実験報告書様式（プロジェクト利用）

Experimental Report

承認日 Date of Approval 2014/07/19
承認者 Approver TAKEDA Masayasu
提出日 Date of Report 2013/05/15

実験課題番号 Project No.

装置責任者 Name of Instrument scientist

2012P0803

Masayasu TAKEDA

実験課題名 Title of experiment

装置名 Name of Instrument/（BL No.）

Development and application of on-beam SEOP based 3He spin

SHARAKU / BL17

filter at BL17

利用期間 Dates of experiments

実験責任者名 Name of principal investigator2012/01/18-2012/01/24

Takayuki OKU
所属 Affiliation
J-PARC Center
１．研究成果概要（試料の名称、組成、物理的・化学的性状を明記するとともに、実験方法、利用の結果得られた主なデータ、考察、結論、図表等を記述してください。
Outline of experimental results (experimental method and results should be reported including sample
information such as composition, physical and/or chemical characteristics.
Figure 1 shows the picture and schematic top
view of the experiment at BL17 SHARAKU.
All of SEOP 3He spin filter components were
set in the SEOP BOX and the SEOP BOX wasplaced between the 8th slit (S8) and the 9th slit(S9) as shown in fig. 1. A 3He spin filter cell
was placed at z = 16500 mm where z is thedistance from the moderator. The size of 3He
spin filter cell was 35 mm in diameter, 55 mm
in length and pressure length product of thecell was 11 bar cm. A two-dimensional
position sensitive neutron detector RPMT wasplaced at z = 17700 mm. A guide coil was set
between the S8 and the SEOP BOX to avoid
depolarization of a neutron beam. In thisFigure 1. The picture and schematic top view of theexperiment, the 3He spin filter was used as aexperiment are shown. The SEOP BOX was set between theneutronS8 and S9.

spin

supermirror

analyzer.

whichA

consists

polarizingofFe/Si

supermirrors and a neutron spin flipper has been installed at upstream from the sample position [1]. Specular andoff-specular reflections from a sample with and without spin-flip can be measured.
In this study, we aim to evaluate a performance of the 3He spin filter as a neutron spin analyzer. A Fe/Cr
multilayered thin film with the giant magnetoregistance effect was used as a sample [2]. The sample was set atthe z = 15500 mm which is the standard sample position on SHARAKU.

１．研究成果概要（つづき） Outline of experimental results (continued).
Figure 2 shows the result of this measurement,(a) and (b) are the result with the applied magnetic
field condition of 200 Oe with spin-flip and nonspin-flip, (c) and (d) are the applied magnetic field
10 kOe with spin-flip and non spin-flip. In the low
magnetic field condition with applied field of 200Oe, the specular peak and off-specular reflection
around Qz = 0.08 Å -1 are clearly observed,
especially in the spin-flip condition. In the highmagnetic field condition with applied field of 10kOe, both of the specular peak and off-specularreflection around Qz = 0.08 Å -1 are disappeared.
This result indicates the existence of theantiferromagnetic correlations in the low magnetic
field condition, and in the high magnetic field
condition the antiferromagnetic correlations aredisappeared. These results are consistent withthose reported in ref. [2]. A polarization of 3He
reached more than 60 % stably for 5 days during

Figure 2. The obtained reflections as a function of Qx an
Qz. (a) and (b) are the results of weak applied field 200
Oe with spin-flip and non spin-flip, (c) and (d) the strong
applied field 10 kOe with spin-flip and non spin-flip.

this experiment, which was estimated by NMR
measurement. The neutron polarization degree,which is determined by the efficiencies of thepolarizer, spin flipper and 3He spin filter, washigher than 95 % for neutrons with λ ≥ 0.4 nm inthis experiment (fig. 3). The circle (red) and thesquare (blue) are the neutron spin polarization
corresponds to the measurement with applied field
condition of 200 Oe and 10 kOe, respectively.
This result also shows that the 3He spin filter
works well during this experiment.
As a conclusion of this study, the 3He spin filter
worked stably for 5 days with the polarization of3He higher than 60 % and specular andFigure 3. The neutron polarization degree obtained in thismeasurement is shown. The circle (red) and the square(blue) are the neutron spin polarization corresponds tothe measurement with guide field condition of 200 Oe
and 10 kOe, respectively.

off-specular reflections from the Fe/Cr multilayered thin film are successfully measured.
[1] TAKEDA M., et al., Chinese J. Phys., 50 (2012) 161.
[2] M. Takeda, et al., Physica B, 213&214 (1995) 248.

必要に応じて、A4 サイズの用紙に続きを記入して下さい。
Please use A4-size papers for further reporting, if necessary.