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. 2016 Aug 19;7:12398. doi: 10.1038/ncomms12398

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Copyright © 2016, The Author(s)

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(a,c,e,g) PEEM images of the switching filament in the LRS, HRS, LRS II and HRS II, respectively (indicated by the black arrow) for a photon energy of 531.6 eV (peak A). Scale bars, 1 μm. (b,d,f,h) O K-edge for the switching filament in a,c,e,g (green and blue lines for the LRS and HRS, respectively) and the surrounding device area (black lines). (i) Device resistance and (j) normalized A/B₂ ratio as a function of the device state.