Title

Interaction Of Domain Walls And Magnetic Nanoparticles In Giant Magnetoresistive Nanostrips For Biological Applications

Keywords

Biosensing; domain walls; giant magnetoresistence; magnetic nanoparticles; nanostrip; pinning site

Abstract

Head-to-head domain walls (DW) are formed and detected in U-shaped spin valve nanostrips by a Bitter Method on scanning electron microscope. We find that optimization of the washing technique is critical to proper deposition of magnetic nanoparticles (MNPs). The DW position is monitored electrically with giant magnetoresistance (GMR) similar to a potentiometer. DWs are repeatedly pinned and depinned from a site near the device center using a stage with two axis field. We first confirm the distribution of depinning events from a random sample of devices and obtain a standard deviation of 2.2 Oe. We then obtain an experimental signal of 8 Oe shift in depinning field from just 7 MNPs of 35 nm diameter. © 2013 IEEE.

Publication Date

8-2-2013

Publication Title

IEEE Transactions on Magnetics

Volume

49

Issue

7

Number of Pages

3414-3417

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TMAG.2013.2250935

Socpus ID

84880773766 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84880773766

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