Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.31: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Thickness dependence of compensation temperature in GdCoFeB ferrimagnets — •Fabian Kammerbauer1, Nico Kerber1, and Boris Seng1,2 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany. — 2University of Lorraine, 54506 Vandoeuvre-lès-Nancy, France.
Magnetic skyrmions are topologically protected spin textures particularly suitable for next generation spintronics devices, like the skyrmion-based racetrack memory. Recent studies confirmed the current-driven skyrmion dynamics in ultrathin ferromagnets[1]. However, the topological Magnus effect leads to a transverse motion of ferromagnetic skyrmions due to their non-zero topological charge[1]. Antiferromagnetically exchange-coupled skyrmions or compensated ferrimagnets could suppress this effect owing to an overall zero topological charge. Especially at the angular momentum compensation temperature skyrmions dynamics is predicted to be collinear with the current[2].
We report here on a decrease in compensation temperature in the thin film ferrimagnetic system [Pt(5 nm)/GdCoFeB(d)/MgO(1.2 nm)/Ta(2 nm)] for increasing thickness d of the GdCoFeB alloy observed in multiple alloy compositions. Although this limits the accessible range of structures near compensation, it also allows for tuning the compensation through an additional parameter.
[1] K. Litzius et al., Nature Phys. 13, 170 (2017)
[2] Barker et al. Phys. Rev. Lett. 116, 147203 (2016)