Spin-Transfer Torque in Helical Spin Density Waves
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 10, 104433- p.Article in journal (Refereed) Published
The current driven magnetization dynamics of a helical spin-density wave is investigated. Expressions for calculating the spin-transfer torque of real systems from first-principles density-functional theory are presented. These expressions are used for calculating the spin-transfer torque for the spin spirals of Er and fcc Fe at two different lattice volumes. It is shown that the calculated torque induces a rigid rotation of the order parameter with respect to the spin spiral axis. The torque is found to depend on the wave vector of the spin spiral and the spin polarization of the Fermi surface states. The resulting dynamics of the spin spiral is also discussed.
Place, publisher, year, edition, pages
2009. Vol. 79, no 10, 104433- p.
density functional theory, electron spin polarisation, erbium, Fermi surface, ferromagnetic materials, iron, magnetisation, spin density waves
IdentifiersURN: urn:nbn:se:uu:diva-96084DOI: 10.1103/PhysRevB.79.104433ISI: 000264768600089OAI: oai:DiVA.org:uu-96084DiVA: diva2:170546