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Relative Vortex State Control in a Co/Cu/Co Pseudo-Spin-Valve Ring
Ahmet S. Demiray1,
Tetsuya Miyawaki1,
Yusuke Watanabe1,
Makoto Kohda1,2,
Kesami Saito3,
Seiji Mitani3,
Koki Takanashi3, and
Junsaku Nitta1
1Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
2PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 331-0012, Japan
3Institute of Materials Research, Tohoku University, Sendai 980-8523, Japan
(Received September 26, 2011; accepted December 26, 2011; published online April 20, 2012)
The magnetization reversal process of a Co/Cu/Co pseudo-spin-valve ring structure has been investigated by magneto-resistance measurements and micromagnetic simulations. Major-loop measurement reveals four distinct magnetic configurations between the top and bottom Co rings. We conducted minor-loop measurements with a fixed vortex configuration in the bottom Co ring while the magnetic state of the top Co ring was changed between the onion and vortex states. It was found that the parallel vortex between the top and bottom rings shows a stable magnetization state when the top Co ring is not fully saturated in the onion state, in which the local vortex remains at the ring edge. Micromagnetic simulations also confirm that the local vortex remaining in the top ring contributes to the control of the magnetic parallel vortex state.
URL:
http://jjap.jsap.jp/link?JJAP/51/04DM04/
DOI: 10.1143/JJAP.51.04DM04
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