Comprehensive Exam for Uday Singh
Supervisor: Prof. Shireen Adenwalla
Abstract:
The interaction of light with matter is not only well known but is also widely used to probe material properties or to manipulate the polarization of light. The interaction of a femtosecond laser pulse with a magnetic material can excite spin dynamics in a system, and the time scales of such dynamics depend upon the associated energy. In antiferromagnets, the frequency of exchange resonance is much higher than the resonance observed in ferromagnets. In ferrimagnets, both ferromagnetic and exchange resonance modes exist due to the presence of both antiferromagnetic coupling and non-zero net magnetization in the system. In this talk, the dynamics of magnetic phenomenon in antiferromagnets and ferrimagnets induced by ultrashort laser pulses will be addressed. The detailed discussion will include the fast spin orientation in ferrites, coherent control of spin dynamics, transient ferromagnetism, and inertial switching by femtosecond laser pulse in antiferromagnetic coupled systems.