Piezoelectric microresonators for sensitive spin detection
arxiv(2024)
Abstract
Piezoelectric microresonators are indispensable in wireless communications,
and underpin radio frequency filtering in mobile phones. These devices are
usually analyzed in the quasi-(electro)static regime with the magnetic field
effectively ignored. On the other hand, at GHz frequencies and especially in
piezoelectric devices exploiting strong dimensional confinement of acoustic
fields, the surface magnetic fields (B_1) can be significant. This B_1
field, which oscillates at GHz frequencies, but is confined to μm-scale
wavelengths provides a natural route to efficiently interface with nanoscale
spin systems. We show through scaling arguments that B_1∝f^2 for
tightly focused acoustic fields at a given operation frequency f. We
demonstrate the existence of these surface magnetic fields in a
proof-of-principle experiment by showing excess power absorption at the focus
of a surface acoustic wave (SAW), when a polished Yttrium-Iron-Garnet (YIG)
sphere is positioned in the evanescent field, and the magnon resonance is tuned
across the SAW transmission. Finally, we outline the prospects for sensitive
spin detection using small mode volume piezoelectric microresonators, including
the feasibility of electrical detection of single spins at cryogenic
temperatures.
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