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2012A 期 採択長期利用課題の中間評価について

公益財団法人高輝度光科学研究センター
利用業務部

第 46 回 SPring-8 利用研究課題審査委員会長期利用分科会（平成 25 年 10 月）において、2012A 期に採択された 1 件の長期利用課題の中間評価が行われました。
長期利用課題の中間評価は、実験開始から 1 年半が経過した課題の実験責任者が成果報告を行い、長期利用分科会が、対象課題の 3 年目の実験を実施するかどうかの判断を行うものです。以下に対象課題の評価結果および評価コメントを示します。

課題名

Development of Spin-HAXPES
technique for the Exploration of theElectronic structure of Buried layers
and Interfaces

実験責任者（所属）Claudia Felser（Max Planck Institute ofchemical physics of solids）

採択時の課題番号 2012A0043
利用ビームライン BL47XU
評価結果

3年目を実施する〔評価コメント〕
The aim of this long-term proposal is to develop
spin polarized high-resolution hard x-ray photoemission
spectroscopy (SPIN-HAXPES) technique, which isexpected to play an essential role in investigating materials

concerning spintronics devices. The review committee
agrees that this bulk-sensitive spin-resolved technique
is essential to investigate electronic and magnetic
structures of buried layers and interfaces of such devices

and appreciates the potential impact on the field. The
committee appreciates also the HAXPES results, aswell as new developments such as in-operand HAXPES,obtained by the group in 2012A and B. The committee,
however, has a great concern about the significant delayof the main part of the project i.e., “SPIN”-HAXPES. In
2012A and B, the group faced the problems of a broken
power supply and a broken detector and as a result they

could not perform the planned spin-resolved experiments.
In 2013A, the group succeeded to make the overallsystem (Scienta analyser + SPLEED-type spin detector)
work, but found extremely low counts and consequently
could not observe spin-resolved signals. The constructionof the 2D detection system is also delaying significantly.
Although the committee concludes that it is appropriate
to give another year for this long-term project, noting
the significance and importance of the realization ofSPIN-HAXPES, the committee strongly requests to thegroup to prepare the experiments carefully, testing thepower supply, the lens system, and the detectors prior toeach beam time. Also the committee requests the groupto estimate the count rates of the spin-resolved signals
based on the cross sections, available photon numbers,
estimated transmission and detection efficiency for theentire system, and define the most reasonable photon
energy for bulk-sensitive SPIN-HAXPES.
〔成果リスト〕（査読付）［1］SPring-8 publication ID = 23225

S. Ouardi, T. Kubota, G. H. Fecher, R. Stinshoff, S.
Mizukami, T. Miyazaki, E. Ikenaga and C. Felser:“Stoichiometry Dependent Phase Transition in MnCo-Ga-based Thin Films: From Cubic in-plane,
Soft Magnetized to Tetragonal Perpendicular, Hard
Magnetized” Applied Physics Letters 101 (2012)

242406.

［2］SPring-8 publication ID = 24784
R. Shan, S. Ouardi, G. H. Fecher, L. Gao, A. Kellock,K. P. Roche, M. G. Samant, C. E. Vidal Barbosa,E. Ikenaga, C. Felser and S. S. Parkin: “Electronicand crystalline structures of zero band-gap LuPdBi
thin films grown epitaxially on MgO(100)” Applied
Physics Letters 102 (2013) 172401.
SPring‑8 利用者情報／2014 年 2 月 40

SPring-8 COMMUNICATIONS［3］SPring-8 publication ID = 25119
C. E. Viol Barbosa, S. Ouardi, G. H. Fecher, D.
Ebke and C. Felser: “Magnetic dichroism in angularresolved hard X-ray photoelectron spectroscopy
from buried magnetic layers” Journal of Electron
Spectroscopy and Related Phenomena 189 (2013)
146-151.

41 SPring‑8 Information／Vol.19 No.1 FEBRUARY 2014