Evidence of modified ferromagnetism at a buried Permalloy/CoO interface at room temperature

Abstract

We have used magnetometry and resonant soft x-ray magnetic reflectometry to determine the depth-dependent charge and magnetization density on an absolute scale across a Permalloy/CoO interface above the N\'eel temperature of CoO. A thin magnetic layer of $1.0\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ forms at the interface. This layer has larger magnetization density and different temperature dependence of magnetization than Permalloy.