Journal
ACS NANO
Volume 14, Issue 7, Pages 8949-8957Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03750
Keywords
voltage-controlled magnetism; epitaxial SrCo1-xFexO3-delta; ionic liquid gating oxygen stoichiometry; self-assembled nanocomposite
Categories
Funding
- NSF [DMR-1419807]
- MIT MRSEC through the MRSEC Program of the National Science Foundation [DMR-1419807]
- DOE Office of Science [DE-AC02-06CH11357]
- National Key Research and Development Program [2016YFB0700402]
- National Natural Science Foundation of China [11834009, 51761135131, 52011530124, 51822105, 51671112, 51788104]
- City University of Hong Kong [9610484]
- City University of Hong Kong Shenzhen Research Institute
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Searching for new materials and phenomena to enable voltage control of magnetism and magnetic properties holds compelling interest for the development of low-power nonvolatile memory devices. In particular, reversible and nonvolatile ON/OFF controls of magnetism above room temperature are highly desirable yet still elusive. Here, we report on a nonvolatile voltage control of magnetism in epitaxial SrCo1-xFexO3-delta (SCFO). The substitution of Co with Fe significantly changes the magnetic properties of SCFO. In particular, for the Co/Fe ratio of similar to 1:1, a switch between nonmagnetic (OFF) and ferromagnetic (ON) states with a Curie temperature above room temperature is accomplished by ionic liquid gating at ambient conditions with voltages as low as +/- 2 V, even for films with thickness up to 150 nm. Tuning the oxygen stoichiometry via the polarity and duration of gating enables reversible and continuous control of the magnetization between 0 and 100 emu/cm(3) (0.61 mu(B)/f.u.) at room temperature. In addition, SCFO was successfully incorporated into self-assembled two-phase vertically aligned nanocomposites, in which the reversible voltage control of magnetism above room temperature is also attained. The notable structural response of SCFO to ionic liquid gating allows large strain couplings between the two oxides in these nanocomposites, with potential for voltage-controlled and strain-mediated functionality based on couplings between structure, composition, and physical properties.
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