Title :
Magnetic Properties of Perpendicularly Magnetized [Co/Pd]/Au/[Co/Pd] Pseudo-Spin-Valve Nano-Ring Structures
Author :
Liu, X.M. ; Jain, Sonal ; Adeyeye, A.O.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
We systematically investigate the effects of interlayer, inter-ring dipolar coupling and the number of bilayer repeats on the magnetization reversal process of [Co/Pd]/Au(t)/[Co/Pd] pseudo-spin-valve (PSV) nano-rings. We observed that exchange coupling dominates the magnetization reversal process in PSV rings when the Au spacer layer thickness is 1 nm, while magnetostatic coupling plays a more significant role for thicker spacer layer. The magnetization reversal process of the PSV nano-rings as a function of inter-ring spacing provides a way to engineer the switching fields in both the ferromagnetic layers. We observed that the coercivity of both the top and bottom Co/Pd stack increases with increasing inter-ring spacing.
Keywords :
cobalt; coercive force; exchange interactions (electron); ferromagnetic materials; gold; magnetic switching; magnetisation reversal; nanostructured materials; palladium; spin valves; Co-Pd-Au-Co-Pd; coercivity; exchange coupling; ferromagnetic layers; inter-ring dipolar coupling; inter-ring spacing; interlayer effects; magnetic properties; magnetization reversal processing; magnetostatic coupling; pseudospinvalve nanoring structures; size 1 nm; spacer layer; switching fields; Couplings; Gold; Magnetic hysteresis; Magnetic multilayers; Magnetic switching; Magnetostatics; Switches; Co/Pd multilayer; ferromagnetic nanoring; interlayer coupling; magnetization reversal; perpendicular anisotropy; pseudo-spin-valve;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2155634
