Abstract
We present a study of the upper critical magnetic field, H c2, and pinning force, F p, in superconducting (Nb)/spin glass (CuMn) multilayers. Patterned samples with different CuMn thicknesses and Mn concentrations were measured in both the perpendicular and the parallel magnetic field orientations. The behavior of the perpendicular upper critical field H c2⊥ was in agreement with the anisotropic Ginzburg–Landau theory, while the parallel upper critical field H c2‖ temperature dependence for highly anisotropic samples was nonlinear in the whole investigated temperature range. Grain boundary pinning mainly influences the perpendicular critical current density values independently on the multilayer anisotropy. For parallel magnetic field orientation, instead, the intrinsic vortex pinning on CuMn layers was dominant.
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