Nanomechanical torsional resonator torque magnetometry (invited)

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Journal titleJournal of Applied Physics
Article number07D309
SubjectDual beam; First-order phase transitions; Ion systems; Landau theory; Lorentz microscopies; Magnetic elements; Magnetic torques; Micromechanical resonator; Nano scale; Silicon nitride membrane; Torque magnetometry; Torsional resonator; Transmission electron; Vortex nucleation; Magnetic hysteresis; Magnetometers; Nanostructured materials; Quantum optics; Resonators; Silicon nitride; Thick films; Vortex flow; Nanomagnetics
AbstractMicromechanical resonators are very useful for detection of magnetic torque. We have developed nanoscale torsional resonators fabricated within silicon nitride membranes, as a platform for magnetometry of nanoscale magnetic elements. We describe the rotational magnetic hysteresis of a 10 nm thick film deposited on a resonator, and a study of magnetic hysteresis in a single, 1 m diameter permalloy disk. The torsional resonator is patterned using a dual beam scanning electron/focused ion system. For the 1 m diameter disk, it is found to be possible to tune the conditions such that an apparent magnetic supercooling of vortex nucleation is observed, as would be suggested by the modified Landau theory of the C- to vortex-state switch as a first-order phase transition. Complementary transmission electron and Lorentz microscopy of the same structures have also been performed. © 2011 American Institute of Physics.
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AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21271987
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Record identifier908f0037-dbfd-43ec-b6af-f63508e3b9b2
Record created2014-05-16
Record modified2016-05-09
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