Control and local measurement of the spin chemical potential in a magnetic insulator
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Ross_Control and local.pdf
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3.26 MB
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Checksum (MD5)
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Author(s)
Du, Chunhui
van der Sar, Toeno
Zhou, Tony X.
Upadhyaya, Pramey
Casola, Francesco
Zhang, Huiliang
Walsworth, Ronald L.
Tserkovnyak, Yaroslav
Yacoby, Amir
Onbasli, Mehmet Cengiz
Ross, Caroline A
Date Issued
July 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Du, Chunhui et al. “Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator.” Science 357, 6347 (July 2017): 195–198. © The Authors, some rights reserved
Version
Original manuscript
Abstract
The spin chemical potential characterizes the tendency of spins to diffuse. Probing this quantity could provide insight into materials such as magnetic insulators and spin liquids and aid optimization of spintronic devices. Here we introduce single-spin magnetometry as a generic platform for nonperturbative, nanoscale characterization of spin chemical potentials. We experimentally realize this platform using diamond nitrogen-vacancy centers and use it to investigate magnons in a magnetic insulator, finding that the magnon chemical potential can be controlled by driving the system’s ferromagnetic resonance. We introduce a symmetry-based two-fluid theory describing the underlying magnon processes, measure the local thermomagnonic torque, and illustrate the detection sensitivity using electrically controlled spin injection. Our results pave the way for nanoscale control and imaging of spin transport in mesoscopic systems.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1126/science.aak9611
