[论文解读] Antiferromagnetic opto-spintronics: Part of a collection of reviews on antiferromagnetic spintronics

Petr Němec, M. Fiebig+2 more|arXiv (Cornell University)|May 30, 2017

Multiferroics and related materials参考文献 119被引用 156

一句话总结

本文综述了电磁辐射如何用于探测和操控反铁磁材料中的自旋序，着重介绍未来的主题，如自旋泵浦、太赫兹自旋动力学，以及多铁极性序参数翻转。

ABSTRACT

Control and detection of spin order in ferromagnets is the main principle allowing storing and reading of magnetic information in nowadays technology. The large class of antiferromagnets, on the other hand, is less utilized, despite its very appealing features for spintronics applications. For instance, the absence of net magnetization and stray fields eliminates crosstalk between neighbouring devices and the absence of a primary macroscopic magnetization makes spin manipulation in antiferromagnets inherently faster than in ferromagnets. However, control of spins in antiferromagnets requires exceedingly high magnetic fields, and antiferromagnetic order cannot be detected with conventional magnetometry. Here we provide an overview and illustrative examples of how electromagnetic radiation can be used for probing and modification of the magnetic order in antiferromagnets. Spin pumping from antiferromagnets, propagation of terahertz spin excitations, and tracing the reversal of the antiferromagnetic and ferroelectric order parameter in multiferroics are anticipated to be among the main topics defining the future of this field.

研究动机与目标

• 激发将反铁磁材料用于自旋电子学应用的优势，如缺乏净磁化和降低串扰。
• 展示电磁辐射如何用于探测和修改反铁磁序。
• 突出塑造未来反铁磁光自旋电子学的关键现象和实验方法。
• 举例说明相关材料中自旋动力学以及耦合铁极性序的示例。

提出的方法

• 讨论光学和 THz 辐射与反铁磁序相互作用的概念与机制。
• 给出光致自旋动力学的示例和实验观测。
• 概述用于探测反铁磁序参数的潜在实验途径和测量技术。

实验结果

研究问题

• RQ1 电磁辐射通过哪些机制来控制反铁磁自旋序？
• RQ2 光学和 THz 技术如何探测与表征反铁磁动力学和序参量？
• RQ3 自旋泵浦与太赫兹自旋激发在反铁磁自旋电子学中扮演何种角色？
• RQ4 多铁电耦合如何使追踪反铁磁与铁电序参量的翻转成为可能？

主要发现

• 电磁辐射为探测与修改反铁磁序提供了在不依赖大磁场的情况下的途径。
• 太赫兹自旋激发和自旋泵浦被确认为未来反铁磁自旋电子学的核心议题。
• 在多铁性材料中追踪耦合的反铁磁与铁电序参量翻转被强调为一个关键研究领域。