title: Suppression of spin diffusion near a micron-size ferromagnet.
abstract: We have used the large gradients generated near the ferromagnetic tip of a magnetic resonance force microscope to locally suppress spin diffusion in a silica sample containing paramagnetic electron spins. By controlling the slice location with respect to the tip, the magnetic field gradient was varied from 0.01 to 36 mT/microm, resulting in a fourfold decrease in T-11 and a similar decrease in T(-1)(1 rho). The observed dependence of the relaxation rates on field gradient is consistent with the quenching of flip-flop interactions that mediate the transport of magnetization between slow and fast relaxing spins.
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099, USA.
authors.forename: R
authors.initials: R
authors.lastname: Budakian
authors.forename: H J
authors.initials: HJ
authors.lastname: Mamin
authors.forename: D
authors.initials: D
authors.lastname: Rugar