Mechanical pumping and filtering of spin-polarized condensate were realized in the superfluid 3He A1 phase
by the pneumatic pumping action of an electrostatically actuated diaphragm. Spin pumping increased the net
spin polarization by 20 – 50 % as measured by the induced pressure change during spin pumping. The observed
spin relaxation time was consistent with the increased spin polarization. These observations demonstrate the
feasibility of using spin pumping to substantially increase the effective magnetic field to which the A1 phase is
exposed.
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