Emergent electromagnetic induction beyond room temperature
Emergent electromagnetic induction beyond room temperature
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DOI：
10.1073/pnas.2105422118
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
A. Kitaori;N. Kanazawa;T. Yokouchi;F. Kagawa;N. Nagaosa;Y. Tokura
中科院分区：
文献类型：
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作者：
A. Kitaori;N. Kanazawa;T. Yokouchi;F. Kagawa;N. Nagaosa;Y. Tokura
利用螺旋自旋织构的电流感应运动产生的涌现电场的涌现电感器具有实现电感元件的显著小型化的潜力。通过使用近年来作为可果美晶格磁性材料而备受关注的YMn6Sn6，我们实现了应急电感器的室温操作。这种微米级涌现电感器装置不仅显示出与市售产品一样大的电感，而且还显示出电感的符号变化，这是以前未描述的现象。基于非共线自旋态电动力学的突现电磁感应可以使广泛应用于电路中的电感元件显著小型化，但该研究仍处于起步阶段，许多问题必须解决才能实现其应用。其中一个问题是如何将工作温度提高到室温，并且可能的热扰动对涌现感应的量子过程的影响是未知的。我们在这里报告了在室温附近和室温以上实现的大的电磁感应，利用几十微米大小的设备，基于高温（高达330 K）和短周期（≤ 3 nm）的金属helimagnet的自旋螺旋状态。观察到的电感值L及其符号被观察到在很大程度上变化，不仅取决于由温度和施加的磁场控制的自旋螺旋结构，而且取决于施加的电流密度。目前发现的室温操作和可能的符号控制的L可能提供一个步骤，实现微尺度量子电感器的基础上出现的电磁自旋螺旋状态。
Significance Emergent inductors that utilize emergent electric fields generated by the current-induced motion of spiral spin textures have the potential to realize dramatic miniaturization of inductance elements. By using YMn6Sn6, which has been attracting attention as a kagome lattice magnetic material in recent years, we have realized the room-temperature operation of emergent inductors. This micron-scale emergent inductor device shows not only an inductance as large as a commercially available product but also a sign change of inductance, which is a previously undescribed phenomenon. Emergent electromagnetic induction based on electrodynamics of noncollinear spin states may enable dramatic miniaturization of inductor elements widely used in electric circuits, yet the research is still in its infancy and many issues must be resolved toward its application. One such problem is how to increase working temperature to room temperature, and possible thermal agitation effects on the quantum process of the emergent induction are unknown. We report here large emergent electromagnetic induction achieved around and above room temperature, making use of a few tens of micrometer-sized devices based on the high-temperature (up to 330 K) and short-period (≤ 3 nm) spin-spiral states of a metallic helimagnet. The observed inductance value L and its sign are observed to vary to a large extent, depending not only on the spin-helix structure controlled by temperature and applied magnetic field but also on the applied current density. The present finding on room-temperature operation and possible sign control of L may provide a step toward realizing microscale quantum inductors on the basis of emergent electromagnetism in spin-helix states.