Kota Muroi

• Superconducting Thin Films
• Bulk Synthesis
• Radiation Resistance
• High-Entropy Materials

Responsible for thin-film deposition and irradiation-resistance evaluation of high-entropy-type (HE-type) REBCO superconducting thin films. Carries out the full workflow from thin-film fabrication by pulsed laser deposition (PLD) and bulk target synthesis by solid-state reaction, through structural analysis by XRD and magnetization measurement by SQUID magnetometer, to microstructural observation by TEM/HAADF-STEM, FIB, and SEM-EDS — working to improve irradiation resistance toward applications in superconducting magnets for fusion reactors. Irradiation experiments were carried out using the ion implanters at Hokkaido University's Advanced Electron Microscope Facility, QST Takasaki TIARA, and the Tokyo Metropolitan Industrial Technology Research Institute. Also worked on a demonstration test of a solar-panel-mounted thermoelectric module, as a joint research project with the Tokyo Waterworks Bureau (2024–2025).

• March 2024

  Graduated from the Department of Physics, Faculty of Science, Tokyo Metropolitan University

• March 2026

  Completed the Master's Program in Physics, Graduate School of Science, Tokyo Metropolitan University

• May 2026

  Appointed Specially Appointed Engineer at the National Institute for Materials Science (NIMS)

• Sample & Thin-Film Fabrication

  Bulk and target fabrication by PLD and solid-state reaction methods

• Structural Analysis

  XRD (lattice constant evaluation, orientation, tracking structural changes before/after irradiation)

• Physical Property Measurement

  Magnetization measurement using a SQUID magnetometer (MPMS3)

• Microstructural Observation

  TEM / HAADF-STEM, FIB, SEM-EDS

• Simulation

  TRIM calculations

• Programming

  Data analysis with Python (pandas, numpy, matplotlib, scipy); building and maintaining the lab website; developing custom analysis software; server administration for tools such as chat platforms

• 7.

  K. Muroi, A. Yamashita, M. Yamanaka, Y. Mizuguchi, T. Kaneko, H. Yamada, N. Oono, K. Yoshida, "Development of high-entropy-type REBCO superconductor with multiple sites substitution", 22nd International Conference on Fusion Reactor Materials, Shizuoka (Japan), September 2025.Poster

• 6.

  K. Muroi, A. Yamashita, S. Yamanaka, T. Kaneko, N. Ono, Y. Mizuguchi, "Irradiation Resistance of Multi-Site-Substituted High-Entropy-Type REBa2Cu3O7-δ Superconductors," The Ceramic Society of Japan, 38th Autumn Symposium, Gunma, September 2025.Oral

• 5.

  K. Muroi, A. Yamashita, T. Kaneko, Y. Mizuguchi, N. Oono, T. Shibayama, "Irradiation resistance of high-entropy REBa2Cu3O7-d superconductors with multiple sites substitution", 10th Japan-Korea International Symposium on Materials Science and Technology, Tokyo (Japan), July 2025.Poster

• 4.

  K. Muroi, A. Yamashita, S. Yamanaka, T. Kaneko, N. Ono, Y. Mizuguchi, "Development of Multi-Site-Substituted High-Entropy-Type REBCO Superconductors," 72nd JSAP Spring Meeting 2025, Chiba, March 2025.Poster

• 3.

  K. Muroi, A. Yamashita, M. Yamanaka, T. Kaneko, N. Oono, Y. Mizuguchi, "Development of High-Entropy-Type REBCO Superconductor with Multiple Sites Substitution", Iron-based Superconductors: Advances towards applications 2025, Miyazaki (Japan), February 2025.Poster

• 2.

  K. Muroi, A. Yamashita, S. Yamanaka, Y. Mizuguchi, "Development of High-Entropy-Type REBa2Cu3O7-δ Superconductors with Multi-Element Substitution at Multiple Sites," Cryogenics and Superconductivity Society of Japan, Kyushu/West Japan Branch 2024 Young Researchers Event, Kochi, October 2024.Oral

• 1.

  K. Muroi, A. Yamashita, S. Yamanaka, Y. Mizuguchi, "Development of High-Entropy-Type REBa2Cu3O7-δ Superconductors with Multi-Element Substitution at Multiple Sites," 79th Annual Meeting of the Physical Society of Japan, Hokkaido, September 2024.Poster

• 2025

  Session Best Presentation Award

  The Ceramic Society of Japan, 38th Autumn Symposium

• 8.

  "Rare-Earth Element Selection by Neutron Scattering Cross Section in HE-REBCO," A. Yamashita, K. Muroi, L. Kubota — Filed: 2026/3/25, US Application 64/016,201 (International)

• 7.

  "Superconductor, Superconducting Wire, Superconducting Coil, and Method for Manufacturing a Superconductor," A. Yamashita, S. Yamanaka, K. Muroi, N. Hori (Ono), T. Kaneko — Filed: 2026/3/3, PCT/JP2026/008062 (International)

• 6.

  "Superconducting Wire, Method for Manufacturing a Superconducting Wire, and Method for Repairing a Cuprate-Based Superconductor," A. Yamashita, K. Muroi — Filed: 2025/12/5, Japan Patent Application No. 2025-236021

• 5.

  "Superconductor and Method for Manufacturing a Phase-Separated Superconductor," A. Yamashita, K. Muroi, R. Kobayashi — Filed: 2025/8/29, Japan Patent Application No. 2025-144279

• 4.

  "Cuprate-Based Superconductor, Cuprate-Based Superconductor Unit, and Method for Repairing a Cuprate-Based Superconductor," A. Yamashita, S. Yamanaka, K. Muroi — Filed: 2025/6/9, PCT/JP2025/020800 (International)

• 3.

  "Laminate and Method for Manufacturing a Laminate," A. Yamashita, S. Yamanaka, K. Muroi — Filed: 2025/6/9, PCT/JP2025/020778 (International)

• 2.

  "Superconductor and Method for Manufacturing a Superconductor," A. Yamashita, S. Yamanaka, K. Muroi, N. Hori (Ono), T. Kaneko — Filed: 2025/3/3, Japan Patent Application No. 2025-032960

• 1.

  "Laminate and Method for Manufacturing a Laminate," A. Yamashita, S. Yamanaka, K. Muroi — Filed: 2024/6/7, Japan Patent Application No. 2024-093048