Dynamics of AF nanoparticles

Dynamic rotor mode in antiferromagnetic nanoparticles.
K. Lefmann, H. Jacobsen, J. Garde, P. Hedegård, A. Wischnewski, S. N. Ancona, H. S. Jacobsen, C. R. H. Bahl, and L. Theil Kuhn
Phys. Rev. B 91, 094421 (2015)

Illustration of two magnetic modes in an antiferromagnetic nanoparticle with a vertical easy axis. The A (B) sublattice points in the +z(−z) direction and describes a blue (red) trajectory: (top) a uniform in-plane magnetic mode; the ωα mode; (bottom) the “rotor mode.”