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Início
Agenda |
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- 18 de novembro de 2015
16h30
F-210 -
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Prof. Michael Flatté
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Dept. of Physics and
Astronomy - University of Iowa
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Atomic-scale
magnetometry of dynamic magnetization
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The spatial resolution of imaging magnetometers
has benefitted from scanning probe techniques. The requirement
that the sample perturbs the scanning probe through a magnetic
field external to its volume limits magnetometry to samples with
static moments. We propose a magnetometer in which the
perturbation is reversed; the probe's magnetic field generates a
response of the sample, which acts back on the probe and changes
its energy. For an NV$^-$~spin center in diamond this
perturbation changes the fine structure splitting of the spin
ground state. Sensitive measurement techniques using coherent
detection schemes then permit detection of the magnetic response
of paramagnetic and diamagnetic materials, including especially
superconductors. This technique can measure the thickness of
magnetically dead layers with better than 0.01 nm accuracy. -
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