Title :
Magnetization and AC Susceptibility Study of Nb/Ni/Nb Thin Films
Author :
Badilla, Juan Pablo ; de Lascio, Eduardo Roberto ; Cornejo, Daniel R.
Author_Institution :
Inst. de Fis., Univ. de Sao Paulo, São Paulo, Brazil
Abstract :
A study on the behavior of the magnetization and the ac susceptibility in Nb(40 nm)/Ni(x nm)/Nb(40 nm) thin films was carried out. It was observed that the hysteresis loops of these heterostructures show oscillations of the magnetization in regions of magnetic field where the irreversible reversal of the magnetization of the ferromagnet occurs. This behavior appears to show a coupling between the magnetic fields generated by the vortex in the Nb and the magnetization of the Ni nanograins. The analysis of the real and imaginary components of the ac susceptibility in the tri-layers shows no uniform results in relation to Ni layer thickness. However, the critical temperatures calculated from both components at zero applied field show an oscillation with respect to the Ni layer thickness.
Keywords :
magnetic hysteresis; magnetic susceptibility; magnetic thin films; magnetisation reversal; nickel; niobium; AC susceptibility; Nb-Ni-Nb; heterostructures; hysteresis loops; irreversible reversal magnetization; magnetic field; magnetic fields; thin films; Magnetic hysteresis; Magnetic susceptibility; Magnetization; Nickel; Niobium; Superconducting magnets; Temperature measurement; AC susceptibility; niobium-nickel films; superconductor-ferromagnet hybrids;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2013.2261056