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廣畑 貴文*; Lloyd, D. C.*; 窪田 崇秀*; 関 剛斎*; 高梨 弘毅; 介川 裕章*; Wen, Z.*; 三谷 誠司*; 小泉 洸生*
IEEE Access, 11, p.117443 - 117459, 2023/10
被引用回数：3 パーセンタイル：22.16(Computer Science, Information Systems)Spintronic devices are expected to replace the recent nanoelectronic memories and sensors due to their efficiency in energy consumption and functionality with scalability. To date, spintronic devices, namely magnetoresistive junctions, employ ferromagnetic materials by storing information bits as their magnetization directions. However, in order to achieve further miniaturization with maintaining and/or improving their efficiency and functionality, new materials development is required: 1) increase in spin polarization of a ferromagnet or 2) replacement of a ferromagnet by an antiferromagnet. Antiferromagnetic materials have been used to induce an exchange bias to the neighboring ferromagnet but they have recently been found to demonstrate a 100% spin-polarized electrical current, up to THz oscillation and topological effects. In this review, the recent development of three types of antiferromagnets is summarized with offering their future perspectives towards device applications.
社本 真一*; 赤津 光洋*; 松浦 直人*; 河村 聖子; 針井 一哉*; 小野 正雄*; Chang, L.-J.*; 伊藤 孝; 根本 祐一*; 家田 淳一
Physical Review Research (Internet), 4(1), p.013245_1 - 013245_7, 2022/03
イットリウム鉄ガーネットの磁気ブラッグピークに対する超音波注入効果を、準弾性中性子散乱によって研究した。磁気ブラッグピークは、温度の低下とともに大幅に強化さる。エネルギー幅は、超音波注入によって引き起こされる試料温度上昇の平方根に比例して増加した。磁気ブラッグピークは格子振動によって増強されることから、この増強はスピン-格子結合と密接に関連していると予想される。縦波モードで100Kを超えると観測された急激な散乱信号の低下は、スピン-格子結合の劣化を示唆している。これは、温度が100Kを超えるとスピンゼーベック効果が低下することと一致しており、スピン-格子結合による劣化メカニズムに証明を与えている。
家田 淳一
JPSJ News and Comments (Internet), 16, P. 12_1, 2019/01
A new approach has resolved a mystery in the nonequilibrium theory of quantum particles called "magnons", propelling a research on magnon based spintronics.
前川 禎通
no journal, ,
We introduce mechanical effects in spintronics and propose a variety of novel spintronics phenomena. The mechanical generation of spin and spin current opens a door from "Spintronics" to "Spin-Mechatronics."
前川 禎通
no journal, ,
The flow of electron spin, the so-called "spin curren", is a key concept in the recent progress in spintronics. When the spin current interacts with the magnetic moment in a ferromagnetic metal, the angular momentum and energy conservations give rise to the spin transfer torque and spinmotive force, respectively. When it is injected into a non-magnetic metal attached to a ferromagnet, the electric current is induced through the spin-charge conversion mechanism (inverse spin Hall effect). The generation and manipulation of the spin current and a variety of novel phenomena given by the spin current are discussed. Thermally driven spin current generation, i.e., the spin Seebeck effect, is examined in detail. This work has been done in collaboration with H. Adachi, Y. Ohnuma, K. Uchida, and E. Saitoh.
