Spin pumping torque in antiferromagnets
Abstract
A currentless, magnetic-field free mechanism for the Néel vector rotation in an antiferromagnet is proposed. An efficient torque is induced by spin pumping through charging/discharging of spin filtered electrons via a ferromagnetic layer in a spin capacitor structure consisting of the two heterogenous magnetic materials. The relatively long electron spin relaxation time in the antiferromagnet enables the electron spin polarizations to retain the exchange effective field sufficiently long to modulate the local magnetic moments and subsequently the magnetic state of the material. Precession of the sublattice magnetization is modeled based on the Néel vector formulation, theoretically demonstrating the feasibility of the physical mechanism (such as the reversal) with sub-aJ energy consumption. Its potential application to spintronic devices is also discussed.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 08, 2017
- Source ID
- 10.1063/1.4983196
Entities
People
- K. W. Kim
- Yuriy G. Semenov
Organizations
- Army Research Office
- North Carolina State University
- Semiconductor Research Corporation