Abstract
We present an approach to probe the magnetization inside superconducting films using ultrathin 57Fe probe layers excited by synchrotron radiation. We investigate the evolution of the 57Fe hyperfine field orientation as a function of magnetic field above and below the superconducting transition temperature Tc for a Nb(50 nm)/57Fe(0.6 nm)/Nb(50 nm) trilayer. It is found that significant screening of the external field in the superconductor occurs only at low field, leading to a change in the hyperfine field angle below Tc. The presented approach allows to study the influence of magnetic fields and vortex induced electron correlations in complex layered structures incorporating superconductors.
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