電子スピン物性工学研究室

NEWS

2025-10-25 Group outing on the stunning and serene Nokonoshima Island!

2025-10-22 Naoto presented a poster at Open Innovation Workshop.

2025-10-10 New results, the current-induced switching of thulium iron garnet was published in npj Spintronics! >>article >>press

2025-10-08 We were delighted to welcome Prof. Clive Roberts from Durham University. We had a fruitful discussion on potential collaborations in both research and education.

2025-10-01 【New member!】Ms. Xu Jinyu, Welcome to SPIN LAB!

Introduction

SPIN LAB is newly launched research group at Kyushu University, established in January 2025 and led by Associate Professor Naoto Yamashita. Rooted in fundamental physics and driven by the goal of creating innovative devices, our research focuses on the field of spintronics from three key perspectives: crystal growth, interfacial physics, and device physics. The core of SPIN LAB's research lies in spin currents—the flow of spin angular momentum. We are particularly passionate about understanding and advancing their generation, transport, and control, as these processes: the foundation of innovative spintronic technologies.

Currently, we are working in the following three specific areas in spintronics:

Ferrimagnetic Garnet

In the largest scale,
we have developed
uniform deposition technology
for electrically switchable
ferrimagnetic garnet.

M. N. Agusutrisno, N. Yamashita et al.,
Thin Solid Films 788, 140176 (2024).

Spin Currents in Semiconductor

For the first time,
we succeeded in formation of an ohmic contact by a ferrimagnetic metal on non-degenerate n-type silicon.

N. Yamashita, Y. Ando, et al.,
Physical Review Materials 6, 104405 (2022).

Spin-Caloritronics

For the first time,
we have generated
spin current in semiconductors
via the spin-dependent Seebeck effect.

N. Yamashita, Y. Ando, M. Shiraishi et al., Physical Review Applied 9, 054002 (2018).

>> More about the research fields

Member

Associate Professor

Naoto Yamashita Ph.D.

Doctoral Students

Xu Jinyu

Master Students

Lei Yan

Undergraduate Students

Tomosuke Imamura

Main Research Papers

⭐Roselle Ngaloy$, Naoto Yamashita*$, Bing Zhao, Soojung Kim, Kohei Yamashita, Ivo P. C. Cools, Marlis N. Agusutrisno, Soobeom Lee, Yuichiro Kurokawa, Chun-Yeol You, Hiromi Yuasa, Saroj P. Dash$, "Deterministic spin-orbit torque switching of epitaxial ferrimagnetic insulator with perpendicular magnetic anisotropy fabricated by on-axis magnetron sputtering", npj Spintronics 3, 40 (2025).
Marlis N Agusutrisno*, Sora Obinata, Takamasa Okumura, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Naoto Yamashita, ”Large-scale fabrication of thulium iron garnet film with perpendicular magnetic anisotropy using RF magnetron sputtering”, Japanese Journal of Applied Physics 63, 07SP06 (2024).
⭐Marlis N Agusutrisno*, Takamasa Okumura, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Naoto Yamashita, ”Effect of nanoscale inhomogeneity on blocking temperature of ZnO:Co films fabricated by using nitrogen-mediated crystallization”, MRS Advances (2024).
⭐Marlis Nurut Agusutrisno, Christopher H. Marrows, Kunihiro Kamataki, Takamasa Okumura, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Naoto Yamashita*, ”On-axis sputtering fabrication of $\rm Tm_3 Fe_5 O_{12}$ film with perpendicular magnetic anisotropy”, Thin Solid Films 788, 140176 (2024). Open access.
M. N. Agusutrisno*, Ryota Narishige, Kunihiro Kamataki, Takamasa Okumura, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Naoto Yamashita, ”Control of inhomogeneity and magnetic properties of ZnO:Co films grown by magnetron sputtering using nitrogen”, Materials Science in Semiconductor Processing 162, 107503 (2023).
⭐N. Yamashita*, R. Mitsuishi, Y. Nakamura, K. Takeda, M. Hori, K. Kamataki, T. Okumura, K. Koga, and M. Shiratani, ”Role of insoluble atoms in the formation of a three-dimensional buffer layer in inverted Stranski-Krastanov mode”, Journal of Materials Research (2023), Invited paper.
Ryota Narishige*, Naoto Yamashita, Kunihiro Kamataki, Takamasa Okumura, Kazunori Koga, Masaharu Shiratani, Hisato Yabuta, Naho Itagaki, ”Effects of substrate surface polarity on heteroepitaxial growth of pseudobinary ZnO–InN alloy films on ZnO substrates”, Journal of Materials Research (2022), Invited paper.
⭐N. Yamashita, E. Shigematsu, S. Honda, R. Ohshima, M. Shiraishi, and Y. Ando*, "Realization of efficient tuning of the Fermi level in iron-based ferrimagnetic alloys", Physical Review Materials 6, 104405 (2022). Highlight in Physics
Yuta Nakamura$, Naoto Yamashita*$, Kunihiro Kamataki, Takamasa Okumura, Kazunori Koga, Masaharu Shiratani and Naho Itagaki* ($: these authors contributed equally to this study), “Growth of single crystalline ZnO films on 18%-lattice-mismatched sapphire substrates using buffer layers with three-dimensional islands”, Crystal Growth & Design 22, 6, 3770-3777 (2022).
D. Takahashi*, N. Yamashita, D. Yamashita, K. Okumura, K. Kamataki, K. Koga, M. Shiratani and N. Itagaki, “Epitaxial growth of $\rm{Zn_{1−\it{x}}Mg_{\it{x}}O}$ films on sapphire substrates via inverted Stranski-Krastanov mode using magnetron sputtering”, MRS Advances (2022).
S. Lee, H. Koike, M. Goto, S. Miwa, Y. Suzuki, N. Yamashita, R. Ohshima, E. Shigematsu, Y. Ando and M. Shiraishi*, "Synthetic Rashba spin-orbit system using a silicon metal-oxide semiconductor", Nature Materials 20, 1228 (2021).
N. Yamashita*, S. Lee, R. Ohshima, E. Shigematsu, H. Koike, Y. Suzuki, S. Miwa, M. Goto, Y. Ando and M. Shiraishi, "Investigation of the thermal tolerance of silicon-based lateral spin valves", Scientific Reports 11, 10583 (2021).
N. Yamashita*, S. Lee, R. Ohshima, E. Shigematsu, H. Koike, Y. Suzuki, S. Miwa, M. Goto, Y. Ando and M. Shiraishi, "Enhancement of spin signals by thermal annealing in silicon-based lateral spin valves", AIP Advances 10, 095021 (2020). Editor’s Pick.
⭐Naoto Yamashita, Yuichiro Ando, Hayato Koike,Shinji Miwa, Yoshishige Suzuki, and Masashi Shiraishi*, "Thermally Generated Spin Signals in a Nondegenerate Silicon Spin Valve", Physical Review Applied 9, 054002 (2018).
S. Lee, N. Yamashita, Y. Ando*, S. Miwa, Y. Suzuki, H. Koike and M. Shiraishi*, "Investigation of spin scattering mechanism in silicon channel of Fe/MgO/Si lateral spin valves", Applied Physics Letters 110, 192401 (2017).