Tunneling Probe of 2D Magnetism
Adam Wei Tsen
Department of Chemistry and Institute for Quantum Computing
University of Waterloo
Abstract: The recent 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 family of layered ferromagnetic semiconductors, CrX3 (X = I, Br, Cl), in the atomically thin limit. By incorporating these materials as tunnel barriers between graphene electrodes, we are able to achieve extremely large tunnel magnetoresistance as well as robust memristive switching that is tunable with magnetic field. Tunneling spectroscopy further allows for direct observation of their spin wave excitations, or magnons, from which we are able to derive a simple microscopic Hamiltonian for all three spin systems. These results show that strong exchange anisotropy is not necessary to stabilize ferromagnetism in the monolayer limit.
Bio: Adam Wei Tsen is an assistant professor at the University of Waterloo in the Department of Chemistry and Institute for Quantum Computing. His group studies various low-dimensional quantum materials and devices. Tsen completed his PhD at Cornell University under the guidance of Jiwoong Park and did postdoctoral research at Columbia University with Philip Kim and Abhay Pasupathy.
Here's the link to Prof. Tsen research web page.