Photomagnetic Inorganic Nanosheets towards Spintronics Application

• Project/Area Number: 18K04710
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Keio University
• Principal Investigator: Yamamoto Takashi 慶應義塾大学, 理工学部(矢上), 講師 (40532908)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 磁性 / ナノシート / 磁性体 / 磁気物性 / 光化学反応 / 無機ナノシート / 光物性 / スピントロニクス

Outline of Final Research Achievements

In this research project, I have aimed at the development of next-generation spintronics devices and created magnetic layered compounds and their nanosheets.
Regarding layered double hydroxides (LDH) containing magnetic ions, I have found out the following phenomena: (i) the negative magnetic exchange coupling interaction by integrating the different LDHs, and (ii) the photomodulation of magnetic properties by integrating with semiconductor nanosheets.
Regarding transition metal tricalcogenides containing magnetic ions, I have found out the following strategies are effective: (i) long-term calcination with a gentle temperature gradient during synthesis, and (ii) ultrasonication in a polar solvent containing a base during exfoliation.

Academic Significance and Societal Importance of the Research Achievements

本研究課題においては、「無機ナノシートが真に次世代エレクトロニクスを支える基幹物質となりうるか」を命題に掲げ、未解明な部分が多い無機ナノシートの磁気物性の開拓に焦点を当てた。
異なる物性を有する磁性層状複水酸化物ナノシートを巧妙に組み合わせることによって、単体では発現しない磁気物性を発現させることに成功したことは学術的にも社会 (産業) 的にも意義深いと言える。
また、スピントロニクス分野への応用に資する磁性リントリカルコゲナイドナノシートの合成に対する重要な知見を得たことは、今後の学際領域研究の発展に対して寄与するところが少なくないと言える。

Research Products

• [Int'l Joint Research] University of Konstanz(ドイツ)
• [Journal Article] Enhancement of coercivity of self-assembled stacking of ferrimagnetic and antiferromagnetic nanocubes (2020)
  • Author(s): K. Sawano, K. Tsukiyama, M. Shimizu, M. Takasaki, Y. Oaki, T. Yamamoto, Y. Einaga, C. Jenewein, H. Colfen, H. Kaiju, T. Sato and H. Imai
  • Journal Title: Nanoscale Volume: 12 Issue: 14 Pages: 7792-7796
  • DOI: 10.1039/c9nr10558a
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Surface Rashba-Edelstein Spin-Orbit Torque Revealed by Molecular Self-Assembly (2020)
  • Author(s): Satoshi Haku、Atsushi Ishikawa、Akira Musha、Hiroyasu Nakayama、Takashi Yamamoto、Kazuya Ando
  • Journal Title: Physical Review Applied Volume: 13 Issue: 4 Pages: 044069-044069
  • DOI: 10.1103/physrevapplied.13.044069
  • Peer Reviewed
• [Journal Article] Weak Antilocalization and Spin Hall Effect in Pt Films Doped with Molecular Spin (2020)
  • Author(s): Iwamoto Wataru、Yamamoto Takashi、Tsuchii Kaname、Tazaki Yuya、Asami Akio、Hayashi Hiroki、Einaga Yasuaki、Ando Kazuya
  • Journal Title: ACS Applied Electronic Materials Volume: 2 Issue: 7 Pages: 2098-2103
  • DOI: 10.1021/acsaelm.0c00330
  • Peer Reviewed
• [Journal Article] In Situ Spectroscopic Study on the Surface Hydroxylation of Diamond Electrodes (2019)
  • Author(s): Kasahara Seiji、Ogose Taiga、Ikemiya Norihito、Yamamoto Takashi、Natsui Keisuke、Yokota Yasuyuki、Wong Raymond A.、Iizuka Shota、Hoshi Nagahiro、Tateyama Yoshitaka、Kim Yousoo、Nakamura Masashi、Einaga Yasuaki
  • Journal Title: Analytical Chemistry Volume: 91 Issue: 8 Pages: 4980-4986
  • DOI: 10.1021/acs.analchem.8b03834
  • Peer Reviewed
• [Journal Article] Observation of Proton Transfer Coupled Spin Transition and Trapping of Photoinduced Metastable Proton Transfer State in an Fe(II) Complex (2019)
  • Author(s): Nakanishi Takumi、Hori Yuta、Sato Hiroyasu、Wu Shu-Qi、Okazawa Atsushi、Kojima Norimichi、Yamamoto Takashi、Einaga Yasuaki、Hayami Shinya、Horie Yusuke、Okajima Hajime、Sakamoto Akira、Shiota Yoshihito、Yoshizawa Kazunari、Sato Osamu
  • Journal Title: Journal of the American Chemical Society Volume: 141 Issue: 36 Pages: 14384-14393
  • DOI: 10.1021/jacs.9b07204
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-Temperature Cooperative Spin Crossover Transitions and Single-Crystal Reflection Spectra of [FeIII(qsal)2](CH3OSO3) and Related Compounds (2019)
  • Author(s): Takahashi Kazuyuki、Yamamoto Kaoru、Yamamoto Takashi、Einaga Yasuaki、Shiota Yoshihito、Yoshizawa Kazunari、Mori Hatsumi
  • Journal Title: Crystals Volume: 9 Issue: 2 Pages: 81-81
  • DOI: 10.3390/cryst9020081
  • NAID: 120006599239
  • Peer Reviewed / Open Access
• [Journal Article] Contribution of Coulomb Interactions to a Two-Step Crystal Structure Phase Transformation Coupled with a Significant Change in Spin Crossover Behavior for a Series of Charged FeII Complexes from 2,6-Bis(2-methylthiazol-4-yl)pyridine (2018)
  • Author(s): Takahashi Kazuyuki、Okai Mitsunobu、Mochida Tomoyuki、Sakurai Takahiro、Ohta Hitoshi、Yamamoto Takashi、Einaga Yasuaki、Shiota Yoshihito、Yoshizawa Kazunari、Konaka Hisashi、Sasaki Akito
  • Journal Title: Inorg. Chem. Volume: 57 Issue: 3 Pages: 1277-1287
  • DOI: 10.1021/acs.inorgchem.7b02721
  • NAID: 120006469075
  • Peer Reviewed
• [Journal Article] Molecular engineering of Rashba spin-charge converter (2018)
  • Author(s): Hiroyasu Nakayama, Takashi Yamamoto, Hongyu An, Kento Tsuda, Yasuaki Einaga, and Kazuya Ando
  • Journal Title: Science Advances Volume: 4 Issue: 3
  • DOI: 10.1126/sciadv.aar3899
  • Peer Reviewed / Open Access