Antiferromagnetic Skyrmions in ultra-thin oxide films
超薄氧化膜中的反铁磁斯格明子
基本信息
- 批准号:402843438
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Priority Programmes
- 财政年份:
- 资助国家:德国
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- 项目状态:未结题
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项目摘要
Antiferromagnetic skyrmions are promising candidates for future spintronic applications because they combine advantages of antiferromagnets, such as a vanishing magnetic strayfield and fast dynamics, with the unique properties of particle-like skyrmions. Many different materials exhibit antiferromagnetic interactions and thus may potentially host antiferromagnetic skyrmions. Several theoretical studies have highlighted that such antiferromagnetic skyrmions are expected to exhibit a motion exactly along the direction of lateral currents, in contrast to ordinary (ferromagnetic) skyrmions which are deflected. Whereas recently skyrmions in synthetic antiferromagnets, i.e. antiparallelly coupled ferromagnetic layers, and skyrmions within ferrimagnets have been reported, no experimental demonstration of an individual skyrmion in an antiferromagnetic material has yet been presented. Isolated antiferromagnetic skyrmions are always metastable objects. To stabilize such localized twisted spin textures in antiferromagnets, a favorable interplay between the relevant magnetic interactions is necessary. In contrast to ferromagnetic skyrmions their antiferromagnetic counterparts cannot be induced by external magnetic fields, thus a local manipulation between an antiferromagnetic state and the metastable antiferromagnetic skyrmion must be achieved.We have identified the material class of ultra-thin magnetic oxide films as promising for both the stabilization and the manipulation of antiferromagnetic skyrmions. Depending on the preparation conditions variable amounts of oxygen can be incorporated into the surface layers of a magnetic film, enabling a tuning of the magnetic properties in order to achieve a favorable interplay for the stabilization of antiferromagnetic skyrmions. Many ultra-thin magnetic oxide films are polar, and thus they intrinsically amplify the effect of local electric fields on the spin texture, facilitating the local manipulation of the magnetic state. We will use spin-polarized scanning tunneling microscopy at low temperatures to characterize the magnetic order of model-type ultra-thin oxide films. This experimental method is particularly suited to study atomic-scale magnetic states because it combines spin sensitivity with atomic resolution. Moreover, the probe tip will be used to locally create and annihilate particle-like antiferromagnetic skyrmions with vertical currents or electric fields.
反铁磁Skyrmions是未来自旋电子学应用的有希望的候选者,因为它们联合收割机了反铁磁体的优点,例如消失的磁杂散场和快速动力学,以及粒子状Skyrmions的独特性质。许多不同的材料表现出反铁磁相互作用,因此可能潜在地拥有反铁磁skyrmions。一些理论研究强调,这种反铁磁skyrmions预计将表现出一个运动正好沿着方向的横向电流,而不是普通的(铁磁)skyrmions偏转。虽然最近合成反铁磁体中的skyrmion,即反铁磁耦合铁磁层中的skyrmion,以及亚铁磁体中的skyrmion已经报道,但还没有反铁磁材料中单个skyrmion的实验证明。孤立的反铁磁Skyrmions总是亚稳态物体。为了稳定反铁磁体中的这种局部扭转自旋织构,相关磁相互作用之间的有利相互作用是必要的。与铁磁skyrmion相反,它们的反铁磁对应物不能被外部磁场诱导,因此必须实现反铁磁状态和亚稳反铁磁skyrmion之间的局部操纵,我们已经确定了超薄磁性氧化物膜的材料类作为有前途的稳定和操纵的反铁磁skyrmion。取决于制备条件,可以将不同量的氧掺入磁性膜的表面层中,从而能够调节磁性,以实现有利的相互作用,用于稳定反铁磁skyrmions。许多超薄磁性氧化物膜是极性的,因此它们本质上放大了局部电场对自旋织构的影响,促进了对磁性状态的局部操纵。我们将使用自旋极化扫描隧道显微镜在低温下表征模型型超薄氧化物薄膜的磁序。这种实验方法特别适合于研究原子尺度的磁态,因为它结合了自旋灵敏度和原子分辨率。此外,探针尖端将被用来局部创建和湮灭粒子状的反铁磁skyrmions与垂直电流或电场。
项目成果
期刊论文数量(0)
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Dr. Kirsten von Bergmann其他文献
Dr. Kirsten von Bergmann的其他文献
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{{ truncateString('Dr. Kirsten von Bergmann', 18)}}的其他基金
The transition from quantum to classical magnetism investigated by scanning tunneling microscopy
通过扫描隧道显微镜研究从量子到经典磁性的转变
- 批准号:
62871544 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Research Fellowships
Magnetic ground states and higher-order interactions beyond monolayers
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- 批准号:
418425860 - 财政年份:
- 资助金额:
-- - 项目类别:
Research Grants
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