Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Fluctuating Field Calculations for a Bimodal Medium



S Rao, Lawrence H. Bennett, Edward Della Torre, P J. Chen, R A. Fry


Bimodal magnetic behavior, has been observed in a multilayer film. In that film the Kerr rotation and ellipticity exhibit magneto-optic hystersis loops with two distinct field dependent steps so that there are four stable magnetization states. The magnetic aftereffects, of the two distinct types of decay at the two sets of holding fields, have been analyzed. Thus, it is possible to measure and calculate the two types of decays individually. We show that the shift in log time of the aftereffect curves for both the sets are linear. The fluctuation fields for the two states are calculated using these. We also show that the shape of the aftereffect curve is the same as the major hysteresis curve, which helps in finding the chemical potential. These are seen experimentally as well as theoretically using Preisach-Arrhenius model.
Journal of Applied Physics
No. 10


bimodal, chemical potential, cobalt-platinum, fluctuating fields, Kerr effect, magnetic multilayers


Rao, S. , Bennett, L. , Della Torre, E. , Chen, P. and Fry, R. (2003), Fluctuating Field Calculations for a Bimodal Medium, Journal of Applied Physics (Accessed February 25, 2024)
Created April 30, 2003, Updated October 12, 2021