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Manipulating spins by cantilever synchronized frequency modulation: A variable resolution magnetic resonance force microscope
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10.1063/1.2955826
/content/aip/journal/apl/93/1/10.1063/1.2955826
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/1/10.1063/1.2955826
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of the MRFM setup. (b) Timing diagram of the CASMO protocol. The microwave frequency is modulated in phase with oscillation of cantilever. Following turn on of the microwave power at an extremum of the cantilever displacement, the spin magnetization is reversed periodically by adiabatic fast passage. The resulting spin force on the cantilever modifies its apparent compliance and hence its frequency; this constitutes the MRFM signal.

Image of FIG. 2.
FIG. 2.

Dependence of the MRFM signal on the phase of the microwave frequency modulation relative to the cantilever position. The MRFM signal varies periodically with phase because only the component of the force in phase with the oscillating cantilever’s position contributes to the signal.

Image of FIG. 3.
FIG. 3.

Evolution of spectra with increasing field gradient: all panels show the variation of the MRFM signal with external field. (a) At a probe-sample separation , , so the spectral width is dominated by the frequency modulation. (b) Decreasing increases and hence broadens the spectra at large . Inset: red crosses show the measured probe fields determined from the MRFM signals, while the solid line is the calculated field and gradient from a uniformly magnetized spherical magnet in diameter. (c) For , dominates the width . The two peaks near are the ZPFR signals arising from remote regions of the sample experiencing very small probe field.

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/content/aip/journal/apl/93/1/10.1063/1.2955826
2008-07-11
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Manipulating spins by cantilever synchronized frequency modulation: A variable resolution magnetic resonance force microscope
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/1/10.1063/1.2955826
10.1063/1.2955826
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