铁磁性
抗磁性
凝聚态物理
反铁磁性
磁性
材料科学
电压
物理
磁场
量子力学
作者
Jeff Walter,Bryan Voigt,Ezra Day-Roberts,Kei Heltemes,Rafael M. Fernandes,Turan Birol,Chris Leighton
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2020-07-29
卷期号:6 (31)
被引量:41
标识
DOI:10.1126/sciadv.abb7721
摘要
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.
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