Regensburg 2022 – wissenschaftliches Programm
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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)