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- Title
Recent Spin Pump Experiments on Superfluid He-A.
- Authors
Yamaguchi, A.; Kamada, N.; Motoyama, G.; Sumiyama, A.; Aoki, Y.; Okuda, Y.; Kubota, M.; Kojima, H.
- Abstract
The superfluid He A phase, containing a spin-polarized condensate allows us to explore the dynamics of superfluid spin current. In the mechano-spin effect (MSE), a mechanically applied pressure gradient and a superleak-spin filter enable one to directly boost spin polarization of He in a small chamber. We are developing new apparatus for achieving greater enhancement of spin density. A development of a new-type He-hydraulic actuator has been already reported. We present here the construction of new-type of superleak-spin-filter made of packed powder aluminum oxide (referred as PAP-SL). The PAP-SL is popular in the study of superfluid He, but has not been established for that of the superfluid He. The attempt to construct the PAP-SL for the spin pump experiment was made by using aluminum oxide powder with nominal 1 μm powder diameter and with packing fraction of 40 %. Before executing the experiment, the nuclear demagnetization cryostat of ISSP, Univ. Tokyo which has been used for this experimental activity, was heavily damaged by the 2011 Great East Japan (Higashi Nihon) Earthquake. The repair work and earthquake damage protection strengthening has just been accomplished.
- Subjects
HELIUM; PHYSICS experiments; SUPERFLUIDITY; DYNAMICAL systems; SPIN polarization; ALUMINUM oxide; POWDER metallurgy
- Publication
Journal of Low Temperature Physics, 2013, Vol 171, Issue 3/4, p220
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-012-0695-3