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首页> 外文期刊>Physical review >First-principles study of spin properties and laser-induced ultrafast spin dynamics in transition-metal oxide clusters TM_3O_3~(0/+) (TM = Fe, Co, and Ni)
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First-principles study of spin properties and laser-induced ultrafast spin dynamics in transition-metal oxide clusters TM_3O_3~(0/+) (TM = Fe, Co, and Ni)

机译：过渡金属氧化物簇TM_3O_3〜（0 / +）（TM = Fe，Co和Ni）的自旋特性和激光诱导的超快自旋动力学的第一性原理研究

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摘要

We present a first-principles study of spin properties of the triplet TM_3O_3~(0/+) (TM = Fe, Co, Ni) clusters and their laser-induced ultrafast spin dynamics. The differences in geometries, infrared spectra, and level distributions of the three structures are discussed. It is found that the spin localization of the clusters is both structurally and magnetic-field dependent. Specifically, within the same magnetic field, the number of the spin-localized states decreases when the magnetic center changes from Fe via Co to Ni. Even for the same cluster, the spin-localized states may differ under different field directions, due to the fact that spin magnitudes and spin directions of the states change with magnetic field. For the spin dynamics, the results indicate that the system which possesses more spin-localized states normally exhibits rich spin functionalities. Among the various achieved laser-induced ultrafast spin-transfer scenarios, a spin-transfer cycle in Fe_3O_3, a partial demagnetization process in CO_3O_3~+, and a spin bifurcation scenario in Ni_3O_3 are presented and analyzed, respectively. These results provide added information for the varieties of ultrafast optical control of magnetism in transition-metal oxide systems, and pave the way toward future related device design and molecular spintronics applications.
机译：我们提出了三重态TM_3O_3〜（0 / +）（TM = Fe，Co，Ni）团簇的自旋性质及其激光诱导的超快自旋动力学的第一性原理研究。讨论了这三种结构的几何形状，红外光谱和能级分布的差异。发现簇的自旋局域性在结构和磁场上均是依赖的。具体地，在相同的磁场内，当磁心从Fe经由Co变为Ni时，自旋局域态的数量减少。即使对于相同的簇，由于状态的自旋幅度和自旋方向随磁场而变化的事实，自旋局部化的状态在不同的磁场方向下也可能不同。对于自旋动力学，结果表明具有更多自旋局部化状态的系统通常表现出丰富的自旋功能。在已实现的各种激光诱导的超快自旋转移场景中，分别介绍和分析了Fe_3O_3中的自旋转移周期，CO_3O_3〜+中的部分退磁过程以及Ni_3O_3中的自旋分叉场景。这些结果为过渡金属氧化物系统中的磁性超快光学控制提供了更多信息，并为未来的相关器件设计和分子自旋电子学应用铺平了道路。

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  • 来源
    《Physical review》 |2020年第10期|104414.1-104414.11|共11页
  • 作者

    Pengpeng Wang; Mingyang Qiu; Xin Lu; Wei Jin; Chun Li; Georgios Lefkidis; Wolfgang Hübner;

  • 作者单位

    School of Physics and Information Technology Shaanxi Normal University Xi'an 710119 China;

    School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an 710072 China;

    School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an 710072 China Department of Physics and Research Center OPTIMAS Technische Universität Kaiserslautern PO Box 3049 67653 Kaiserslautern Germany;

    Department of Physics and Research Center OPTIMAS Technische Universität Kaiserslautern PO Box 3049 67653 Kaiserslautern Germany;

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