Giant Electrostatic Modification of Magnetism via Electrolyte-Gate-Induced Cluster Percolation in La$_{1-x}$Sr$_x$CoO$_{3-δ}$

Jeff Walter; T. Charlton; H. Ambaye; M. R. Fitzsimmons; Peter P. Orth; R. M. Fernandes; Chris Leighton

doi:10.1103/PhysRevMaterials.2.111406

paper

Giant Electrostatic Modification of Magnetism via Electrolyte-Gate-Induced Cluster Percolation in La $_{1 - x}$ Sr $_{x}$ CoO $_{3 - δ}$

arXiv:1807.09364 · doi:10.1103/PhysRevMaterials.2.111406

Abstract

Electrical control of magnetism is a long-standing goal in physics and technology, recently developed electrolyte gating techniques providing a promising route to realization. Validating a recent theoretical prediction, here we demonstrate large enhancement of electrostatic modulation of ferromagnetic order in ion-gel-gated ultrathin La $_{0.5}$ Sr $_{0.5}$ CoO $_{3 - δ}$ by thickness-tuning to the brink of a magnetic percolation transition. Application of only 3-4 V then drives a transition from a short-range-ordered insulator to a robust long-range ferromagnetic metal, realizing giant electrostatic Curie temperature modulation over a 150 K window. In operando polarized neutron reflectometry confirms gate-controlled ferromagnetism, also demonstrating unusually deep penetration of induced magnetization, in further agreement with theory.

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Giant Electrostatic Modification of Magnetism via Electrolyte-Gate-Induced Cluster Percolation in La $_{1 - x}$ Sr $_{x}$ CoO $_{3 - δ}$

Abstract

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Giant Electrostatic Modification of Magnetism via Electrolyte-Gate-Induced Cluster Percolation in La1−x​Srx​CoO3−δ​

Abstract

References in corpus (6)

Cited by in corpus (5)

Giant Electrostatic Modification of Magnetism via Electrolyte-Gate-Induced Cluster Percolation in La $_{1 - x}$ Sr $_{x}$ CoO $_{3 - δ}$