Interaction of Domain Walls and Magnetic Nanoparticles in Giant Magnetoresistive Nanostrips for Biological Applications

    Authors

    T. Klein; J. Lee; W. Wang; T. Rahman; R. I. Vogel;J. P. Wang

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Magn.

    Keywords

    Biosensing; domain walls; giant magnetoresistence; magnetic; nanoparticles; nanostrip; pinning site; BIOSENSORS; Engineering, Electrical & Electronic; Physics, Applied

    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.

    Journal Title

    Ieee Transactions on Magnetics

    Volume

    49

    Issue/Number

    7

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    3414

    Last Page

    3417

    WOS Identifier

    WOS:000322483200087

    ISSN

    0018-9464

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