Voltage-induced changes in magnetism of feco/batio3 thin films studied by X-ray absorption spectroscopy

Abstract

Voltage-induced changes in the magnetic properties of FeCo thin films grown on a BaTiO3 substrate are investigated by means of the X-ray magnetic circular dichroism (XMCD). The magnetization curves show different effects of the applied voltages depending on the Fe-Co compositions, which are ranging from Fe67Co33 to Fe25Co75. The XMCD spectra suggest that magnetization of the Fe50Co50 film at the saturation state are different between the positive and negative applied voltages, while those for other compositions have no detectable dependence on the applied voltage. The peculiar behavior for Fe50Co50 could be related to the abrupt change in the density of state at the Fermi level.