~7 (2025).
   Selected as Editor's Pick
   Open access
   

2024

1. Yuki Iida, Qingyi Xiang, Thomas Scheike, Zhenchao Wen, Jun Okabayashi (Corresponding author), Jun Uzuhashi, Tadakatsu Ohkubo, Kazuhiro Hono, Hiroaki Sukegawa, and Seiji Mitani,
   "Large perpendicular magnetic anisotropy at Fe/rock-salt-type Cr-oxide interface synthesized via oxygen-driven chemical layer exchange process"
   APL Mater. 12, 111116-1~9 (2024).
   


2. Jieyuan Song, Thomas Scheike, Cong He, Zhenchao Wen, Tadakatsu Ohkubo, Kwangseok Kim, Hiroaki Sukegawa, and Seiji Mitani,
   "Incommensurate superlattice modulation surviving down to an atomic scale in sputter-deposited Co/Pt(111) epitaxial multilayered films"
   APL Mater. 12, 101120-1~7 (2024).
   


3. Mouli Roy-Chowdhury, Cong He, Ke Tang, Hiroki Koizumi, Zhenchao Wen, Subhash Thota, Hiroaki Sukegawa, Tadakatsu Ohkubo and Seiji Mitani,
   "Conductive single-phase SrMoO₃ epitaxial films synthesized in pure Ar ambience via plasma-assisted radio frequency sputtering"
   Sci. Technol. Adv. Mater. 25, 2378684-1~10 (2024).
   


4. Talluri Manoj, Zhenchao Wen, Jun Uzuhashi, Tadakatsu Ohkubo, Hiroaki Sukegawa, Chandrasekhar Murapaka, Brian York, Xiaoyong Liu, Quang Le, and Seiji Mitani,
   "Spin-Orbit Torque Modulated by Interface Chemistry in Topological BiSb/NiFe Bilayers with Titanium Insertion"
   ACS Appl. Electron. Mater. 6, 4269–4276 (2024).
   


5. Shoki Nezu, Thomas Scheike, Hiroaki Sukegawa, and Koji Sekiguchi,
   "Unconventional parametric spin-wave pumping in single-crystal iron films"
   Phys. Rev. B 109, 184402-1~9 (2024).
   


6. Ke Tang, Cong He, Zhenchao Wen, Hiroaki Sukegawa, Tadakatsu Ohkubo, Yukio Nozaki, Seiji Mitani,
   "Enhanced orbital torque efficiency in nonequilibrium Ru₅₀Mo₅₀(0001) alloy epitaxial thin films"
   APL Mater. 12, 031131-1~7 (2024).
   

2023

1. Yuto Shibata, Kenta Sato, Hiroaki Sukegawa, and Hideo Kaiju,
   "Large magnetocapacitance of up to 456% at room temperature in FeCo/MgAl₂O₄/FeCo(001) magnetic tunnel junctions"
   Appl. Phys. Express 16, 113003-1~6 (2023).
   


2. Atsufumi Hirohata, David C. Lloyd, Takahide Kubota, Takeshi Seki, Koki Takanashi, Hiroaki Sukegawa, Zhenchao Wen, Seiji Mitani, and Hiroki Koizumi,
   "Antiferromagnetic Films and Their Applications"
   IEEE Access 11, 117443~117459 (2023).
   


3. Cong He, Keisuke Masuda, Jieyuan Song, Thomas Scheike, Zhenchao Wen, Yoshio Miura, Tadakatsu Ohkubo, Kazuhiro Hono, Seiji Mitani, and Hiroaki Sukegawa,
   "Nano-crystal domains in Co-based fcc(111) epitaxial magnetic junctions and their impact on tunnel magnetoresistance"
   Acta Mater. 261, 119394-1~14 (2023).
   


4. Jieyuan Song, Cong He, Thomas Scheike, Zhenchao Wen, Hiroaki Sukegawa, Tadakatsu Ohkubo, Yukio Nozaki, and Seiji Mitani,
   "Charge-to-spin conversion in fully epitaxial Ru/Cu hybrid nanolayers with interface control"
   Nanotechnology 34, 365704-1~10 (2023).
   


5. Hayato Nakayama, Taisuke Horaguchi, Cong He, Hiroaki Sukegawa, Tadakatsu Ohkubo, Seiji Mitani, Kazuto Yamanoi, and Yukio Nozaki,
   "Spin-torque generation using a compositional gradient at the interface between titanium and tungsten thin films"
   Phys. Rev. B 107, 174416-1~9 (2023).
   


6. Thomas Scheike, Zhenchao Wen, Hiroaki Sukegawa, and Seiji Mitani,
   "631% room temperature tunnel magnetoresistance with large oscillation effect in CoFe/MgO/CoFe(001) junctions"
   Appl. Phys. Lett. 122, 112404-1~6 (2023).
   Selected as Featured Article
   Open access
   

2022

1. Keisuke Masuda, Hiroyoshi Itoh, Yoshiaki Sonobe, Hiroaki Sukegawa, Seiji Mitani, and Yoshio Miura,
   "Band-folding-driven high tunnel magnetoresistance ratios in (111)-oriented junctions with SrTiO₃ barriers"
   Phys. Rev. B 106, 134438-1~7 (2022).
   


