Recent Advances in Mechanical Torque Studies of Small-scale Magnetism

Abstract

There is a storied scientific history in the role of mechanical instruments for the measurement of fundamental physical interactions. Among these include the detection of magnetic torques via a displacement of a compliant mechanical sensor as a result of angular momentum transfer. Modern nanofabrication methods have enabled the coupling of mechanical structures to single, miniature magnetic specimens. This has allowed for strikingly sensitive detection of magnetic hysteresis and other quasi-static effects, as well as spin resonances, in materials confined to nanoscale geometries. The extraordinary sensitivities achieved in mechanical transduction through recent breakthroughs in cavity optomechanics, where a high-finesse optical cavity is used for readout of motion, are now being harnessed for torque magnetometry. In this article, we review the recent progress in mechanical detection of magnetic torques, highlight current applications, and speculate on possible future developments in the technology and science. Guidelines for designing and implementing the measurements are also included.

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Cited by in corpus (8)

• Ultrasensitive torque detection with an optically levitated nanorotor
• Diamond Integrated Quantum Photonics: A Review
• Observation of radiation torque shot noise on an optically levitated nanodumbbell
• The Einstein - de Haas effect at radio frequencies in and near magnetic equilibrium
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• A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk
• Mechanical rotation via optical pumping of paramagnetic impurities
• Photonic crystal cavities based on suspended yttrium iron garnet nanobeams