SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Spin-Dependent 2D Phenomena

MA 4.1: Hauptvortrag

Dienstag, 28. September 2021, 10:00–10:30, H5

2D Magnetic materials — •Alberto Morpurgo — University of Geneva

Exfoliation of thin crystals from van der Waals bonded parent compounds allows the realization of atomically thin layers, exhibiting new phenomena, properties and functionality. For atomically thin magnetic materials, this strategy has been followed only recently, and has led to multiple interesting results. In my talk I will mainly focus on the investigation of 2D semiconducting magnetic materials by means of transport measurements. I will discuss how we use atomically thin layers to realize tunnel barriers, and measure the temperature and magnetic field dependence of the tunneling resistance to extract detailed information about their magnetic phase diagram. In a first generation of experiments we have demonstrated the principle for diferent antiferromagnetic semiconductors (CrI₃, CrCl₃, MnPS₃), and extracted important microscopic information about the phase transitions occurring in these systems (and in some cases about the relevant exchnage integrals). More recently we have shown that the technique also works for ferromagnets such as CrBr₃, using which we are able to infer detailed information about the magnetic field and temperature dependence of the tubnneling resistance (both in the ferromagnetic and in the paramagnetic state).