2. Ke Tang, Zhenchao Wen, Hiroaki Sukegawa, Takeshi Seki, and Seiji Mitani,
   "Elemental Doping and Interface Effects on Spin–Orbit Torques in CoSi-Based Topological Semimetal Thin Films"
   Adv. Mater. Interfaces 9, 2201332-1~7 (2022).
   


3. Kenta Sato, Hiroaki Sukegawa, Kentaro Ogata, Gang Xiao, and Hideo Kaiju,
   "Large magnetocapacitance beyond 420% in epitaxial magnetic tunnel junctions with an MgAl₂O₄ barrier"
   Sci. Rep. 12, 7190-1~10 (2022).
   Open access
   


4. S. Nezu, T. Scheike, H. Sukegawa, and K. Sekiguchi,
   "Propagating backward-volume spin waves in epitaxial Fe films"
   AIP Advances 12, 035320 (2022).
   


5. Thomas Scheike, Zhenchao Wen, Hiroaki Sukegawa, and Seiji Mitani,
   "Enhanced tunnel magnetoresistance in Fe/Mg₄Al-Ox/Fe(001) magnetic tunnel junctions"
   Appl. Phys. Lett. 120, 032404-1~4 (2022).
   Open access
   Selected as Editor's Pick
   (arXiv 2112.09910)
   

2021

1. Hiroshige Onoda, Hiroaki Sukegawa, Jun-Ichiro Inoue, and Hideto Yanagihara,
   "Strain Engineering of Magnetic Anisotropy in Epitaxial Films of Cobalt Ferrite"
   Adv. Mater. Interfaces 8, 2101034-1~6 (2021).
   Selected as Adv. Mater. Interfaces Frontispiece, volume 8, Issue 23, 8, Dec. 2021
   https://doi.org/10.1002/admi.202170135
   


2. Muftah Al-Mahdawi, Qingyi Xiang, Yoshio Miura, Mohamed Belmoubarik, Keisuke Masuda, Shinya Kasai, Hiroaki Sukegawa, and Seiji Mitani,
   "Quantum-well tunneling anisotropic magnetoresistance above room temperature"
   Phys. Rev. B 103, L180408-1~6 (2021).
   


3. Ke Tang, Yong-Chang Lau, Kenji Nawa, Zhenchao Wen, Qingyi Xiang, Hiroaki Sukegawa, Takeshi Seki, Yoshio Miura, Koki Takanashi, and Seiji Mitani,
   "Spin Hall effect in a spin-1 chiral semimetal"
   Phys. Rev. Research 3, 033101-1~10 (2021).
   


4. Kelvin Elphick, William Frost, Marjan Samiepour, Takahide Kubota, Koki Takanashi, Hiroki Sukegawa, Seiji Mitani, and Atsufumi Hirohata,
   "Heusler alloys for spintronic devices: review on recent development and future perspectives"
   Sci. Technol. Adv. Mater. 22 (1), 235-271 (2021).
   STAM Altmetrics Award for 2021
   


5. Keisuke Masuda, Hiroyoshi Itoh, Yoshiaki Sonobe, Hiroaki Sukegawa, Seiji Mitani, and Yoshio Miura,
   "Interfacial giant tunnel magnetoresistance and bulk-induced large perpendicular magnetic anisotropy in (111)-oriented junctions with fcc ferromagnetic alloys: A first-principles study"
   Phys. Rev. B 103, 064427-1~10 (2021).
   


6. Ke Tang, Zhenchao Wen, Yong-Chang Lau, Hiroaki Sukegawa, Takeshi Seki, and Seiji Mitani,
   "Magnetization switching induced by spin–orbit torque from Co₂MnGa magnetic Weyl semimetal thin films"
   Appl. Phys. Lett. 118, 062402-1~6 (2021).
   Selected as Featured Article
   Selected as Applied Physics Letters Cover, Volume 118, Issue 6, 8 Feb. 2021
   


7. Thomas Scheike, Qingyi Xiang, Zhenchao Wen, Hiroaki Sukegawa, Tadakatsu Ohkubo, Kazuhiro Hono, and Seiji Mitani,
   "Exceeding 400% tunnel magnetoresistance at room temperature in epitaxial Fe/MgO/Fe(001) spin-valve-type magnetic tunnel junctions"
   Appl. Phys. Lett. 118, 042411-1~6 (2021).
   Selected as Featured Article
   Selected as Scilight (https://aip.scitation.org/doi/full/10.1063/10.0003487, DOI: 10.1063/10.0003487)
   


8. N. Zhao, A. Sud, H. Sukegawa, S. Komori, K. Rogdakis, K. Yamanoi, J. Patchett, J. W. A. Robinson, C. Ciccarelli, and H. Kurebayashi,
   "Growth, strain, and spin-orbit torques in epitaxial Ni-Mn-Sb films sputtered on GaAs"
   Phys. Rev. Mater. 5, 014413-1~8 (2021).
   


9. Mahmoud Rasly, Tomoya Nakatani, Jiangnan Li, H. Sepehri-Amin, Hiroaki Sukegawa, and Yuya Sakuraba,
   "Magnetic, magnetoresistive and low-frequency noise properties of tunnel magnetoresistance sensor devices with amorphous CoFeBTa soft magnetic layers"
   J. Phys. D: Appl. Phys. 54, 095002-1~10 (2021).