Spin

Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator

Speaker(s): 
Chunhui Du
Dates: 
Friday, February 9, 2018 - 4:30pm to 5:30pm

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...

Spin Dynamics of Topological Spin Textures in Chiral Magnets

Speaker(s): 
Emrah Turgut
Dates: 
Thursday, January 25, 2018 - 4:30pm to 5:30pm

The chiral spin textures are a consequence of the anti-symmetric exchange interaction, which presents in the material systems with broken inversion symmetry, such as B20FeGe. This interaction enables chiral magnetic order, including topologically non-trivial magnetic skyrmions, which display rich new magnetic phenomena and require low critical current densities to manipulate.  This makes magnetic skyrmions a promising platform for power-efficient spintronics applications. Therefore, a deeper understanding of the static and dynamic magnetic properties of these materials...