Hybrid supercapacitors for reversible control of magnetism

Alan Molinari (), Philipp M. Leufke, Christian Reitz, Subho Dasgupta, Ralf Witte, Robert Kruk and Horst Hahn ()
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Alan Molinari: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Philipp M. Leufke: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Christian Reitz: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Subho Dasgupta: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Ralf Witte: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Robert Kruk: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
Horst Hahn: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/ncomms15339

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