Vertical stack of Co nanorings with current-perpendicular-to-plane giant magnetoresistance: Experiment and micromagnetic simulation

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T. Yang,¹ A. Hirohata,¹ L. Vila,² T. Kimura,^1,2 and Y. Otani^1,2
¹Frontier Research System, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
²Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-858, Japan

Received 1 June 2007; revised 7 August 2007; published 8 November 2007

Verticalstacks of two Co rings with deep submicron lateral sizesand different thicknesses are fabricated and studied. The experimental resultssuggest the existence of a metastable domain wall structure revealedby the micromagnetics simulation. The technologically important vortex-vortex switching isfound dominated by the annular Oersted field of perpendicularly injecteddc, but also significantly affected by the spin-transfer torque. Theefficiency of the spin-transfer torque and the switching process arediscussed.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.172401
DOI:	10.1103/PhysRevB.76.172401
PACS:	75.75.+a; 75.47.De; 72.25.Ba; 85.75.Bb 75.75.+a Magnetic properties of nanostructures 75.47.De Giant magnetoresistance 72.25.Ba Spin polarized transport in metals 85.75.Bb Magnetic memory using giant magnetoresistance YEAR: 2007
KEYWORDS:	cobalt, giant magnetoresistance, magnetic domain walls, micromagnetics, nanostructured materials, nanotechnology

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