Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.17: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Ferromagnetic resonance and anomalous Nernst effect in an individual magnetic nanotube with GaAs core — •Johannes Mendil1, Daniel Rüffer2, Florian Heimbach1, Florian Brandl1, Tobias Stückler1, Eleonora Russo-Averchi2, Anna Fontcuberta i Morral2, and Dirk Grundler1,3 — 1Physik Department E10, TU München, Garching, Germany — 2LMSC, EPFL, Lausanne, Switzerland — 3STI, EPFL, Lausanne, Switzerland
Nanomagnetism and magnetic domain walls play a key role in new visionary concepts, such as the racetrack memory [1]. We present a comprehensive study on ferromagnetic nanotubes (NTs) that allow to study vortex wall formation while avoiding the Bloch point structure existing in magnetic nanowires [2]. For this, a few 10 nm thick ferromagnetic shell (CoFeB or Ni) was deposited on a 10-to-20-µm-long GaAs nanowire. Anisotropic magnetoresistance data show well distinguishable signatures of magnetization switching. Under local laser heating we observe spike-like voltages that we attribute to the anomalous Nernst effect and an NT segment with an azimuthal magnetization. Following this, the chirality of a vortex state can be reconstructed during reversal. Additionally, electrically detected ferromagnetic resonance experiments reveal a series of spin-wave resonances. We will compare our results on individual CoFeB NTs to recently considered Ni NTs [3,4]. The work was supported by GR1640/5-1 in SPP 1538.
[1] S.S.P. Parkin et al., Science 320, 190 (2008); [2] R. Hertel et al., J. Magn. Mater. 278, L291 (2004); [3] D. Rüffer et al., Nanoscale 4, 4989 (2012); [4] A. Buchter et al., Phys. Rev. Lett. 111, 067202 (2013)