Giant electrostatic modification of magnetism via electrolyte-gate-induced cluster percolation in L a 1 − x S r x Co O 3 − δ

Jeff Walter, T. Charlton, Hailemariam Ambaye, M. R. Fitzsimmons, Peter P. Orth, R. M. Fernandes, Chris Leighton

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

lectrical control of magnetism is a long-standing goal in science and technology, with the potential to enable a next generation of low-power memory and logic devices. Recently developed electrolyte gating techniques provide a promising route to realization, although the ultimate limits on modulation of magnetic properties remain unknown. Here, guided by a recent theoretical prediction, we demonstrate large enhancement of electrostatic modulation of ferromagnetic order in ion-gel-gated ultrathin films of the perovskite La0.5Sr0.5CoO3-δ by thickness tuning to the brink of percolation. Application of only 3-4 V is then shown capable of inducing a clear percolation transition from a short-range magnetically ordered insulator to a robust long-range ferromagnetic metal with perpendicular magnetic anisotropy. This realizes giant electrostatic Curie temperature modulation over a 150 K window, outstanding values for both complex oxides and electrolyte gating. In operando polarized neutron reflectometry confirms gate-controlled ferromagnetism, additionally demonstrating, surprisingly, that electrostatically induced magnetic order can penetrate substantially deeper than the Thomas-Fermi screening length.
Original languageEnglish (US)
Article number111406
JournalPhysical Review Materials
Volume2
Issue number11
DOIs
StatePublished - Nov 30 2018

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Magnetism
Electrolytes
Electrostatics
Modulation
electrolytes
electrostatics
modulation
Logic devices
Ferromagnetic materials
Ultrathin films
Ferromagnetism
Magnetic anisotropy
Curie temperature
Perovskite
Oxides
ferromagnetism
logic
Magnetic properties
Screening
Neutrons

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Giant electrostatic modification of magnetism via electrolyte-gate-induced cluster percolation in L a 1 − x S r x Co O 3 − δ. / Walter, Jeff; Charlton, T.; Ambaye, Hailemariam; Fitzsimmons, M. R.; Orth, Peter P.; Fernandes, R. M.; Leighton, Chris.

In: Physical Review Materials, Vol. 2, No. 11, 111406, 30.11.2018.

Research output: Contribution to journalArticle

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AU - Walter, Jeff

AU - Charlton, T.

AU - Ambaye, Hailemariam

AU - Fitzsimmons, M. R.

AU - Orth, Peter P.

AU - Fernandes, R. M.

AU - Leighton, Chris

PY - 2018/11/30

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