التفاصيل البيبلوغرافية
| العنوان: |
Effect of Si interlayers on the magnetic and mechanical properties of Fe/Ge neutron polarizing multilayer mirrors. |
| المؤلفون: |
Maruyama, R.1, Yamazaki, D.1, Okayasu, S.2, Takeda, M.1,3, Zettsu, N.4, Nagano, M.4, Yamamura, K.4, Hayashida, H.1, Soyama, K.1 |
| المصدر: |
Journal of Applied Physics. Mar2012, Vol. 111 Issue 6, p063904. 10p. 1 Chart, 11 Graphs. |
| مصطلحات موضوعية: |
*MULTILAYER mirrors, *SILICON, *MAGNETISM, *MECHANICS (Physics), *PHYSICS |
| مستخلص: |
The neutron polarizing supermirror is one of the most important optical devices for polarizing neutron beams. To meet a variety of research demands, neutron polarizing supermirrors need to display high polarization efficiencies at low external magnetic fields. Fe/Si and Fe/Ge multilayers are typically used in neutron polarizing supermirrors because the contrast in scattering length densities almost vanishes for spin-down neutrons. The Fe/Si/Ge/Si multilayer, obtained by adding thin interlayers of Si to an Fe/Ge multilayer, is effective in reducing the external field strength necessary to achieve efficient neutron polarization. To gain insight into the mechanism that controls the required external field strength for a neutron polarizing supermirror, we investigated the magnetic and mechanical properties of Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers. The external field strength required to achieve efficient neutron polarization was found to be proportional to the compressive film stress. The compressive stress of the Fe/Si/Ge/Si multilayer was smaller by a factor of 4.4 and 2.7 than that of Fe/Si and Fe/Ge multilayers, respectively. These measurements and analyses showed that a reduction in the compressive film stress in the Fe/Si/Ge/Si multilayer permits the use of lower external field strength to achieve efficient neutron polarization. X-ray photoelectron spectroscopic studies showed that the formation of a Ge-Si solid solution in the Ge layer may explain the marked reduction in compressive stress in the case of the Fe/Si/Ge/Si multilayer. This study confirmed that a reduction in compressive film stress is very important for a high-performance neutron polarizing supermirror. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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