Hybrid supercapacitors for reversible control of magnetism.
Hybrid supercapacitors for reversible control of magnetism.
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DOI：
10.1038/ncomms15339
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发表时间：
2017-05-10
影响因子：
16.6
通讯作者：
Hahn H
中科院分区：
文献类型：
--
作者：
Molinari A;Leufke PM;Reitz C;Dasgupta S;Witte R;Kruk R;Hahn H
针对新一代低功率自旋电子学和微电子学的发展，磁场的电场调谐是近年来最热门的研究课题之一。然而，具有适合于简单和精确的器件操作的通断比的可逆磁电效应还有待实现。在这里，我们提出了一种新的途径，通过混合超级电容器的充放电过程，包括静电(双电层电容)和电化学(伪电容)掺杂，来稳健地调节磁性。我们使用两种充电机制--发生在La0.74Sr0.26MnO_3/离子液体界面上--来控制La1−xSrxMnO_3铁磁和非铁磁相之间的平衡，达到了前所未有的程度。当施加大约2.0≈V的外部电势时，在室温以上达到高达 33%的磁调制。我们的案例研究旨在引起人们对磁电超级电容器这一相当未知的领域中新的、可逆的物理化学现象的关注。电子控制磁性的能力可能会使新一代低功率电子设备成为可能。在这里，作者指出，超级电容器的充放电是实现可逆室温磁电效应的有力工具。
Electric field tuning of magnetism is one of the most intensely pursued research topics of recent times aiming at the development of new-generation low-power spintronics and microelectronics. However, a reversible magnetoelectric effect with an on/off ratio suitable for easy and precise device operation is yet to be achieved. Here we propose a novel route to robustly tune magnetism via the charging/discharging processes of hybrid supercapacitors, which involve electrostatic (electric-double-layer capacitance) and electrochemical (pseudocapacitance) doping. We use both charging mechanisms—occurring at the La0.74Sr0.26MnO3/ionic liquid interface to control the balance between ferromagnetic and non-ferromagnetic phases of La1−xSrxMnO3 to an unprecedented extent. A magnetic modulation of up to ≈33% is reached above room temperature when applying an external potential of only about 2.0 V. Our case study intends to draw attention to new, reversible physico-chemical phenomena in the rather unexplored area of magnetoelectric supercapacitors. The ability to electrically control magnetism could enable a new generation of low-power electronic devices. Here the authors show that charging and discharging of supercapacitors are powerful tools to achieve reversible above-room-temperature magnetoelectric effects.