Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 41: Magnetic Textures: Statics and Imaging II
MA 41.12: Vortrag
Donnerstag, 4. April 2019, 12:30–12:45, H37
Co/Pt/W and Co/Pt/Ir multilayers as host materials for potential Skyrmion devices — •Valentin Ahrens, Simon Mendisch, Martina Kiechle, Ádám Papp, and Markus Becherer — Technische Universität München(TUM), Chair of Nanoelectronics, Arcisstr. 21, 80333 Munich, Germany
Perpendicular magnetized, room temperature sputtered, Co/Pt/Ir and Co/Pt/W multilayers are investigated as a potential host for skyrmions. Basic investigations on the magnetic properties (Hc, Keff and IEC), of single and bilayer stacks were performedin order to promote a better understanding of those multilayer systems. These properties are assessed by means of magneto-optical Kerr effect(MOKE) measurements and Keff is fitted from anomalous hall effect (AHE) measurements. Furthermore the hysteretic behaviour of nanostructured films is investigated using a laser-MOKE. By means of FIB irradiation (Ga+), the anisotropy of the nanostructures is locally decreased to form artificial nucleation centers. This allows to explicitly tune the interlayer exchange coupling (IEC) from FM to AF by means of Ga+ radiation. This tunability is highly sensitive to the Ga+ ion dose. Different multilayer stacks are evaluated according to their ability to host skyrmions. To reach certain domain states the samples are demagnetized by a linearly decreasing oscillatory magnetic field. By application of field pulses of different length tpulse and strength Bpulse the domains are transformed into skyrmions. The skyrmion behaviour in 3D magnetic fields is investigated by means of MOKE and magnetic force microscopy (MFM) imaging.