Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy
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Beach_Magneto-ionic effect.pdf
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Author(s)
Bertacco, R.
Baldrati, Lorenzo
Tan, Aik Jun
Mann, Maxwell
Beach, Geoffrey Stephen
Date Issued
January 2017
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Baldrati, L. et al. “Magneto-Ionic Effect in CoFeB Thin Films with in-Plane and Perpendicular-to-Plane Magnetic Anisotropy.” Applied Physics Letters 110, 1 (January 2017): 012404 © 2017 Author(s)
Version
Final published version
Abstract
The magneto-ionic effect is a promising method to control the magnetic properties electrically. Charged mobile oxygen ions can easily be driven by an electric field to modify the magnetic anisotropy of a ferromagnetic layer in contact with an ionic conductor in a solid-state device. In this paper, we report on the room temperature magneto-ionic modulation of the magnetic anisotropy of ultrathin CoFeB films in contact with a GdO[subscript x] layer, as probed by polar micro-Magneto Optical Kerr Effect during the application of a voltage across patterned capacitors. Both Pt/CoFeB/GdO[subscript x] films with perpendicular magnetic anisotropy and Ta/CoFeB/GdO[subscript x] films with uniaxial in-plane magnetic anisotropy in the as-grown state exhibit a sizable dependence of the magnetic anisotropy on the voltage (amplitude, polarity, and time) applied across the oxide. In Pt/CoFeB/GdO[subscript x] multilayers, it is possible to reorient the magnetic anisotropy from perpendicular-to-plane to in-plane, with a variation of the magnetic anisotropy energy greater than 0.2 mJ m[subscript -2]. As for Ta/CoFeB/GdO[subscript x] multilayers, magneto-ionic effects still lead to a sizable variation of the in-plane magnetic anisotropy, but the anisotropy axis remains in-plane.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1063/1.4973475
