DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2019 – wissenschaftliches Programm

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

MA: Fachverband Magnetismus

MA 41: Magnetic Textures: Statics and Imaging II

MA 41.8: Vortrag

Donnerstag, 4. April 2019, 11:30–11:45, H37

Skyrmion meets magnetic tunnel junction: an efficient way for electrical skyrmion detection investigated by ab initio theory — •Jonas F. Schäfer, Philipp Risius, Michael Czerner, and Christian Heiliger — Institut für Theoretische Physik, JLU Giessen

Building devices based on skyrmions requires a sufficiently sensitive detection method. The most straightforward way would be a device based on tunnel magnetoresistance, where a second magnetic electrode has to be used. However this approach is not practical since the magnetic counter electrode is most likely going to interfere with the skyrmion. This issue can be overcome by nonmagnetic counterelectrodes, which detect skyrmions from their non-collinear magnetization. Up to now, skyrmion induced non-collinear effects on transport were only investigated for STM tips based on the Tersoff and Hamann model, reaching about 20% for specific energies. In our work we examine the effects of skyrmions on electronic transport in Cu/Fe/MgO/Cu, Cu/Fe/MgO/V and V/Fe/MgO/Cu tunnel junctions, incorporating the influence of the barrier and the non-magnetic reference electrode material. Using our KKR based NEGF code, we show that non-collinear effects on transport strongly depend on the material of the leads, beyond energy dependent variations in the density of states. While for the copper electrodes only a variation in conductivity of a few percent can be reached, for vanadium the effect reaches up to 125% and is large over a wide energy range. The calculated large effect for vanadium is quite surprising and motivates further investigation.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg