Cantilever-free magnetic resonance force microscope
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United States of America Patent
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Dec 28, 2004
Grant Date -
Mar 25, 2004
app pub date -
Apr 16, 2003
filing date -
Apr 17, 2002
priority date (Note) -
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Abstract
Magnetic resonance force microscopy (MRFM) is a technology capable of detecting the magnetic resonance of a small number of spins and, potentially, a single spin of an electron or nucleus. Most methods use soft cantilevers with microscopic dimensions (microns) which have been developed for atomic force microscopy. Cantilevers have been both a solution and problem of high sensitivity force detection. They are difficult to fabricate and it is difficult to achieve the right sensitivity and stiffness with them. The proposed invention eliminates the cantilever and replaces it with small, magnetically sensitive objects called birdies, which are manipulated above a sample using electromagnetic field control. The basic principles of the cantilever-free MRFM are the same as those of traditional, cantilever-based systems. Motion of the birdie induced by magnetic resonance is monitored using optical interferometry. The magnetic resonance force microscope should have application in both material and biological research at the nanoscale level.
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