Tunable magnetic field source for magnetic field imaging microscopy

• URL: http://arxiv.org/abs/2112.15359v1
• Date: Fri, 31 Dec 2021 09:24:46 GMT
• Title: Tunable magnetic field source for magnetic field imaging microscopy
• Authors: Andris Berzins, Hugo Grube, Reinis Lazda, Marc A. Hannig, Janis Smits, Ilja Fescenko
• Abstract summary: The device is based on a pair of diametrically magnetized permanent magnet cylinders with electro-mechanical rotation control and ferrite field concentrators. A Hall probe and NV centers in diamond are used to demonstrate a proof of concept of a proposed magnetic field setup. A magnetic field source with a tunable field amplitude in the range from 1 mT to 222 mT is demonstrated.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this work we present a novel, compact, power efficient magnetic field source design for magnetic field imaging microscopy. The device is based on a pair of diametrically magnetized permanent magnet cylinders with electro-mechanical rotation control and ferrite field concentrators. A Hall probe and NV centers in diamond are used to demonstrate a proof of concept of a proposed magnetic field setup and to characterise the homogeneity of the produced magnetic field on a micrometer scale. Numerical simulation results are compared with experimental results showing good agreement of the distribution of the magnetic field in the setup. As a result, a magnetic field source with a tunable field amplitude in the range from 1 mT to 222 mT is demonstrated, achieving a magnetic field homogeneity of 2 ppm/$\mu$m or 0.5 $\mu$T/$\mu$m at 222 mT in a 25$\times$25 $\mu$m field of view.

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