Layered Switching Devices (6920380667)
When two electrodes (top and bottom layers) whose magnetic orientation is the same (indicated by arrows) are separated by thin layers of copper (orange) and tantalum oxide (blue), a filament of copper forms through the oxide when there is a potential difference of 1 to 1.5 volts across the electrodes. When the filament forms, current can flow easily between the two electrodes. The findings help solve the mystery of why the layered structure can form electronic switches that maintain their on/off state when the power is off.
See also www.nist.gov/pml/div683/switches-022112.cfm
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