Voltage-Controlled On/Off Switching of Ferromagnetism in Manganite Supercapacitors

Alan Molinari; Horst Hahn; Robert Kruk

doi:10.1002/adma.201703908

Voltage-Controlled On/Off Switching of Ferromagnetism in Manganite Supercapacitors

Adv Mater. 2018 Jan;30(1). doi: 10.1002/adma.201703908. Epub 2017 Nov 13.

Authors

Alan Molinari¹, Horst Hahn^{1

2}, Robert Kruk¹

Affiliations

¹ Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
² KIT-TUD-Joint Research Laboratory Nanomaterials, Technical University Darmstadt, Jovanka-Bontschits-Strasse 2, 64287, Darmstadt, Germany.

PMID: 29131421
DOI: 10.1002/adma.201703908

Abstract

The ever-growing technological demand for more advanced microelectronic and spintronic devices keeps catalyzing the idea of controlling magnetism with an electric field. Although voltage-driven on/off switching of magnetization is already established in some magnetoelectric (ME) systems, often the coupling between magnetic and electric order parameters lacks an adequate reversibility, energy efficiency, working temperature, or switching speed. Here, the ME performance of a manganite supercapacitor composed of a ferromagnetic, spin-polarized ultrathin film of La_0.74 Sr_0.26 MnO₃ (LSMO) electrically charged with an ionic liquid electrolyte is investigated. Fully reversible, rapid, on/off switching of ferromagnetism in LSMO is demonstrated in combination with a shift in Curie temperature of up to 26 K and a giant ME coupling coefficient of ≈226 Oe V^-1 . The application of voltages of only ≈2 V results in ultralow energy consumptions of about 90 µJ cm^-2 . This work provides a step forward toward low-power, high-endurance electrical switching of magnetism for the development of high-performance ME spintronics.

Keywords: LaSrMnO3; ionic liquid gating; magnetism; magnetoelectric effect; supercapacitors.