Magnonic momentum transfer force on domain walls confined in space
1 Department of Physics, National University of Defense Technology - Changsha 410073, Hunan, PRC
2 School of Physics Science and Technology, Central South University - Changsha 410083, Hunan, PRC
Received: 1 November 2012
Accepted: 10 January 2013
Momentum transfer from incoming magnons to a Bloch domain wall is calculated using one-dimensional continuum micromagnetic analysis. Due to the confinement of the wall in space, the dispersion relation of magnons is different from that of a single domain. This mismatch of dispersion relations can result in reflection of magnons upon incidence on the domain wall, whose direct consequence is a transfer of momentum between magnons and the domain wall. The corresponding counteraction force exerted on the wall can be used for the control of domain wall motion through magnonic linear-momentum transfer, in analogy with the spin transfer torque induced by magnonic angular-momentum transfer.
PACS: 75.60.Ch – Domain walls and domain structure / 75.30.Ds – Spin waves
© EPLA, 2013