Description:

A common technique for reversing the nuclear spins in NMR is to apply a special radio-frequency magnetic field pulse known as a pi-pulse. Can we reverse the magnetization of a magnetic particle by a similar pulse? The answer is no. The obstacle is a parametrically amplified dynamic instability discovered by Suhl (1955-58). The talk will present our attempts to beat the Suhl instability by applying specially phased and chirped pulses, studied by numerical solution of the spin dynamics in magnetic nanocylinders. The first half of the talk will be a grad-student-level discussion of ferromagnetic resonance and magnetostatic modes.

Authored by Jinho Lim UIUC, John Ketterson and Anupam Garg, Northwestern University

Speaker: Anupam Garg, Professor, Northwestern University