Fig. 2
From: Electric-field control of ferromagnetism through oxygen ion gating
Room-temperature electric-field control of magnetism. a Longitudinal Kerr signals of pristine Co/SrCoO2.5 devices with different Co thicknesses. b, c Comparison of the room-temperature magnetic hysteresis loops of Co/SrCoO2.5 devices at high-resistance (red) and low-resistance (navy blue) states with the thickness of Co layer at b 2.0 nm and c 6.0 nm. d Reversible modulation of the magnetic coercive field for ~6 nm Co sample with different resistance states. The switching voltages are +8 and −10 V with a duration of 0.6 ms for the HRS and the LRS, respectively. The pads with diameter of ~80 μm were chosen for the studies, and the distance between the tungsten probe and the laser spot was set at ~20 μm
