Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.27: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Investigation of Magnetic Vortices in Cap Structures — •Dennis Nissen1, Senoy Thomas2, Sri Sai Phani Kanth3, and Manfred Albrecht1 — 1Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — 2Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology, 695015 Thiruvananthapuram, India — 3Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany
Vortex states, characterized by the circularity of the in-plane magnetization and the out-of-plane component of the vortex core, are of great fundamental importance and relevant for application. One approach to realize such magnetic vortex states is to manufacture large arrays of spherical SiO2-particle monolayers followed by film deposition of permalloy. In this way, it is possible to obtain magnetic cap structures on the particles forming vortex states[1].
We show the dependence of Py cap structures on the nucleation and annihilation field as function of the aspect ratio. Furthermore, we show how the magnetization reversal in exchange coupled IrMn/Fe caps with a diameter of 900 nm occurs. In this regard, the magnetic vortex at zero magnetic field vanishes as the temperature approaches the blocking temperature of IrMn accompanied by an increase in coercivity[2].
R. Streubel et al., Phys. Rev. B 85, 174429 (2012).
S. Thomas, D. Nissen, and M. Albrecht, Appl. Phys. Lett. 105, 022405 (2014).