二次元ファンデルワールス反強磁性体におけるスピンダイナミクスの電気的検出

二维范德华反铁磁体中自旋动力学的电检测

• 批准号: 22KJ2060
• 负责人: 渡邉 杜
• 金额: $ 1.98万
• 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: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22KJ2060/
• 关键词: Antiferromagnet; Frustrated Magnetism; vdW Magnetic Materials; van-der-Waals; antiferromagnet; electrical transport

During the 2022 fiscal year, the applicant has continued the research on the anomalous Hall and magnetoresistance effect of Ag2CrO2. Varying the thickness of Ag2CrO2 has led to a strong dependence of the anomalous Hall effect and linear magnetoresistance of the material, indicating a large change in the magnetic properties of the material with respect to thickness and the quality of the samples. Currently, further experiments are being performed to investigate the origin of such a behavior, such as extrinsic scattering effects due to fluctuations of spins or the spin structure of the frustrated spin system. Spin transport devices of Ag2CrO2 has also been fabricated in order to investigate the effect of frustrated spins on the spin current. Although some successful devices were measured, further trial is required to accurately evaluate the spin Hall effect in Ag2CrO2. Furthermore, the applicant has started to perform electrical and spin transport measurements on PdNi, a related frustrated material, in order to compare its electrical and spin transport behavior to Ag2CrO2. Further experiment is being performed to understand the relation between the spin current and frustrated spin systems.

在2022财年，申请人继续对Ag2CrO2的异常霍尔效应和磁阻效应进行研究。改变Ag2CrO2的厚度导致材料的异常霍尔效应和线性磁阻的强烈依赖性，表明材料的磁性能与厚度和样品质量有关。目前，正在进行进一步的实验来研究这种行为的起源，例如自旋波动引起的外部散射效应或受挫自旋系统的自旋结构。为了研究受挫自旋对自旋电流的影响，我们还制作了Ag2CrO2的自旋输运装置。虽然已经测量到一些成功的器件，但要准确地评估Ag2CrO2中的自旋霍尔效应，还需要进一步的试验。此外，申请人已经开始对PdNi（一种相关的受挫材料）进行电和自旋输运测量，以便将其电和自旋输运行为与Ag2CrO2进行比较。进一步的实验正在进行，以了解自旋电流和受挫自旋系统之间的关系。

项目成果

Unique magnetoresistance and Hall effects in classical triangular antiferromagnet Ag2CrO2 thin films

经典三角反铁磁体 Ag2CrO2 薄膜中独特的磁阻和霍尔效应

• 发表时间: 2022
• 作者: M. Watanabe;R. Asama;M. Tokuda;S. Suzuki;H. K. Yoshida;Y. Niimi
• 通讯作者: Y. Niimi

量子スピン三角格子反強磁性体Ag2CoO2薄膜における磁気伝導特性

量子自旋三角晶格反铁磁Ag2CoO2薄膜的磁导特性

• 发表时间: 2022
• 作者: 浅間遼太郎;渡邉杜;佐々木壱晟;中村瞭弥;吉田紘行;新見康洋
• 通讯作者: 新見康洋

Bi/Ni 薄膜における Little-Parks 振動の観測

Bi/Ni 薄膜中 Little-Parks 振荡的观察

• 发表时间: 2021
• 作者: 徳田将志，中尾舞，渡邉杜，中村瞭弥，前田将輝，Sanghyun Lee，Yue Di;青山和司，水島健，Jin Xiao-Feng，小林研介，新見康洋
• 通讯作者: 青山和司，水島健，Jin Xiao-Feng，小林研介，新見康洋

Thickness-induced crossover from strong to weak collective pinning in exfoliated FeTe0.6Se0.4 thin films at 1 T

• DOI: 10.1103/physrevb.104.165412
• 发表时间: 2021-10
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: R. Nakamura;Masashi Tokuda;Mori Watanabe;M. Nakajima;K. Kobayashi;Y. Niimi

Charge density wave transitions in mechanically-exfoliated NbSe3 devices

• DOI: 10.35848/1347-4065/ac0644
• 发表时间: 2021
• 期刊: Japanese Journal of Applied Physics
• 影响因子: 1.5
• 作者: K. Fujiwara;S. Iwakiri;Mori Watanabe;R. Nakamura;Masahiko Yokoi;K. Kobayashi;Y. Niimi