Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity: Topological Defects in Superconductors and Magnets (joint session TT/MA)

TT 22.5: Talk

Monday, March 12, 2018, 16:00–16:15, HFT-FT 101

Coupling of magnetic flux quanta to tunable domain structures in superconductor/ferromagnet bilayers with varying Dzyaloshinskii-Moriya interaction — •Palermo Xavier¹, Samokhvalov Alexei³, Collin Sophie¹, Bouzehouane Karim¹, Santamaria Jacobo¹, Sander Anke¹, Reyren Nicolas¹, Cros Vincent¹, Buzdin Alexander², and Villegas Javier E.¹ — ¹Unité Mixte de Physique CNRS-Thales, Palaiseau, France — ²Laboratoire Ondes et Matière d'Aquitaine (LOMA), Talence, France — ³N.Novgorod, Russia

We study magneto-transport in hybrids combining superconducting films with magnetic multilayers in which varying the stacking sequence (e.g. Co/Pt vs. Ir/Co/Pt) allows tailoring the interfacial Dzyaloshinskii-Moriya interaction, and the characteristics of the magnetic domain structure. The magnetoresistance in the superconducting state shows a strong hysteresis, which is observed during the magnetization reversal and closely follows the reversal details. This behavior is in stark contrast with that expected for a plain superconducting film, and is strongly dependent on the size and morphology of the domain structure (presence of wormlike or skyrmion structures). The results can be understood in terms of mutual interaction between flux quanta and the local magnetization, which modifies vortex nucleation and mobility, and possibly the magnetic structure in the ferromagnets.

Work supported by the ERC grant N 64710 and French ANR grant ANR-15-CE24- 0008-01