Fig. 1.
Adsorption and switching of Co on BP. a Six Co species on BP as deposited at T < 5 K (Vs = −400 mV, It = 20 pA, scale bar = 1 nm). Boxed atoms show species related through mirror plane along [010]. b Four atoms from a have been switched into JH,low (Vs = −400 mV, It = 20 pA, scale bar = 1 nm). c Two atoms from b have been switched into JH,high (Vs = −400 mV, It = 20 pA, scale bar = 1 nm). d Switching characteristics from JH,low to JH,high with Vs = 420 mV and e JH,high to JH,low with Vs = −680 mV. Approximate threshold biases for switching (Vth) are noted. Orange circles indicate the tip position during the switching sequence. The inset images showing before and after configurations are 4 nm × 4 nm in size. f Schematic representation of adsorption energy curves for Co species on BP