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Magnetic Properties of Perpendicularly Magnetized [Co/Pd]/Au/[Co/Pd] Pseudo-Spin-Valve Nano-Ring Structures

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3 Author(s)
Liu, X.M. ; Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore ; Jain, S. ; Adeyeye, A.O.

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.

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Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 10 )