Field-temperature evolution of the magnetic state of [Fe(1.2 Å)/Cr(10.5 Å)]30 structure by Mössbauer reflectometry with synchrotron radiation

Abstract Nanostructured epitaxial [ 57 Fe(1.2 A)/Cr(10.5 A)] 30 multilayer with ultrathin Fe layers, demonstrated Kondo-like behavior, has been investigated by means of the nuclear resonance reflectivity at low temperatures (down to 4 K) in magnetic fields up to 4 T. We detected the beginning of the magnetic phase transition at 150 K which correlates with the minimum on the electrical resistivity curve. The determined magnetic hyperfine field distribution P( B hf ) indicates an inhomogeneity of the iron environments. When we apply the very high external magnetic field up to 4 T, it aligns B hf (i) along the direction of the external field only partially. Also it has been noticed that B hf (i) orientations depend on the magnetic pre-history.