Suppression of Spin Diffusion near a Micron-size Ferromagnet

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 1 × 10-4 to 0.36 G/nm, resulting in a 4× decrease in T1 -1 and a similar decrease in T1p -1 . 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.

By: R. Budakian, H. J. Mamin, D. Rugar

Published in: Physical Review Letters, volume 92, (no 3), pages No. 037205 in 2004

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