Accession Number : AD0422586

Title :   INFLUENCE OF ANISOTROPY DISPERSION ON MAGNETIC PROPERTIES OF NI-FE FILMS,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Cohen, Mitchell S.

Report Date : 17 JAN 1963

Pagination or Media Count : 7

Abstract : The dispersion of the magnetic anisotropy was monotonically increased in several Ni-Fe films by subjecting them to increasingly severe heat treatments, and the room-temperature magnetic properties were monitored after each anneal by Lorentz electron microscopy. A gradual transition towards increasingly anomalous properties in a single film was thereby observed. An increase, with annealing, of the magnetization ripple intensity, the measured angular anisotropy dispersion, and the wall coercieve force Hw was found. After sufficient annealing, locking was seen upon reversal parallel to the easy axis; further annealing increased the locking-wall density. The anisotropy field Hk monotonically decreased with annealing until the uniaxial character of the film was lost and it became a rotatable-initial-susceptibility (RIS) film. Reversal at azimuths away from the easy axis proceeded by labyrinth propagation after the early anneals, but by partial rotation after more severe annealing. (Author)

Descriptors :   (*FILMS, MAGNETIC PROPERTIES), (*ANISOTROPY, FILMS), ELECTRON MICROSCOPY, VAPOR PLATING, ALLOYS, NICKEL ALLOYS, IRON ALLOYS, HEAT TREATMENT.

Distribution Statement : APPROVED FOR PUBLIC RELEASE