Robert Stamps Colloquium

Fri. Jan. 26 12:30 PM - Fri. Jan. 26 01:20 PM
Location: TBA

Dr. Robert Stamps, FRSE FInstP FAPS

Professor and Head of the Department of Physics & Astronomy, University of Manitoba

Magnetics With A Twist

I will discuss unusual features associated with chiral interactions and geometries that lead to chiral ordering. The first example will be chirality and dynamics in materials of interest for their skyrmionic and helicoidal textures. I will then discuss experimental and theoretical results we have obtained for an emergent chiral effect in which a thermal sort of ‘rachet’ appears.  The underlying mechanism appears to be an example of unexpected finite size induced symmetry breaking in an artificially designed structure. Lastly, I will describe new predictions for spin wave emission based on a conservation law we have proposed for chiral dynamics.

  1. J.-V. Kim, R. L. Stamps, and R. E. Camley, ‘Spin wave power flow and caustics in ultrathin ferromagnets with the Dzyaloshinskii-Moriya interaction’, Phys. Rev. Lett. 117 (2016).
  2. A. O. Leonov et al., ‘Chiral Surface Twists and Skyrmion Stability in Nanolayers of Cubic Helimagnets’, Phys. Rev. Lett. 117 (2016).
  3. S. Gliga et al., ‘Emergent dynamic chirality in a thermally driven artificial spin ratchet’, Nature Materials, 16 (2017).
  4. I. Proskurin, et al., ‘Spin-Wave Chirality and Its Manifestations in Antiferromagnets’, Phys. Rev. Lett. 119 (2017).