Reversibly controlled magnetic domains of Co film via electric field driven oxygen migration at nanoscale

Pravarthana Dhanapal, Tuo Zhang, Baomin Wang, Huali Yang, Haicheng Xuan, Chong Bi, Weigang Wang, Run Wei Li

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Electric field control of perpendicular magnetic anisotropy (PMA) can enable low power consumption for perpendicular magnetic random access memory devices. However, the tuning of PMA by the electric field in ferromagnetic metal thin films is less efficient and limited to the interface due to the screening effect. Alternatively, the magnetoionic effect can control PMA efficiently, which utilizes ion migrations over the surface of the ferromagnetic metal by interfacing it with the charge reservoir of oxygen ions like GdOx. In this paper, we report the reversibly controlled magnetic domains of PMA Co in the Pt/Co/GdOx trilayer via the electric field at the nanoscale using conductive atomic force microscopy and magnetic force microscopy (MFM). The magnetic domain phase values determined by MFM decrease and increase when negative and positive bias voltages of magnitude 4 V are applied to the surface of GdOx, respectively. These results suggest a path toward control of PMA materials at the nanoscale by the electric field for information storage devices.

Original languageEnglish (US)
Article number232401
JournalApplied Physics Letters
Issue number23
StatePublished - Jun 10 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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