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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Small. 2018 Oct 4;14(44):e1802563. doi: 10.1002/smll.201802563

Figure 2. The static gating field is generated using three sets of NdFeB magnets and is superimposed on an alternating magnetic field.

Figure 2.

(a, b) The static gating field is generated using two sets of oppositely polarized NdFeB ring magnets and one set of NdFeB cylindrical magnets protected by magnetizable steel and acrylic. A water-cooled copper solenoid is used to generate the alternating magnetic field. (c) Image of device. Alternating current is passed through an amplifier and into the solenoid to generate the alternating magnetic field. The solenoid is wound from hollow copper tubing to allow for water cooling. (d) Magnetic field measurements confirm the presence of a sharp zero point at the center of the device. Overlay: magnetic field lines simulated in COMSOL.