Exploring a novel cantilever design for enhanced sensitivity in magnetic resonance force microscopy

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Exploring a novel cantilever design for enhanced sensitivity in magnetic resonance force microscopy

Type: Master thesis
Title: Exploring a novel cantilever design for enhanced sensitivity in magnetic resonance force microscopy
Author: Donkersloot, Rembrandt
Issue Date: 2016-09-30
Keywords: magnetometry, cantilever, magnetic resonance, nanomagnet, magnetic resonance force microscopy
Abstract: We have investigated the technical feasibility of a novel concept within the scientific field of magnetic resonance force microscopy (MRFM), in which a cantilever is used as a force sensor on the one hand and a radio frequency (rf) source on the other. By driving a magnet-tipped cantilever at a higher resonance mode, the rotational motion of the magnetic tip generates an oscillating magnetic field. In this way the cantilever can serve as an ultra-low dissipative rf source with an rf frequency corresponding to the specific higher mechanical resonance mode of the cantilever. In this work we have tested this idea for an attonewton-sensitivity silicon cantilever with a high magnetic gradient cobalt nanomagnet attached at the cantilever's free end. Using frequency-shift cantilever magnetometry, we found that the nanomagnet's remanent magnetisation is 0.83 tesla. When the nanomagnet is close enough to a spin-containing sample, we have calculated that the nanomagnet's magnetisation - even at zero applied magnetic field - can mechanically generate an rf field of the order millitesla. This implies that the protocol for adiabatic rapid passage can be conducted without the use of an rf wire as a radio frequency source, which eliminates a major dissipation channel that constitutes an obstacle to date for lower working temperatures in high resolution 3D-imaging experiments with MRFM.
Supervisor: Marohn, John
Faculty: Faculty of Science
Department: Physics (Master)
Specialisation: Quantum matter and optics
ECTS Credits: 3
Handle: http://hdl.handle.net/1887/43973
 

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