Damping parameter and wall velocity of RE-TM films

The temperature dependence of the Gilbert damping parameter and domain wall velocity of ferrimagnetic rare earth-3d transition metal alloy (RE-TM) films are discussed. The Gilbert damping parameter is assumed to be inversely proportional to the net angular momentum of the RE-TM. Under this assumption, wall velocity is simulated. In the case of wall motion utilizing the temperature gradient of wall energy, the wall velocity reaches a maximum in the vicinity of the angular momentum compensation temperature of the RE-TM.