Recovery of half-metallicity of oxide surfaces and its application to spin injection

氧化物表面半金属性的恢复及其在自旋注入中的应用

• 批准号: 23656034
• 负责人: KURAHASHI Mitsunori
• 金额: $ 2.5万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656034/
• 关键词: 表面・界面物性; 磁性; 酸化物

Half-metallic ferromagnets are important materials in the field of spintronics, but the spin polarization at their surfaces or interfaces is usually much lower than 100%, causing the transport properties of the devices much lower than expected from the bulk spin polarization. We have previously reported that the surface spin polarization of Fe3O4(100) can be drastically improved by hydrogen termination. In this study, we analyzed this phenomena for an Fe3O4(111) surface and tried to utilize it for inducing high spin polarization to adsorbed molecules. We clarified that the spin polarization at the (111) surface is positive unexpectedly and is not improved by H termination. This would originate from the fact that the tetrahedrally-cordinated Fe terminates the (111) surface.

半金属铁磁体是自旋电子学领域中的重要材料，但其表面或界面的自旋极化率通常远低于100%，导致器件的输运性质远低于体自旋极化的预期。我们以前曾报道过Fe_3 O_4（100）的表面自旋极化可以通过氢终止而得到显著改善。在这项研究中，我们分析了这种现象的Fe 3 O 4（111）表面，并试图利用它诱导高自旋极化吸附分子。我们澄清了在（111）表面的自旋极化是积极的，出乎意料的，并没有改善H终止。这可能源于四面体坐标的Fe终止于（111）表面的事实。

项目成果

Adsorbate-induced spin-polarization enhancement of Fe3O4(0 0 1)

• DOI: 10.1088/0022-3727/44/6/064010
• 发表时间: 2011-02
• 期刊: Journal of Physics D: Applied Physics
• 作者: A. Pratt;M. Kurahashi;X. Sun;Y. Yamauchi

Spin polarization of single-layer graphene epitaxially grown on Ni(1 1 1) thin film

• DOI: 10.1016/j.carbon.2013.04.077
• 发表时间: 2013-09
• 期刊: Carbon
• 影响因子: 10.9
• 作者: S. Entani;M. Kurahashi;Xia Sun;Y. Yamauchi

Energy-level alignment at the Alq3/Fe3O4(001) interface

• DOI: 10.1063/1.3677768
• 发表时间: 2012-03
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: A. Pratt;L. Dunne;X. Sun;M. Kurahashi;Y. Yamauchi

磁性体に接する単層グラフェンのスピン偏極

单层石墨烯与磁性材料接触的自旋极化

• 发表时间: 2013
• 作者: 孫霞;圓谷志郎;倉橋光紀;山内泰
• 通讯作者: 山内泰

Intrinsic spin polarity at the magnetite Fe_3O_4 surface

磁铁矿Fe_3O_4表面的本征自旋极性

• 发表时间: 2012
• 作者: A. Pratt;M. Kurahashi;X. Sun;Y . Yamauchi
• 通讯作者: Y . Yamauchi