All-electrochemical voltage-control of magnetization in metal oxide/metal nanoislands
All-electrochemical voltage-control of magnetization in metal oxide/metal nanoislands
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DOI：
10.1039/c8tc01994k
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发表时间：
2018-08-21
影响因子：
6.4
通讯作者：
Leistner, Karin
中科院分区：
文献类型：
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作者：
Duschek, Kenny;Petr, Andreas;Leistner, Karin
低功率磁电子器件的巨大前景引发了针对磁电压控制的重大研究活动。在这一领域，离子迁移和可逆电化学反应目前为电压可重编程磁性材料开辟了道路。到目前为止，这种氧化物/金属异质结构的电化学操控主要是针对通过物理方法制备的薄膜进行报道。本研究描述了利用电沉积 FeOx/Fe 纳米岛作为起始状态的全电化学路线。在 KOH 溶液中实现了铁磁性 Fe 和 FeOx 之间的可重复电化学转化，并用于纳米岛磁化的电压控制。对于尺寸为几纳米的最小纳米岛，通过原位传输和铁磁共振测量可以检测到室温下几乎完全电压感应的磁性开/关切换。与连续薄膜相比，观察到的效果有所增强，这表明形态是电化学电压控制磁性的影响因素。全电化学方法对于扩展电压可编程磁性材料的应用可能性具有决定性作用，因为通过电化学沉积，可以克服几何限制，并且可以实现 3D 结构的功能化。
The great prospects for low-power magnetoelectronic devices trigger significant research activity aiming at voltage-control of magnetism. In this field, ion migration and reversible electrochemical reactions currently open a pathway to voltage-reprogrammable magnetic materials. Up to now, such electrochemical manipulation of oxide/metal heterostructures is mainly reported for thin films prepared by physical methods. The present study describes an all-electrochemical route by utilizing electrodeposited FeOx/Fe nanoislands as a starting state. Repeatable electrochemical conversion between ferromagnetic Fe and FeOx is achieved in KOH solution and exploited for voltage control of the magnetization of the nanoislands. For the smallest nanoislands, exhibiting dimensions of a few nanometers, almost complete voltage-induced ON/OFF switching of magnetism at room temperature is detected by in situ transport and ferromagnetic resonance measurements. The observed effects are enhanced in comparison to those of continuous films, which points at the morphology as an influencing factor of electrochemical voltage control of magnetism. The all-electrochemical approach is decisive for extending the application possibilities for voltage-programmable magnetic materials, because, by electrochemical deposition, geometry restrictions can be overcome and 3D structures can be functionalized.