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

TT: Fachverband Tiefe Temperaturen

TT 7: Fluctuations, Noise, Magnetotransport, and Related Topics

TT 7.8: Vortrag

Montag, 5. September 2022, 17:00–17:15, H23

Magnetic and transport behaviour of quasi 2D NiS₂ flakes — •Roman Hartmann¹, Mario Amado Montero², Elke Scheer¹, and Angelo Di Bernardo¹ — ¹Fachbereich Physik, Universität Konstanz, Germany — ²Department of Physics, University of Salamanca, Spain

Spintronics with 2D materials is emerging as a new field which enables development of devices with novel functionality compared to their three-dimensional counterparts.

We have recently managed to cleave single crystal NiS₂ down to the quasi 2D limit despite it not being a layered material. Bulk NiS₂ is a Mott insulator that has an interesting magnetic structure with an antiferromagnetic phase below 39 K and weak ferromagnetic ordering with a Curie temperature of 29 K. [1]

In transport measurements of thin flakes we see an increase in conductivity compared to the bulk, presumably due to the presence of metallic surface states. The ferromagnetic transition is clearly visible as kinks in the R-T curves and R-H curves . With magnetic field applied there is a complex hysteretic behaviour in the resistance with a strong asymmetry with respect to the direction of the applied field.

As a next step we are also looking into coupling the NiS₂ flakes to 2D superconductors to create two-dimensional superconducting spintronic devices.

[1] T. Thio et al., Phys. Rev. B 52, 5 (1995)