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. 2015 Mar 23;5(1):98–117. doi: 10.3390/bios5010098

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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(a) Integration of magnet with funnel chip with a cylindrical neodymium magnet attached to a needle placed horizontally beneath the funnel chip (horizontal-needle-magnet). (b) Integration of funnel chip with stacked cylindrical magnet with different arrangements of a needle tip and another magnet on the top. The local magnetic field for a number of configurations was simulated with a Finite Element Package (COMSOL^® 3.5). (c) Geometric model of the Nickel-coated needle and Neodymium magnets. The 2D magnetic field intensity distribution in the plane of the nanoslit is shown. (d) Magnetic field distribution for the needle and magnet configuration in the various configurations of horizontal-needle-magnet (dotted line), vertical-magnet (dashed-dotted line), sandwich-magnet (dashed line) and sandwich-magnet-with-a-tip (solid line) are shown.