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Control of vortex state in cobalt nanorings with domain wall pinning centers

Lal, Manohar and Sakshath, S and Parakkat, Vineeth Mohanan and Kumar, P S Anil (2018) Control of vortex state in cobalt nanorings with domain wall pinning centers. In: AIP ADVANCES, 8 (5).

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Official URL: https://dx.doi.org/ 10.1063/1.5007239


Magnetic rings at the mesoscopic scale exhibit new spin configuration states and switching behavior, which can be controlled via geometrical structure, material composition and applied field. Vortex states in magnetic nanorings ensure flux closure, which is necessary for low stray fields in high packing density in memory devices. We performed magnetoresistance measurements on cobalt nanoring devices and show that by attaching nanowires to the ring, the vortex state can be stabilized. When a square pad is attached to the free end of the wire, the domain wall nucleation field in the nanowire is reduced. In addition, the vortex state persists over a larger range of magnetic fields, and exists at all in-plane orientations of the magnetic field. These experimental findings are well supported by our micromagnetic simulations. (C) 2017 Author(s).

Item Type: Journal Article
Additional Information: Copyright of this article belong to AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 17 Jul 2018 15:27
Last Modified: 17 Jul 2018 15:27
URI: http://eprints.iisc.ac.in/id/eprint/60202

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