Fig. 6
From: Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect
Hydrogen diffusion across a defect site. a By subtracting the negative from the positive remanence state (i.e., the differential image of (Mr+ − Mr−)), Kerr images were sequentially taken at different times when hydrogen diffused across a defect area. b, c Remanence to saturation ratio Mr/Ms recorded at various X positions along lines A and B, as indicated in a. The curves correspond to different times after the start of hydrogen absorption from the bared Co25Pd75. d Left axis: position of the 2% H/M (H/M: atomic hydrogen (H) to metal (M) ratio) front in normal area (line A) and across the defect (line B) plotted as a function of time; right axis: difference between the 2% H/M front position on lines A and B. The error bars are determined by the uncertainty in 2% H/M front positions
