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Sensing Spin Precession with Free Electrons
Antonín Jaroš1, Michael S Seifner1, Johann Toyfl1
1Vienna Center for Quantum Science and Technology, Atominstitut, USTEM, Technische Universität Wien, Stadionallee 2, Vienna 1020, Austria.
None:
We present a method that combines spin resonance spectroscopy with transmission electron microscopy (TEM), enabling localized in situ detection of microwave (MW)-driven spin transitions in the specimen, utilizing the free-space electron beam of the TEM as a signal receiver. Spin state polarization is achieved via the magnetic field of the TEM's polepiece, while a custom-designed microresonator integrated into a TEM sample holder delivers continuous wave MW excitation at GHz frequencies. At resonance, the MW field drives spin transitions that produce a dynamic, precessional magnetic field around the specimen, inducing a deflection of the free-space electron beam. Phase-locked detection synchronized to the MW driving fields enables the isolation of spin precession contributions to the electron beam deflection. The presented technique offers a pathway for the in situ exploration of spin excitations at the nanoscale.
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