POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4

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The theory of neutron scattering by magnetic crystals as given by Halpern and Johnson predicts changes in the polarization state of the neutron beam upon scattering which depend upon the relative orientation of the neutron polarization vector and the crystal magnetic axis. This was investigated experimentally with a polarized beam spectrometer using single crystals of Cr{sub 2}O{sub 3} and alpha - Fe{sub 2}O{sub 3} in which reside netic axes. Studies were made on several different reflections in both crystals for a number of different temperatures both below and above the Neel point. Results support the theoretical predictions and indicate directions ... continued below

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Medium: P; Size: : 12 pages

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Nathans, R.; Riste, T.; Shirane, G. & Shull, C.G. November 26, 1958.

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Description

The theory of neutron scattering by magnetic crystals as given by Halpern and Johnson predicts changes in the polarization state of the neutron beam upon scattering which depend upon the relative orientation of the neutron polarization vector and the crystal magnetic axis. This was investigated experimentally with a polarized beam spectrometer using single crystals of Cr{sub 2}O{sub 3} and alpha - Fe{sub 2}O{sub 3} in which reside netic axes. Studies were made on several different reflections in both crystals for a number of different temperatures both below and above the Neel point. Results support the theoretical predictions and indicate directions for the moments in these crystals consistent with previous work. A more detailed study of the polarization changes in the (111) reflection in alpha - Fe{sub 2}O{sub 3} at room temperature on application of a magnetic field was carried out, The results indicate that the principal source of the parasitic ferromagnetism in hematite is essentially independent of the orientation of the antiferromagnetic domains within the crystal.

Physical Description

Medium: P; Size: : 12 pages

Notes

NTIS; OSTI as DE04291138

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  • Other Information: Sponsored by AEC; Natl Security Agency; and AFOSR.

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  • Report No.: AD-206986
  • Report No.: AFOSR-TR-58-1058
  • Grant Number: AF18(603)-84
  • DOI: 10.2172/4291138 | External Link
  • Office of Scientific & Technical Information Report Number: 4291138
  • Archival Resource Key: ark:/67531/metadc1023578

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  • November 26, 1958

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  • Oct. 15, 2017, 10:09 p.m.

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  • Jan. 30, 2018, 12:38 p.m.

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Nathans, R.; Riste, T.; Shirane, G. & Shull, C.G. POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4, report, November 26, 1958; United States. (digital.library.unt.edu/ark:/67531/metadc1023578/: accessed August 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.