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(Color) (a) Scanning electron micrograph of the Cu microwire with integrated FeCo tip. (b) Representation of the experimental apparatus at the bottom of the cryostat (the relative scale of the components has been slightly altered). , the cantilever shaft, and the axis of the magnetic tip are aligned along . Current flows in the wire along , while at the position of the sample, the lever displacement and are directed along . (c) Schematic diagram of the electrical connections to the microwire.
(Color online) Power spectral density of cantilever displacement during adiabatic rapid passage of a statistical polarization of spins. The inset represents the frequency sweep of that induces the passages.
(Color online) (a) rf pulse protocol for the spin nutation experiment. The resulting power spectral density of cantilever displacement with pulse widths equivalent to (b) 0, (c) , and (d) radians of nutation. (e) The corresponding force signal is measured through a narrow band lock-in amplifier and plotted in points as a function of pulse width . A amplitude can be extracted from a decaying cosinusoidal fit of the Rabi oscillations shown in red.
(Color online) Plot of the as a function of in the sample at . Red line corresponds to the limit set on by the adiabatic condition and is calculated using numerical integration of the Bloch equations for repetitive linear frequency sweeps of through resonance (Ref. 13 ).
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