廣畑貴文Professor Atsufumi Hirohata (PI)

研究内容Research Interests

本研究室は、廣畑貴文が2023年10月に東北大学先端スピントロニクス研究開発センターに着任して始まりました. それまでは16年強ほど英国ヨーク大学電子工学科にて研究室を主宰し、原子レベル制御に基づく磁性材料開発からスピントロニクス素子の作製・評価まで幅広く研究していました. それ以前には理研にてスピン流干渉などの研究を2年間強行い、東北大学にて完全に規則化したホイスラー合金薄膜作成に初めて成功しました. さらにマサチューセッツ工科大学において相変化メモリの開発も手がけました。PhDは2001年に円偏光によるスピン偏極電流励起と磁区構造観察でケンブリッジ大学において取得し、物理学の学士・修士号を慶應義塾大学にて修了しました.

現在JST Aspireプロジェクトなどの研究代表を務めており、これまでに180報近くの論文、 150件以上の国際会議などでの招待講演を行っています.

同時に学会活動なども積極的に行っていて、2023〜24年には IEEE Magnetics Societyの会長を務めたり、 Science and Technology of Advanced Materials の副編集長、Journal of Physics D: Applied Physics、 Spin、 Frontiers in Physics、 Magnetochemistry、 Scientific Reportsなどの編集委員を務めています.

現在はスピントロニクス論理メモリ回路の作製・評価と新奇磁性材料の開発を行っており、世界的に幅広く共同研究を進めています.詳細は研究内容ページを御参照ください.
Dr Atsufumi Hirohata is a Professor at the Center for Science and Innovation in Spintronics in Tohoku University since October 2023. Before coming to Sendai, he was a Senior Professor in Nanoelectronics since October 2016 after joining the Department of Electronics (now Department of Electronic Engineering) in September 2007. He has over 15 years of experience in spintronics, ranging from magnetic-domain imaging to spin-current interference. Before coming to York, he was a researcher at RIKEN, a Japanese governmental research institute, for over two years, where he designed a spin-current interference device, which can be used as a spin operation in a spintronic three-terminal transistor. He was before working as a postdoctoral researcher at Tohoku University, and successfully fabricated a perfectly ordered epitaxial full-Heusler alloy films, which was the first report to their knowledge and was acknowledged by several awards. He also worked as a postdoctoral associate at Massachusetts Institute of Technology, where he demonstrated basic function of a phase-change memory, which has been recently released in a market by Intel. He received his PhD in Physics at the University of Cambridge in 2001 and then served as a research associate at the Cavendish Laboratory to complete his study on spin detection of optically pumped spin-polarised electrons in a semiconductor with using a ferromagnetic overlayers, which attracted great interests, resulting a few invited talks and papers. He was originally graduated from Keio University for his BSc and MSc studies in Physics.

During this time he has secured seven major research grants with a total value of GBP 12M. He has maintained a high level of publication throughout his career having published 150 refereed works, and 6 book chapters (including 2 edited books). These include Nature Materials, Nature Electronics, Advanced Functional Materials, Nature Communications, Physical Review Letters, Scientific Reports and Applied Physics Letters. He has also filed 36 patents (including 7 pending). His H-index is currently 31 (36) and my work has been cited over 5,800 (9,100) times in total by Web of Science (Google Scholar). Full list of publications can be found at Publications page.

He has also given over 150 invited talks since 2007 including at prestigious meetings such as an Intermag conference in Ireland, MMM conference in USA, and UK-Korea workshop on New Trends in Magnetism in Korea, an UK-Japan workshop on Organic Electronics in London and the Seagate Conclave in Belfast and at other leading centres such as the Naval Research Laboratory and Argonne National Laboratory in the USA. Full list of presentations can be found at Presentations page.

He has actively involving the activities of the IEEE Magnetics Society by being the President (2023-24), President-Elect (2021-22), Secretary-Treasurer (2019-20), Chair of the Education Committee (2017-18) etc. He is also a Deputy Editor of Science and Technology of Advanced Materials an editorial board member of Journal of Physics D: Applied Physics, Spin, Frontiers in Physics, Magnetochemistry and Scientific Reports.

His present research interests include fabrication of a spin operator and growth of a half-metalic film. Further details can be found in research.

受賞歴Awards and Honours

Altmetrics Awards,
"Heusler alloys for spintronic devices: Review on recent development and future perspectives,"
Science and Technology of Advanced Materials, December 2021.
Global Peer Review Awards,
"Top 1% in Field Excellent Reviews,"
Publons, October 2019.
Poster Award at the NIMS Academic Symposium,
"Tunnel magnetoresitstance of equiatomic quaternary CoFeCrAl Heusler alloy films,"
Tsukuba, Japan, October 2018.
Best Poster Award at the Magnetism 2015 Conference,
"Crystallographic optmisation of Co₂FeSi with perpendicular anisotropy,"
Leeds, March 2015.
Best Poster Award at the Magnetism 2015 Conference,
"Characterisation of polycrystalline Heusler alloys,"
Leeds, March 2015.
Highlights of 2014 in Journal of Physics D: Applied Physics,
"Growth of polycrystalline Heusler alloys for spintronic devices,"
Bristol, December 2014.
Highlights of 2014 in Journal of Physics D: Applied Physics,
"Future perspectives for spintronic devices (invited review),"
Bristol, December 2014.
Wohlfarth Lecture,
"Nano-spintronics,"
Manchester, April 2014.
Royal Society Industry Fellowship,
"On-chip racetrack memory,"
London, October 2013 - September 2017.
Best Presentation Award at the 12th Joint MMM-Intermag Conference,
"Transport and structural properties of the abrupt Fe/GaAs(001) interface,"
Chicago, IL, USA, January 2013.
WUN-Spin 07 Best Poster Award,
"Structural and Magnetic Properties of Epitaxial Co-Based Full-Heusler Alloy Films,"
York, August 2007.
RIKEN President Award,
"Spin-current interference in a non-magnetic nano-ring,"
Wako, Japan, January 2007.
Magnetics Society of Japan Outstanding Presentation Award,
"Spin-current interference in a non-magnetic nano-ring,"
Matsue, Japan, November 2006.
Magnetics Society of Japan Young Scientist Award,
"Structural and magnetic properties of L2₁-structured Co₂(Cr,Fe)Al thin films,"
Nagano, Japan, September 2005.
Finalists of the Best Student Presentation Award in the MMM-Intermag Conference,
"Observation of ballistic spin-polarized electron transport in spin-valve structures,"
San Antonio, TX, USA, January 2001.
Materials Research Society Graduate Student Silver Award,
"Spin dependent electron transport through the ferromagnet/semiconductor interface,"
San Francisco, CA, USA, April 1999.

研究関連Activities

Editor of Journal of Magnetism and Magnetic Materials,
Elsevier, August 2015 - present.
Editorial Board Member of Frontiers in Condensed Matter Physics,
Frontiers, August 2013 - present.
Editorial Board Members of Journal of Physics D: Applied Physics,
Institute of Physics Publishing, November 2011 - present.
Editorial Board Members of SPIN,
World Scientific Publishing, August 2010 - present.
Editorial Advisory Board Members of Open Condensed Matter Physics Journals,
Bentham Science Publishers, June 2007 - November 2011.