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Add to Calendar 2/15/2018 11:00 am 2/16/2018 America/Chicago Special Condensed Matter Seminar: "Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator." DESCRIPTION:

In recent decades, a large scientific effort has focused on harnessing spin transport for providing insights into novel materials and low-dissipation information processing. We introduce single spin magnetometry based on nitrogen-vacancy (NV) centers in diamond as a new and generic platform to locally probe spin chemical potentials which essentially determine the flow of spin currents. We use this platform to investigate magnons in a magnetic insulator yttrium iron garnet (YIG) on a 100 nanometer length scale. We demonstrate that the local magnon chemical potential can be systematically controlled through both ferromagnetic resonance and electrical spin excitation, which agrees well with the theoretical analysis of the underlying multi-magnon processes. Our results open up new possibilities for nanoscale imaging and manipulation of spin-related phenomena in condensed-matter systems.

\n\nSPEAKER:

Chunhui Du, Harvard University

190 ESB

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Special Condensed Matter Seminar: "Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator."

Speaker Chunhui Du, Harvard University
Date: 2/15/2018 - 2/16/2018
Time: 11 a.m.
Location:

190 ESB

Event Contact: Marjorie Gamel
217-333-3762
mgamel@illinois.edu
Sponsor:

Department of Physics

Event Type: Seminar/Symposium
 

In recent decades, a large scientific effort has focused on harnessing spin transport for providing insights into novel materials and low-dissipation information processing. We introduce single spin magnetometry based on nitrogen-vacancy (NV) centers in diamond as a new and generic platform to locally probe spin chemical potentials which essentially determine the flow of spin currents. We use this platform to investigate magnons in a magnetic insulator yttrium iron garnet (YIG) on a 100 nanometer length scale. We demonstrate that the local magnon chemical potential can be systematically controlled through both ferromagnetic resonance and electrical spin excitation, which agrees well with the theoretical analysis of the underlying multi-magnon processes. Our results open up new possibilities for nanoscale imaging and manipulation of spin-related phenomena in condensed-matter systems.

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