BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Adam Wei Tsen \, University of Waterloo \n\n
The recent discoveries of ferromagnetism in single atomic layers have ope ned 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 p latform for the development of spintronic devices. In this talk\, I will p resent a series of studies on the family of layered ferromagnetic semicond uctors\, CrX3 \;(X = I\, Br\, Cl)\, in the atomically thin limit. By incorporating these materials as tunnel barriers between graphe ne electrodes\, we are able to achieve extremely large tunnel magnetoresis tance as well as robust memritive switching that is tunable with magnetic field. Tunneling spectroscopy further allows for direct observation of the ir 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 ferroma gnetism in the monolayer limit.
\n DTSTART:20190530T150000Z LOCATION:Physics Building\, Room 313 SUMMARY:Two-dimensional magnetism and spintronics END:VEVENT END:VCALENDAR