カイラル磁性体における磁気スキルミオン格子構造の安定化

手性磁体中磁性斯格明子晶格结构的稳定性

• 批准号: 17F17706
• 负责人: 佐藤 卓
• 金额: $ 0.77万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2017
• 资助国家: 日本
• 起止时间: 2017-04-26 至 2019-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17706/
• 关键词: Skyrmion; Antiferromagnetism; Frustrated magnetism; Chiral magnet; Neutron scattering

The investigation of the stabilization of skyrmion-lattice was focused on two chiral materials: Cu2OSeO3 (ferromagnetic skyrmion), and CaBaCo2FeO7 (candidate for antiferromagnetic skyrmion). The dependence on the history and rate of temperature and field application when stabilizing the skyrmion-lattice in Cu2OSeO3 was evidenced. Furthermore, indications for higher order peaks were discovered. A new method was developed and applied successfully to discern these from double scattering. A manuscript has been prepared and can be expected later this year. The pursuit of more detailed effects lead to an improvement of the data reduction at the instrument TAIKAN, J-Parc. Applying the analysis techniques for Cu2OSeO3 helped discerning the impact of electric current on the skyrmion lattice in MnSi.The study of the general magnetic properties of CaBaCo2Fe2O7 was completed. Two types of order were separated using neutron scattering, a short range and a long range one. The first one is describable by a Heisenberg nearest neighbor model. Yet, the latter one shows additional precursors of a long-periodic spin structure, which were indeed found favorable using symmetry analysis. Another neutron experiment revealed the long range order to be a superposition of two periodic structures coexisting in a wide range of the AFM phase. While the longer periodic structure vanishes at lower temperatures, the remaining modulation resembles a skyrmion-lattice like spin structure. A manuscript on these features is in preparation. A key experiment was scheduled however postponed.

Skyrmion-lattice稳定的研究集中在两种手性材料上：Cu2oseo3（铁磁Skyrmion）和Cabaco2Feo7（抗铁磁性Skyrmion的候选）。稳定Cu2oseo3中的Skyrmion-lattice时，对温度和现场施用的历史和现场施用率的依赖性得到了证明。此外，还发现了高阶峰的适应症。开发了一种新方法，并成功地应用了这些方法，以辨别出这些方法与双散射。已经准备了手稿，可以预计今年晚些时候。追求更详细的效果会改善仪器Taikan（J-Parc）的数据减少。应用CU2OSEO3的分析技术有助于辨别电流对MNSI中Skyrmion晶格的影响。对CABACO2FE2O7的一般磁性特性的研究完成了。使用中子散射，短距离和远距离的两种类型的顺序分开。第一个由海森堡最近的邻居模型来描述。然而，后一个显示了长周期性旋转结构的其他前体，实际上，使用对称分析发现了这些前体。另一个中子实验表明，远距离顺序是在AFM相范围内共存的两个周期性结构的叠加。而较长的周期结构在较低的温度下消失，但其余的调制类似于旋转结构（如自旋结构）的天空晶体。这些功能的手稿正在准备。安排了一个关键实验，但是推迟了。

项目成果

Controlling the stoichiometry of the triangular lattice antiferromagnet Li1+xZn2-yMo3O8

控制三角晶格反铁磁体 Li1 xZn2-yMo3O8 的化学计量

• DOI: 10.1016/j.jssc.2018.12.064
• 发表时间: 2019
• 期刊: Journal of Solid State Chemistry
• 影响因子: 3.3
• 作者: Sandvik Kim E.;Okuyama Daisuke;Nawa Kazuhiro;Avdeev Maxim;Sato Taku J.
• 通讯作者: Sato Taku J.

Neutron diffraction study and theoretical analysis of the antiferromagnetic order and diffuse scattering in the layered Kagome system CaBaCo2Fe2O7

层状 Kagome 体系 CaBaCo2Fe2O7 中的中子衍射研究及反铁磁序和漫散射的理论分析

• 发表时间: 2018
• 作者: J. D. Reim;E. Ros en;O. Zaharko;M. Mostovoy;M. Valldor;T. J. Sato;W. Schweika
• 通讯作者: W. Schweika

Julich Center for Neutron Science/Peter Grunberg Institute/JARA-FIT(ドイツ)

尤利希中子科学中心/Peter Grunberg Institute/JARA-FIT（德国）

Paul Scherrer Institute(スイス)

保罗谢勒研究所（瑞士）

Spin wave excitations under strong frustration in the layered kagome compound CaBaCo2Fe2O7

层状戈薇化合物CaBaCo2Fe2O7中强挫败下的自旋波激发

• 发表时间: 2018
• 作者: Johannes D. Reim;Julien Robert;Martin Valldor;Werner Schweika
• 通讯作者: Werner Schweika