Reversal mechanisms in perpendicular magnetic nanostructures
Justin M. Shaw, Stephen E. Russek, Michael J. Donahue, Thomas Thomson, Bruce Terris, Michael Schneider, Miles Olsen
We find that the reversal mechanism in magnetic nanostructures is highly dependent on the nature and condition of the edges. Temperature and size dependent reversal properties of fabricated perpendicularly magnetized nanostructures down to 25 nm in diameter with two distinct edge conditions were experimentally studied and modeled. We find that the reversal mechanism can be either a Stoner-Wohlfarth (S-W) center nucleation process or an edge nucleation process that does not strictly conform to the S-W model. Micromagnetic simulations reproduce the observed change in reversal mechanism.
Physical Review B (Condensed Matter and Materials Physics)