Achieving High Sensitivity in Cavity Optomechanical Magnetometry
Technical Report,01 Dec 2012,30 Nov 2015
The University of Queensland Brisbane Australia
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Magnetometers are important for diverse applications such as geological surveys, material science, medical imaging, and defence 1. For many of these applications sensitivity is a key metric. The current state-of-the- art in ultra-sensitive magnetometry is provided by Superconducting Quantum Interference Devices SQUIDs and Spin Exchange Relaxation Free magnetometers SERFs, which enable detection of pico- to fem-to tesla magnetic fields. However, technical limitations constrain the breadth of applications. SQUIDs require a cryogenic environment, increasing complexity, cost, size, and power consumption. SERFs typically have sub-kHz bandwidth, are difficult to integrate, and require magnetic shielding due to their low dynamic range 2, 3. By contrast, magnetostrictive magnetometers suffer none of these drawbacks, but typically have two to five orders of magnitude worse sensitivity.
- Magnetic and Electric Field Detection and Detectors