Giant electrostatic modification of magnetism via electrolyte-gate-induced cluster percolation in La1−xSrxCoO3−δ

Thumbnail Image
Walter, Jeff
Charlton, T.
Ambaye, H.
Fitzsimmons, M. R.
Fernandes, R. M.
Leighton, Chris
Major Professor
Committee Member
Journal Title
Journal ISSN
Volume Title
Orth, Peter
Associate Professor
Research Projects
Organizational Units
Organizational Unit
Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

Organizational Unit
Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
Journal Issue
Is Version Of

Electrical 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.


This article is published as Walter, Jeff, T. Charlton, H. Ambaye, M. R. Fitzsimmons, Peter P. Orth, R. M. Fernandes, and Chris Leighton. "Giant electrostatic modification of magnetism via electrolyte-gate-induced cluster percolation in La1−xSrxCoO3−δ." Physical Review Materials 2, no. 11 (2018): 111406. DOI: 10.1103/PhysRevMaterials.2.111406. Posted with permission.

Subject Categories
Mon Jan 01 00:00:00 UTC 2018