Details

Autor(en) / Beteiligte

• Yamane, Yuta
• Ieda, Jun'ichi
• Sinova, Jairo

Titel

Spin-transfer torques in antiferromagnetic textures: Efficiency and quantification method

Ist Teil von

• Physical review. B, 2016-08, Vol.94 (5), Article 054409

Erscheinungsjahr

2016

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• We formulate a theory of spin-transfer torques in textured antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the intersublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer torques in antiferromagnets in terms of well-defined material parameters, revealing that the charge current couples predominantly to the antiferromagnetic order parameter and the sublattice-canting moment in, respectively, the limits of large and small exchange coupling. The effects can be quantified by analyzing the antiferromagnetic spin-wave dispersions in the presence of charge current: in the limit of large exchange coupling the spin-wave Doppler shift always occurs, whereas, in the opposite limit, the only spin-wave modes to react to the charge current are ones that carry a pronounced sublattice-canting moment. The findings offer a framework for understanding and designing spin-transfer torques in antiferromagnets belonging to different classes of sublattice structures such as, e.g., bipartite and layered antiferromagnets.