Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 9: Spin Excitations/Spin Torque
MA 9.8: Vortrag
Montag, 16. März 2015, 17:30–17:45, H 0112
Lifetime of high-energy magnons in ultrathin FePd(001) films — •Huajun Qin1, Khalil Zakeri Lori1, Arthur Ernst1,2, Leonid M. Sandratskii1, Pawel Buczek1, Alberto Marmodoro1, Tzu-Hung Chuang1, Yu Zhang1, and Jürgen Kirschner1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Wilhelm Ostwald Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig, Germany — 3Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
The lifetime of high-energy magnons in itinerant ferromagnets
is very short due to their decay into the single-particle Stoner
excitations. This damping mechanism is commonly referred to as Landau damping.
We present the results of our investigations of magnons’ lifetime
in ultrathin FePd(001) alloy films grown on Pd(001), obtained by means
of spin polarized electron energy loss spectroscopy.
It is observed that the magnons’ lifetime in ultrathin FePd alloy films
is rather long compared to the one in Fe films grown on other
substrates [1]. First-principles calculations revealed that the long
magnons’ lifetime has its origin in the peculiar electronic
hybridizations between Fe and Pd atoms. These electronic
hybridizations lead to the suppression of the relaxation channels
of high-energy magnons and result in a long magnons’ lifetime.
We anticipate that the long lifetime of magnons in FePd films
makes them as good candidates for terahertz magnonics.
[1] Y. Zhang, T.-H. Chuang, Kh. Zakeri, and J. Kirschner, PRL 109, 087203 (2012).