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Nanomechanical Torque Magnetometry and AC Susceptometry of Mesoscopic Magnetic Structures Open Access


Other title
Torque Magnetometry
AC Susceptometry
Type of item
Degree grantor
University of Alberta
Author or creator
Losby, Joseph E
Supervisor and department
Freeman, Mark R. (Physics)
Examining committee member and department
Meldrum, Al (Physics)
Klein, Olivier (Service de Physique de l’Etat Condense (CEA) and Ecole Polytechnique, France)
Beach, Kevin S. D. (Physics)
Kravchinsky, Vadim A. (Physics)
Brett, Michael J. (Electrical and Computer Engineering)
Department of Physics

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Nanomechanical torque magnetometry is emerging to become one of the most highly-sensitive methods for measuring magnetostatic interactions in mesoscopic magnetic materials. Here, advances in torque magnetometry are offered for the probing of new physics and extending the functionality of the devices to explore phenomena previously inaccessible using the technique. In early studies, fully magnetic cantilevers were fabricated and the magnetization switching along the length of the devices was mechanically characterized using a simple model to describe the cantilever deflection under the influence of a magnetic torque. Torsional magnetometers were later primarily investigated due to their high responsivity to a magnetic torque applied along the torsion rod axis. A method for the calibration of a torque magnetometer's displacement and magnetic moment sensitivity, through the detection of thermomechanical noise is offered. A vector-based nanomechanical transduction scheme was later developed to investigate the pristine internal three dimensional magnetization present in a micromachined yttrium iron garnet disk. Finally, a new method for the simultaneous detection of DC magnetization and low-frequency AC susceptibility was developed, bringing nanomechanical magnetometry toward the realm of magnetization dynamics.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
J. Losby, J.A.J. Burgess, C.M.B. Holt, J.N. Westwood, D. Mitlin, W.K. Hiebert, and M.R. Freeman, J. Appl. Phys. 108, 123910 (2010). Also in Virtual Journal of Nanoscale Science and Technology 23, (2011).J. Losby, J.A.J. Burgess, Z. Diao, D.C. Fortin, W.K. Hiebert, and M.R. Freeman, J. Appl. Phys. 111, 07D305 (2012).J. Losby, Z. Diao, F. Fani Sani, D.T. Grandmont, J.A.J. Burgess, W.K. Hiebert, and M.R. Freeman, Nanomechanical AC Susceptometry of an Individual Mesoscopic Ferrimagnet, (Accepted: Solid State Commun. SI: Spin Mechanics, 2013).

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File title: Nanomechanical Torque Magnetometry of Mesoscopic Structures, Ph. D. Thesis
File author: Joseph Edwin Losby
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