Macquarie University
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Brownian motion of magnetically levitated microsystems in vacuum

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posted on 2022-03-28, 14:29 authored by Stephen Dunn
This project aims to study the Brownian motion of a diamond micro-particle in a harmonic trap at pressures as low as 1×10−6 Torr. A novel, purely magnetic trap was designed with three dimensional magnetic modelling, optimising its shape to produce the highest resonant trapping frequencies. Experimental power spectral densities and mean square displacements match the theory very well, clearly showing observation of Brownian motion at low pressure. An attempt is also made to test the energy equipartition theorem at low pressure. There is potential for this trap configuration to be used to as a platform on which a macroscopic quantum superposition of states can be created and maintained oneday. There is also more immediate potential of the miniaturisation and integration of this trap system into electronics as a precision inertial sensor.


Table of Contents

1. Introduction -- 2. Modelling -- 3. Experimental -- 4. Results -- 5. Conclusion.


Theoretical thesis. Bibliography: pages 63-64

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Physics and Astronomy

Department, Centre or School

Department of Physics and Astronomy

Year of Award


Principal Supervisor

James Downes


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1 online resource (64 pages)

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