Fig. 4: Wireless magneto-ionic control of magnetism probed by soft X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD).
From: Wireless magneto-ionics: voltage control of magnetism by bipolar electrochemistry
Co L2,3-edge XAS spectra, a, and XMCD, b, of the as-sputtered and actuated (applying driving voltages of 15 V and 20 V for 15 min) CoN films, represented by black, red and blue lines, respectively. The reference spectra of low-spin (LS) Co3+, high-spin (HS) Co2+, and metallic Co are shown in the bottom panel of a. The three panels on the right show enlarged views of the dashed rectangular areas, A, B, and C, in a. All XAS spectra are vertically shifted for clarity. The vertical dashed lines mark the appearance of reduced Co2+ peak. The black downward arrows denote the shift of Co L3 maximum.
