Engineering a vector electromagnet for advanced microscopy.
The diamond quantum science and technology (DQST) group at ANU has designed a novel electromagnet suited for use in confocal microscopy. Its unique geometry allows for strong field strengths with arbitrary direction control encompassed in a small and compact design.
In particular, the magnet leaves the space above the sample plane completely clear. It has a central hole along the vertical axis, allowing for an objective lens to be placed close to the sample. These features make the electromagnet immediately compatible with combined confocal + AFM or similar scanning probe microscopes.
We have developed a second larger field strength version device, which will have important applications in magnetic resonance including nano-NMR and nuclear spin hyperpolarisation.
This electromagnet was invented out of necessity to support our nanoscale electrometry research but has utility across many groups and applications performing microscopy with spins or any microscopy that requires a well controlled magnetic field (e.g. MOKE, magnetic tweezers).