title: Current-driven spin dynamics of artificially constructed quantum magnets.
abstract: The future of nanoscale spin-based technologies hinges on a fundamental understanding and dynamic control of atomic-scale magnets. The role of the substrate conduction electrons on the dynamics of supported atomic magnets is still a question of interest lacking experimental insight. We characterized the temperature-dependent dynamical response of artificially constructed magnets, composed of a few exchange-coupled atomic spins adsorbed on a metallic substrate, to spin-polarized currents driven and read out by a magnetic scanning tunneling microscope tip. The dynamics, reflected by two-state spin noise, is quantified by a model that considers the interplay between quantum tunneling and sequential spin transitions driven by electron spin-flip processes and accounts for an observed spin-transfer torque effect.
authors.affiliation: Institute of Applied Physics, Hamburg University, Hamburg, Germany. akhajeto@physnet.uni-hamburg.de
authors.forename: Alexander Ako
authors.initials: AA
authors.lastname: Khajetoorians
authors.forename: Benjamin
authors.initials: B
authors.lastname: Baxevanis
authors.forename: Christoph
authors.initials: C
authors.lastname: Hübner
authors.forename: Tobias
authors.initials: T
authors.lastname: Schlenk
authors.forename: Stefan
authors.initials: S
authors.lastname: Krause
authors.forename: Tim Oliver
authors.initials: TO
authors.lastname: Wehling
authors.forename: Samir
authors.initials: S
authors.lastname: Lounis
authors.forename: Alexander
authors.initials: A
authors.lastname: Lichtenstein
authors.forename: Daniela
authors.initials: D
authors.lastname: Pfannkuche
authors.forename: Jens
authors.initials: J
authors.lastname: Wiebe
authors.forename: Roland
authors.initials: R
authors.lastname: Wiesendanger