  Spin exchange interaction between atoms in a spin-1 Bose-Einstein condensate
causes atomic spin evolving periodically under the single spatial mode
approximation in the mean field theory. By applying fast magnetic pulses
according to a two-step or a four-step control protocol, we find analytically
that the spin dynamics is significantly suppressed for an arbitrary initial
state. Numerical calculations under single mode approximation are carried out
to confirm the validity and robustness of these protocols. This localization
method can be readily utilized to improve the sensitivity of a magnetometer
based on spin-1 Bose-Einstein condensates.
