- Series
- Job Candidate Talk
- Time
- Friday, January 31, 2014 - 1:00pm for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Katherine Newhall – Courant Institute
- Organizer
- Michael Lacey
Driving nanomagnets by spin-polarized currents offers exciting
prospects in magnetoelectronics, but the response of the magnet to
such currents remains poorly understood. For a single domain
ferromagnet, I will show that an averaged equation describing the
diffusion of energy on a graph captures the low-damping dynamics of
these systems. In particular, I compute the mean times of thermally
assisted magnetization reversals in the finite temperature system,
giving explicit expressions for the effective energy barriers
conjectured to exist. I will then outline the problem of extending the
analysis to spatially non-uniform magnets, leading to a transition
state theory for infinite dimensional Hamiltonian systems.