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Magnetic bead detection using domain wall-based nanosensor.

Corte-Leon, H; Krzysteczko, P*; Schumacher, H W*; Manzin, A*; Cox, D; Antonov, V*; Kazakova, O (2015) Magnetic bead detection using domain wall-based nanosensor. J. Appl. Phys., 117 (17). 17E313

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Dynamics of domain walls (DWs) in L-shaped magnetic nanodevices have been proven to be reproducible and highly sensitive to external magnetic fields. Here we investigate the effect of a single magnetic bead (MB) on the DW pinning/depinning fields. DW propagation across the device is investigated using magnetoresistance measurements. DW pinning/depinning fields are characterized in as-prepared devices and after placement of a 1 µm-sized MB (Dynabeads® MyOne™) at the corner. The effect of the MB on the DW dynamics is seen as an increase in the depinning field for specific orientations of the device with respect to the external magnetic field. The shift of the depinning field, Bdep = 4.5 - 27.0 mT, is highly stable and reproducible, being significantly above the stochastic deviation which is about 0.5 mT. Its value is inversely proportional to the device width and the largest for the small negative angles between the device and the external magnetic field. Thus, we demonstrate that DW-based devices can be successfully used for detection of single micron size MB.

Item Type: Article
Subjects: Nanoscience
Nanoscience > Nano-Materials
Identification number/DOI: 10.1063/1.4914365
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6548

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