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Combined first order reversal curve (FORC) analyses of the magnetization(M-FORC) and magnetoresistance (MR-FORC) have been employed to provide acomprehensive study of the M-MR correlation in two canonical systems: aNiFe/Cu/FePt pseudo spin-valve (PSV) and a [Co/Cu]8 multilayer. In the PSV, dueto the large difference in switching fields and minimal interactions betweenthe NiFe and FePt layers, the M and MR show a simple one-to-one relationshipduring reversal. In the [Co/Cu]8 multilayer, the correlation between themagnetization reversal and MR evolution is more complex. This is primarily dueto the similar switching fields of, and interactions between, the constituentCo layers. The FORC protocol accesses states with much higher spin disordersand larger MR than those found along the conventional major loop field-cycle.Unlike the M-FORC measurements, which only probe changes in the macroscopicmagnetization, the MR-FORCs are more sensitive to the microscopic domainconfigurations, as those are most important in determining the resultant MReffect size. This approach is generally applicable to spintronic systems torealize the maximum spin-disorder and the largest MR.

Accessing Different Spin-Disordered States using First Order Reversal Curves