1201.5791 (Y. W. Windsor et al.)

Dynamics of Successive Minor Hysteresis Loops    [PDF]

Y. W. Windsor, A. Gerber, M. Karpovski

Cumulative growth of successive minor hysteresis loops in Co/Pd multilayers
with perpendicular anisotropy was studied in the context of time dependent
magnetization reversal dynamics. We show that in disordered ferromagnets, where
magnetization reversal involves nucleation, domains' expansion and
annihilation, differences between the time dependencies of these processes are
responsible for accumulation of nuclei for rapid domain expansion, for the
asymmetry of forward and backward magnetization reversals and for the
respective cumulative growth of hysteresis loops. Loops stop changing and
become macroscopically reproducible when populations of upward and downward
nucleation domains balance each other and the respective upward and downward
reversal times stabilize.

View original: http://arxiv.org/abs/1201.5791