title: Dynamics of two overlapping spin ensembles interacting by spin exchange.
abstract: We describe linear and nonlinear dynamics of spin-polarized K and 3He ensembles interacting by spin exchange. The interactions are dominated by the imaginary part of the spin-exchange cross section and each spin species is primarily affected by the average magnetization of the other. Operating in a very low magnetic field we demonstrate novel dynamics when the electron and nuclear spin precession frequencies are nearly matched. We observe transverse damping as well as a dynamic instability of the 3He spins interacting with polarized K vapor. We also demonstrate operation as a self-compensating comagnetometer, useful for tests of CPT violation and other precision measurements.
authors.affiliation: Department of Physics, Princeton University, New Jersey 08544, USA.
authors.forename: T W
authors.initials: TW
authors.lastname: Kornack
authors.forename: M V
authors.initials: MV
authors.lastname: Romalis