Pure spin current polarizer enabled by antiferromagnetic insulator.

Hetian Chen, Dingsong Jiang, Yujun Zhang, Xiaofu Qiu, Yuhan Liang, Qinghua Zhang, Fangyuan Zhu, Takuo Ohkochi, Mingfeng Chen, Yue Wang, Jingchun Liu, Qing He, Jing Ma, Pu Yu, Yuanhua Lin, Tianxiang Nan, Di Yi

Nature communications 16(1) 6257-6257 2025年7月7日

Pure spin current enables the transport of spin information without charge flow, providing opportunities for next-generation information technologies. A pure spin current polarizer, capable of controlling both its transmittance and spin polarization, is critical for the development of spintronics; however, it has not yet been demonstrated. Here, we demonstrate a highly efficient pure spin current polarizer at room temperature using a single-domain antiferromagnetic insulator film, through structural engineering and spin-lattice coupling. Our device exhibits a large differential magnon current transmittance at room temperature. Remarkably, we find that the spin polarization of the transmitted magnon current aligns with the Néel vector of the polarizer. This enables a large modulation of damping-like torque and generation of out-of-plane-polarized magnon current, offering alternative routes for developing energy-efficient spintronic devices. We anticipate that this pure spin current polarizer will serve as a building block for spintronics based on pure spin current.
Uncovering the origin of magnetic moment enhancement in Fe–Co–Ir alloys via high-throughput XMCD

Takahiro Yamazaki, Takahiro Kawasaki, Alexandre Lira Foggiatto, Ryo Toyama, Kentaro Fuku, Varun Kumar Kushwaha, Yoshinori Kotani, Takuo Ohkochi, Kotaro Higashi, Naomi Kawamura, Yuya Sakuraba, Yuma Iwasaki, Masato Kotsugi

Physical Review Materials 9(3) 2025年3月12日
Electronic Origin of Enhanced Photocatalytic Activity at the Anatase/Rutile Boundary: A Case of Acetic Acid on the TiO<inf>2</inf> Surface

Keita Hiromori, Nobuo Nakajima, Takumi Hasegawa, Shin Ichi Wada, Osamu Takahashi, Takuo Ohkochi, Kazuhiko Mase, Kenichi Ozawa

Journal of Physical Chemistry C 128(51) 21767-21775 2024年12月26日
Low-temperature liquid-crystalline nitroxide radical

Yoshiaki Uchida, Takuya Akita, Takuo Ohkochi, Xiao Qian Ma, Daichi Kiyohara, Sho Nakagami, Taira Yamazaki, Norikazu Nishiyama

Journal of Materials Chemistry C 13(1) 54-60 2024年11月15日
Consideration of Experiment to Introduce MEMS Devices into Spectroscopic Systems for Bending and Three-point Tension Tests

A. Yamaguchi, T. Ohkochi, M. Oura, T. Yokomatsu, K. Kanda

Sensors and Materials 36(8) 3465-3465 2024年8月16日

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MISC

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SrRuO3 under tensile strain: Thickness-dependent electronic and magnetic properties

Yuki K. Wakabayashi, Masaki Kobayashi, Yuichi Seki, Kohei Yamagami, Takahito Takeda, Takuo Ohkochi, Yoshitaka Taniyasu, Yoshiharu Krockenberger, Hideki Yamamoto

2024年4月8日

The burgeoning fields of spintronics and topological electronics require materials possessing a unique combination of properties: ferromagnetism, metallicity, and chemical stability. SrRuO3 (SRO) stands out as a compelling candidate due to its exceptional combination of these attributes. However, understanding its behavior under tensile strain, especially its thickness-dependent changes, remains elusive. This study employs machine-learning-assisted molecular beam epitaxy to investigate SRO films with thicknesses from 1 to 10 nm. This work complements the existing focus on compressive-strained SRO, opening a new avenue for exploring its hitherto concealed potential. Using soft X-ray magnetic circular dichroism, we uncover an intriguing interplay between film thickness, electronic structure, and magnetic properties. Our key findings reveal an intensified localization of Ru 4d t2g-O 2p hybridized states at lower thicknesses, attributed to the weakened orbital hybridization. Furthermore, we find a progressive reduction of magnetic moments for both Ru and O ions as film thickness decreases. Notably, a non-ferromagnetic insulating state emerges at a critical thickness of 1 nm, marking a pivotal transition from the metallic ferromagnetic phase. These insights emphasize the importance of considering thickness-dependent properties when tailoring SRO for next-generation spintronic and topological electronic devices.
放射光光電子顕微鏡による顕微分光の紹介～実装デバイス応用への期待を込めて～

大河内拓雄

エレクトロニクス実装学会誌 26(5) 472-476 2023年8月1日
特集号「放射光で観る最先端材料と物性」企画趣旨

𠮷信淳, 大河内拓雄

表面と真空 65(5) 216-217 2022年5月10日
偏光制御型アンジュレータを用いた直線偏光2nπ回転NEXAFS法及びXMLD法の測定

工藤佳生, 堀尾眞史, 平田靖透, 新部正人, 鷲見寿秀, 和田哲弥, 木下豊彦, 大河内拓雄

日本放射光学会年会・放射光科学合同シンポジウム(Web) 35th 2022年
巨大ひずみ加工により作製したFe50Pd50-xNix合金の構造変化と顕微分光解析

堀田善治, 梶田貴裕, 李昇原, 有田誠, 大河内拓雄, 小嗣真人

SPring-8/SACLA利用研究成果集 8(3) 493-496 2021年1月15日

本研究では、Fe50Pd50-xNix(x=6, 12, 25, 38, 44)の混合粉末を6GPaの高圧下で高圧ねじり(HPT)加工を行い、巨大ひずみを導入して固溶体状態のバルク状に固化した。続く熱処理で L10 構造の規則化を図った。X線回折(XRD)で規則相生成を確認し、振動試料型磁気力計(VSM)で保持力や飽和磁化を測定した。また、光電子顕微鏡(PEEM)を用いて試料表面の組成分布、磁区構造を調べた。これよりFe50Pd50におけるPdのNiによる置換がどの程度可能かについて検討した。