Title :
Thermal wave interactions in magnetic materials
Author :
Carey, R. ; Newman, D.M. ; Wiggins, J.
Author_Institution :
Centre for Data Storage Mater., Coventry Univ., UK
fDate :
7/1/1998 12:00:00 AM
Abstract :
A technique to sense the magnetic characteristics of the individual layers of a multilayer structure is demonstrated. It detects the interaction between a thermal wave and the magnetization dependent thermal transport properties of the medium. A modulated laser beam is used to generate a thermal wave at the surface of a thin film sample and launch it into the medium. The amplitude and phase of the wave are modulated by the thermal properties of the medium as it propagates. Initial results for a AgNiFe magnetic thin film under a non-magnetic overlayer have successfully measured the magnetization dependent thermal conductivity. The measurements agree well with those obtained from the magnetization dependent resistivity
Keywords :
discontinuous metallic thin films; giant magnetoresistance; iron alloys; magnetic multilayers; magnetic thin films; magnetic variables measurement; magnetisation; magnetocaloric effects; nickel alloys; photothermal effects; silver alloys; thermal conductivity; thermal conductivity measurement; AgNiFe; giant magnetoresistance medium; granular film; individual layer; magnetic characteristics sensing; magnetic materials; magnetization dependent thermal conductivity; magnetization dependent thermal transport properties; modulated laser beam; multilayer structure; nonmagnetic overlayer; periodic localised heating; thermal wave interactions; thin film sample surface; Laser beams; Magnetic materials; Magnetic multilayers; Magnetic properties; Magnetization; Optical modulation; Surface emitting lasers; Surface waves; Thermal conductivity; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
