Wren, T*; Kazakova, O (2015) Anisotropic magnetoresistance effect in sub-micron nickel disks. J. Appl. Phys., 117 (17). 17E134

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Abstract

The hysteretic transport properties of vortex states in submicron nickel disks are measured using the anisotropic magnetoresistance effect (AMR) and correlated with the magnetization state of the disks using in situ Magnetic Force Microscopy (MFM) measurements and micromagnetic modelling. The magnetoresistance behavior is described by a simple AMR model; however, the nucleation and annihilation fields of the vortex state differ when the magnetic field is applied parallel (0º) or perpendicular (90º) to the applied current within the sample plane. In the 0¿ orientation, the vortex magnetoresistance behaves similar to that reported in the literature. However, in the 90º orientation, the vortex nucleates and annihilates at lower applied fields than in the 0º orientation. Moreover, in the latter orientation the annihilation process occurs in a two-step transition. This difference is attributed to the effect of the inhomogeneous current distribution within the magnetic disk.

Item Type:	Article
Subjects:	Nanoscience Nanoscience > Nano-Materials
Identification number/DOI:	10.1063/1.4918967
Last Modified:	02 Feb 2018 13:13
URI:	https://eprintspublications.npl.co.uk/id/eprint/6678