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Report No.

Doppler-broadening of annihilation radiation spectroscopy under high magnetic field using a longitudinally spin-polarized slow positron beam

Maekawa, Masaki; Zhang, H.; Li, H.; Fukaya, Yuki   ; Kawasuso, Atsuo

A spin-polarized positron beam generated using a $$^{22}$$Na source, solid neon moderator and magnetic lens was developed. The beam diameter, beam flux and spin polarization were 0.5 mm, 1$$times$$10$$^5$$ e$$^+$$ s$$^{-1}$$ and 27 %, respectively. An electromagnet system, which can generate $$pm$$1 T magnetic field, was also developed and equipped with the beam apparatus. Using this apparatus, Doppler broadening of annihilation radiation spectra under a high magnetic field were measured for bulk polycrystalline Fe, Co and Ni samples and a thin film Co$$_2$$MnSi sample. These spectra showed a clear asymmetry upon field reversal.



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