Abstract
Very thin FeNi films are coupled over nonmagnetic interfacees of varied thickness to bulk FeNi generating exchange couplings /J of varied strength on a path perpendicular to the surface. The relative magnetization M(T)/M(0) decreases faster at low T for /J≠0 than for /J=0. This implies a scarcity of spin waves in uncoupled films which we show to be very likely a universal property of ultrathin 2D ferromagnets on a nonmagnetic substrate.
- Received 28 October 1988
DOI:https://doi.org/10.1103/PhysRevLett.62.1900
©1989 American Physical Society