Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 43: Magnetic textures I

MA 43.6: Vortrag

Donnerstag, 15. März 2018, 11:00–11:15, EB 407

Experimental Investigation into the thermomagnetic Phase Diagram of Pd/Fe/Ir(111) — •Philipp Lindner, Lennart Bargsten, Johannes Friedlein, Jonas Harm, Stefan Krause, and Roland Wiesendanger — Department Physik, Universität Hamburg, Jungiusstraße 11A, 20355 Hamburg

First individual atomic scale skyrmions have been observed in the system of an atomic layer of Fe sandwiched between an Ir(111) surface and a Pd monolayer [1].

At low temperature (T < 8 K), the application of an external magnetic field results in phase transitions from the spin spiral (SS) ground state to the skyrmion (SK) state (B > 1 T) and finally into the ferromagnetic (FM) state (B > 2 T). For potential spintronics applications, the thermal stability of the SK state is of high relevance.

In our study we epitaxially grew Pd nanoislands on the Fe-monolayer on top of Ir(111) and investigated the sample system via scanning tunneling microscopy within our home-built ultra-high vacuum system, which allows the application of magnetic fields up to 3 T perpendicular to the (111) sample plane at the full temperature range of 1 K to 100 K.

We explored the thermomagnetic phase diagram and report the observation of the SK-FM transition even at T ≈ 80 K. Additionally, indications of a disordered magnetic state at elevated temperatures are compared to a possible fluctuation-disordered state as predicted by Monte-Carlo and spin dynamics simulations [2].

[1] N. Romming et al., Science 341, 713 (2013).

[2] L. Rózsa et al., Phys. Rev. B 93, 024417 (2016).