Abstract
We demonstrate magnetic switching between two360° domain wall vortex states in cobalt nanorings, which are candidate magnetic states forrobust and low power magnetoresistive random access memory (MRAM) devices. These360° domain wall (DW) or ‘twisted onion’ states can have clockwise or counterclockwisecirculation, the two states for data storage. Reliable switching between the states isnecessary for any realistic device. We accomplish this switching by applying acircular Oersted field created by passing current through a metal atomic forcemicroscope tip placed at the center of the ring. After initializing in an onionstate, we rotate the DWs to one side of the ring by passing a current through thecenter, and can switch between the two twisted states by reversing the current,causing the DWs to split and meet again on the opposite side of the ring. A largercurrent will annihilate the DWs and create a perfect vortex state in the rings.
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