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Tunneling Probe of 2D and Moiré Magnetism

The discoveries of ferromagnetism in single atomic layers have opened a new avenue for two-dimensional (2D) materials research. Not only do they raise fundamental questions regarding the requirements for long-range magnetic order in low-dimensional systems, but they also provide a new platform for the development of spintronic devices. In this talk, I will present a series of studies on the layered ferromagnetic insulator, CrI3, both in the atomically thin limit and in twisted homostructures. By incorporating natural 2D CrI3 as tunnel barriers between graphene electrodes, we are able to achieve extremely large tunnel magnetoresistance and directly observe its spin wave, or magnon, excitation spectrum, from which we can then obtain a simple microscopic Hamiltonian for the monolayer spin system. For twisted CrI3, we observe two classes of moiré magnetic textures, giving rise to nonvolatile tunneling magnetoresistance states that can be switched by magnetic field. 

Host: Sergio de la Barrera/Young-June Kim
Event series  Toronto Quantum Matter Seminars