INFLUENCE OF PULSED MAGNETIC FIELDS ON UNIAXIAL STRESS OF FILMS

WE PROPOSE A SPECIFIC PROCEDURE BY WHICH PULSED MAGNETIC FIELDS ARE APPLIED TO RELIEVE STRESS IN AMORPHOUS MAGNETIC FILMS OF FE B SI IN AN INITIAL INVESTIGATION. THE ADVANTAGE OF THIS MAGNETIC FILM SYSTEM IS THAT IT EXHIBITS A WELL DEFINED UNIAXIAL STRESS AXIS AND THE MICROSTRUCTURE, MAGNETIC AND MECHANICAL PROPERTIES ARE WELL CHARACTERIZED. IN OUR PROCEDURE A PULSED MAGNETIC FIELD IS APPLIED ALONG AND NORMAL TO THE STRESS AXIS. STRESS AMPLITUDE AND AXIS DIRECTION ARE MEASURED AS A FUNCTION OF ANNEALING FIELD AMPLITUDE, TEMPERATURE AND PULSE TIME DURATION. A THEORETICAL MODEL INVOLVING THE COUPLING OF MAGNETIC FIELD TO THE LOCAL MICROSTRUCTURE (VIA MAGNETOSTRICTION) OF THE FILM WILL BE DEVELOPED TO EXPLAIN THE STRESS RELIEF MECHANISM IN AMORPHOUS MAGNETIC FILMS.