Authors: D Stamopoulos E Aristomenopoulou E Manios D Niarchos
Publish Date: 2013/01/27
Volume: 26, Issue: 5, Pages: 1931-1938
Abstract
The superconducting magnetoresistance effect SMRE observed in trilayers TLs consisting of a superconducting SC Nb interlayer and two outer ferromagnetic FM Ni80Fe20 and Co layers is studied We observed that the SMRE exhibits a pronounced magnitude R max−R min/R nor of order 45 and 86 for the NiFebased and Cobased TLs respectively For the NiFebased TLs the dynamic transport behavior of the observed SMRE is presented through detailed I–V characteristics that exhibit a nonlinear character even extremely close to the critical temperature T cmathrmSC Also the detailed evolution of the longitudinal and transverse components of the TL magnetization from close to well below T cmathrmSC is presented For the Cobased TLs the obtained magnetization and transport data justify that a strict requisite for the observation of a pronounced SMRE across T cmathrmSC is that the coercivities of the FM layers should be similar The combined data on the NiFebased and Cobased TLs show that across the superconducting transition the SMRE is influenced by outofplane strayfields attaining pronounced values when the respective coercive fields coincide thus enabling the transverse magnetic coupling of the outer FM layers through the SC interlayer
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