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Summary: Field orientation dependent vortex formation in individual multilayer
triangular rings
S. Jain and A. O. Adeyeyea
Department of Electrical and Computer Engineering, Information Storage Materials Laboratory,
National University of Singapore, Singapore 117576, Singapore
Received 26 December 2008; accepted 25 January 2009; published online 12 February 2009
We present the giant magnetoresistance responses of individual pseudo-spin-valve triangular ring
using synchronous transport measurement technique. We observed that unlike single layer triangular
rings, the formation of intermediate vortex state is strongly dependent on the applied field
orientation . For n /6 n+1 /6, n=0,1,2..., the Co layer in the ring undergoes a
transition from forward onion state to reverse onion state via an intermediate vortex state, otherwise
there is a direct transition from forward onion state to reverse onion states. This phenomenon in
triangular rings may be useful for applications in future spin logic devices. © 2009 American
Institute of Physics. DOI: 10.1063/1.3081419
Lithographically defined magnetic nanorings have be-
come the focus of intense research, since they were proposed
as potential candidates for high density storage magnetic ran-
dom access memories.1
Their intrinsic property of forming a
flux-closure vortex state makes them highly insensitive to
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