Magnetometry in Ultrathin Films using Spin Polarized Cascade Electrons

Abstract

ABSTRACTIn this review, we show how spin polarized cascade electron spectroscopy provides a relatively rapid and flexible approach to the study of a variety of problems of current interest in both ultrathin magnetic films and surface magnetism. Specific examples relating to the non-bulk like magnetization behavior as a function of temperature of ultrathin films are given which lead to the conclusion that stabilization of the magnetization at low temperature is a universal characteristic of ultrathin magnetic films. Comparison between ultrathin film and surface magnetic behavior is made. Evidence is given that the weakening of exchange coupling both at the surface of a bulk sample and across magnetic spacer layers between an ultrathin magnetic thin film and a bulk sample can be evaluated and dramatic effects due to minute quantities of non-magnetic nearest neighbors are demonstrated.