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

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge. Structure of Solids Group and Brookhaven National Lab., Upton, N.Y. (US)
Sponsoring Org.:
US Atomic Energy Commission (AEC) (US)
OSTI Identifier:
4291138
Report Number(s):
AD-206986; AFOSR-TR-58-1058
TRN: US200504%%389
DOE Contract Number:  
AF18(603)-84
Resource Type:
Technical Report
Resource Relation:
Other Information: Sponsored by AEC; Natl Security Agency; and AFOSR.; PBD: 26 Nov 1958
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HEMATITE; NEEL TEMPERATURE; SPECTROMETERS; VECTORS; CHROMIUM OXIDES; FERROMAGNETIC MATERIALS; IRON OXIDES; MAGNETIC FIELDS; MAGNETIC MATERIALS; MAGNETIC MOMENTS; MONOCRYSTALS; NEUTRON BEAMS; NEUTRONS; POLARIZATION; REFLECTION; SCATTERING; THERMAL NEUTRONS

Citation Formats

Nathans, R., Riste, T., Shirane, G., and Shull, C.G. POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4. United States: N. p., 1958. Web. doi:10.2172/4291138.
Nathans, R., Riste, T., Shirane, G., & Shull, C.G. POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4. United States. doi:10.2172/4291138.
Nathans, R., Riste, T., Shirane, G., and Shull, C.G. Wed . "POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4". United States. doi:10.2172/4291138. https://www.osti.gov/servlets/purl/4291138.
@article{osti_4291138,
title = {POLARIZED NEUTRON STUDIES ON ANTIFERROMAGNETIC SINGLE CRYSTALS. Technical Report No. 4},
author = {Nathans, R. and Riste, T. and Shirane, G. and Shull, C.G.},
abstractNote = {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.},
doi = {10.2172/4291138},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 26 00:00:00 EST 1958},
month = {Wed Nov 26 00:00:00 EST 1958}
}

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