A permalloy nanowire concentrates and suppresses GHz microwave fields in sub-300 nm regions, mapped via NV Rabi oscillations, with a directly measured ~2.35x field enhancement at 84 nm and an extrapolated 4x at the surface.
Off-Resonant Manipulation of Spins in Diamond via Precessing Magnetization of a Proximal Ferromagnet
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abstract
We report the manipulation of nitrogen vacancy (NV) spins in diamond when nearby ferrimagnetic insulator, yttrium iron garnet, is driven into precession. The change in NV spin polarization, as measured by changes in photoluminescence, is comparable in magnitude to that from conventional optically detected magnetic resonance, but relies on a distinct mechanism as it occurs at a microwave frequency far removed from the magnetic resonance frequency of the NV spin. This observation presents a new approach to transferring ferromagnetic spin information into a paramagnet and then transducing the response into a robust optical signal. It also opens new avenues for studying ferromagnetism and spin transport at the nanoscale.
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Flux channeling induced nano-confinement and enhancement of microwaves imaged by Rabi oscillation mapping
A permalloy nanowire concentrates and suppresses GHz microwave fields in sub-300 nm regions, mapped via NV Rabi oscillations, with a directly measured ~2.35x field enhancement at 84 nm and an extrapolated 4x at the surface.