Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
ORAL
Abstract
Control and manipulation of pure spin currents in magnetic insulators has been a central focus of modern spintronic research. Building on the transformative nitrogen vacancy (NV) based quantum sensing platform, we have achieved local detection of a range of spin wave modes in magnetic insulator Y3Fe5O12 thin films over a 100-nanometer length scale. Through the multi-magnon scattering process, the excited spin waves generate fluctuating magnetic fields at the NV electron spin resonance frequencies, accelerating the relaxation of the NV spin. By measuring the variation of the emitted photoluminescence of the NV center, the detailed information of the magnon modes can be optically accessed, providing a unique window to reveal the local magnetic properties of the studied materials. Our findings highlight the significant opportunities offered by NV spin quantum sensors in exploring nanoscale spin dynamics of emergent spintronic systems.
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Presenters
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Chunhui Du
University of California, San Diego
Authors
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Eric Lee-Wong
University of California, San Diego
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Ruolan Xue
Harvard University
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Feiyang Ye
University of California, San Diego
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Andreas Kreisel
Institute for Theoretical Physics, University of Leipzig, Universität Leipzig, University of Leipzig, Institut für Theoretische Physik, Universität
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Toeno van der Sar
Delft University of Technology
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Amir Yacoby
Harvard University, Department of Physics, Harvard University, Physics, Harvard University, Department of Physics, Harvard University, Cambridge, MA, 02138, USA
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Chunhui Du
University of California, San Diego