Voltage-induced ferromagnetism in a diamagnet

Jeff Walter, Bryan Voigt, Ezra Day-roberts, Kei Heltemes, Rafael M. Fernandes, Turan Birol, Chris Leighton

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Increasingly impressive demonstrations of voltage-controlled magnetism have been achieved recently, highlighting potential for low-power data processing and storage. Magnetoionic approaches appear particularly promising, electrolytes and ionic conductors being capable of on/off control of ferromagnetism and tuning of magnetic anisotropy. A clear limitation, however, is that these devices either electrically tune a known ferromagnet or electrically induce ferromagnetism from another magnetic state, e.g., antiferromagnetic. Here, we demonstrate that ferromagnetism can be voltage-induced even from a diamagnetic (zero-spin) state suggesting that useful magnetic phases could be electrically induced in "nonmagnetic" materials. We use ionic liquid-gated diamagnetic FeS2 as a model system, showing that as little as 1 V induces a reversible insulator-metal transition by electrostatic surface inversion. Anomalous Hall measurements then reveal electrically tunable surface ferromagnetism at up to 25 K. Density functional theory-based modeling explains this in terms of Stoner ferromagnetism induced via filling of a narrow eg band.

Original languageEnglish (US)
Pages (from-to)eabb7721
JournalScience Advances
Volume6
Issue number31
DOIs
StatePublished - Jul 1 2020

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 7

PubMed: MeSH publication types

  • Journal Article

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