Magnetic bead detection using domain wall-based nanosensor

H. Corte-León, P. Krzysteczko, H. W. Schumacher, A. Manzin, D. Cox, V. Antonov, O. Kazakova

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We investigate the effect of a single magnetic bead (MB) on the domain wall (DW) pinning/depinning fields of a DW trapped at the corner of an L-shaped magnetic nanodevice. 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, ΔBdep = 4.5-27.0 mT, is highly stable and reproducible, being significantly above the stochastic deviation which is about 0.5 mT. The shift in the deppinning field is inversely proportional to the device width and larger for 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.

Original languageEnglish
Article number17E313
JournalJournal of Applied Physics
Volume117
Issue number17
DOIs
Publication statusPublished - 7 May 2015
Externally publishedYes

Fingerprint

Dive into the research topics of 'Magnetic bead detection using domain wall-based nanosensor'. Together they form a unique fingerprint.

Cite this