Figure 3. Spin structures and : and are precession frequencies, and are precession angles, and are nutation angles, S is spin; r.l. is the reference line, is spin supercurrent

From

An Analogy Between the Properties of Light and Properties of Vortex-Wave Process in the Medium Similar to Superfluid 3Не-В

Liudmila B. Boldyreva

International Journal of Physics. 2015, 3(2), 74-83 doi:10.12691/ijp-3-2-5