Recent Spin Pump Experiments on Superfluid 3He–A1

The superfluid 3 He A 1 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 3 He in a small...

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Bibliographic Details
Published in:Journal of low temperature physics 2013-05, Vol.171 (3-4), p.220-225
Main Authors: Yamaguchi, A., Kamada, N., Motoyama, G., Sumiyama, A., Aoki, Y., Okuda, Y., Kubota, M., Kojima, H.
Format: Article
Language:English
Subjects:
Aluminum oxide
Characterization and Evaluation of Materials
Condensed Matter Physics
Construction
Density
Earthquake damage
Fluids
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Pumps
Seismic phenomena
Superfluidity
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Summary:The superfluid 3 He A 1 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 3 He in a small chamber. We are developing new apparatus for achieving greater enhancement of spin density. A development of a new-type 3 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 4 He, but has not been established for that of the superfluid 3 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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-012-0695-3