Abstract
We have studied the magnetization reversal of Co/Cu/NiFe giant-magnetoresistance (GMR) rhombic-ring structures by using electrical measurements and analytical calculations. GMR rhombic rings include magnetic domain walls (DWs) at the remanent state owing to their shape anisotropy. Therefore, the magnetization reversal evolves via DW motion caused by an external magnetic field. The rhombic ring has multiple intermediate states, such as vortex, hard-axis onion, and horseshoe states, making it difficult to recognize its specific magnetic configuration in the GMR measurements. Simple GMR calculations were employed to understand the magnetization reversal based on several prospective magnetic states, and the results were consistent with the experimental data.
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