電圧による交換相互作用と磁化の制御

通过电压控制交换相互作用和磁化强度

• 批准号: 16F16362
• 负责人: 鈴木 義茂
• 金额: $ 1.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2016
• 资助国家: 日本
• 起止时间: 2016-11-07 至 2019-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16F16362/
• 关键词: magnetism with E-field; spinwaves; magnetic skyrmions; skyrmion dynamics; voltage effects; spin wave; magnetic dynamics; skyrmions dynamics; micromagnetics; Spin-wave eigenmodes

Electric field control of magnetic properties in metallic ferromagnets is attracting much attention because of its potential to be a key technology to produce ultralow energy consumption spintronics devices. Especially voltage induced magnetic anisotropy changes in ferromagnetic metal system at room temperature, have been widely studied targeting an ultra-low power MRAM applications. It is widely studied voltage induced magnetic properties, but the voltage control of the exchange interaction in 3d ferromagnets is under discussion. Beside of this, such voltage control in Aex may provide us new functionality of magnetic materials such as voltage switching of ferromagnetism, creation and annihilation of skyrmions, control of magnon velocity, etc. So, JSPS fellow had investigated electric field induced magnetic properties changes on the magnetic tunnel junction with perpendicular magnetic free layer.Skyrmions are topologically protected spin textures which often originated from asymmetric exchange coupling as known Dzyaloshinskii-Moriya interaction. Recently, it has been attracted due to the possibility of the skyrmion based information devices and information storage units. The motion of the skyrmion on two-dimensional film can be described by a modified version of Newton’s equation. JSPS fellow had explored on the skyrmions dynamics under various force such as gradient external magnetic field, gradient magnetic parameters, applying current and thermal energy.

金属铁磁体的电场控制是制造超低能耗自旋电子学器件的关键技术，因此备受关注。特别是室温下铁磁金属体系的电压诱导磁各向异性变化，针对超低功耗MRAM的应用得到了广泛的研究。电压感应磁学性质已被广泛研究，但三维铁磁体中交换相互作用的电压控制仍在讨论中。此外，Aex中的这种电压控制可以为我们提供磁性材料的新功能，如铁磁性的电压开关、skyrμ子的产生和湮灭、磁振子速度的控制等。因此，JSPS研究员研究了具有垂直磁性自由层的磁性隧道结在电场诱导下的磁性变化。Skyrmions是受拓扑保护的自旋织构，通常起源于不对称交换耦合，即Dzyaloshinskii-Moriya相互作用。最近，由于基于skyrmion的信息设备和信息存储单元的可能性，它受到了吸引。粒子在二维薄膜上的运动可以用牛顿方程的一个修正版本来描述。JSPS研究员研究了在梯度外磁场、梯度磁参数、外加电流和热能等不同力作用下的skyrmions动力学。

项目成果

Voltage effect on the spin-wave eigenmodes in the 65-nm-diameter CoFeB nanomagnet

电压对 65 nm 直径 CoFeB 纳米磁体自旋波本征模的影响

• 发表时间: 2017
• 作者: Jaehun Cho;Nam-Hui Kim;Seung Ku Kang;Hee-Kyeong Hwang;Jinyoung Jung;Henk J M Swagten;June-Seo Kim;and Chun-Yeol You;CHO Jaehun;CHO Jaehun;Jaehun CHO
• 通讯作者: Jaehun CHO

The micromagnetic simulation studies about formation of skyrmion state by controlling interfacial Dzyaloshinskii-Moriya interaction

控制界面Dzyaloshinskii-Moriya相互作用形成斯格明子态的微磁模拟研究

• 发表时间: 2017
• 作者: Jaehun Cho;Eiiti Tamura;Kohei Nawaoka;Shinji Miwa;Chun-Yeol You;and Yoshishige Suzuki
• 通讯作者: and Yoshishige Suzuki

The spin wave eigen modes in the 120-nm radius FeB disk shaped nano-magnet

120 nm 半径 FeB 盘形纳米磁体中的自旋波本征模

• 发表时间: 2016
• 作者: Jaehun Cho;Shinji Miwa;Kay Yakushiji;Hitoshi Kubota;Akio Fukushima;Chun-Yeol You;Shinji Yuasa;and Yoshishige Suzuki;Jaehun CHO
• 通讯作者: Jaehun CHO

Voltage controlled exchange stiffness and magnetic anisotropy in CoFeB characterized by spin waves excitation in magnetic tunnel junction

CoFeB 中的压控交换刚度和磁各向异性，以磁隧道结中的自旋波激励为特征

• 发表时间: 2017
• 作者: Jaehun Cho;Shinji Miwa;Kay Yakushiji;Hitoshi Kubota;Akio Fukushima;Chun-Yeol You;Shinji Yuasa;and Yoshishige Suzuki
• 通讯作者: and Yoshishige Suzuki

Voltage effect on the spin-wave eigenmodes in disk-shaped CoFeB nanomagnet

电压对圆盘状 CoFeB 纳米磁体自旋波本征模的影响

• 发表时间: 2017
• 作者: Jaehun Cho;Shinji Miwa;Kay Yakushiji;Shingo Tamaru;Hitoshi Kubota;Akio Fukushima;Shinji Yuasa;Chun-Yeol You and Yoshishige Suzuki
• 通讯作者: Chun-Yeol You and Yoshishige Suzuki