Investigation of ferrimagnetism in some compounds using Polarized neutrons

Satya Murthy, N. S. ; Begum, R. J. ; Somanathan, C. S. ; Natera, M. G. (1968) Investigation of ferrimagnetism in some compounds using Polarized neutrons Journal of Applied Physics, 39 (2). p. 631. ISSN 0021-8979

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Polarized neutrons offer a very useful method of studying ferrimagnetic materials such as ferrites, in which the multiplicity of cations and their valence states prevent a unique determination of the spin structure when only polycrystalline material is available. This paper presents the first extensive use of polarized neutron powder-diffraction patterns for determining the structure of a carbide of Mn and Co and of a number of mixed ferrites having the spinel structure. The ferrimagnetic carbide with composition (Mn,Co)4C is found to have a cubic structure of the Mn4N type, with one of the Mn atoms at the cube corner and the face centers being occupied by one Mn and two Co atoms in a statistical distribution. The two Mn atoms are antiferromagnetically aligned with respect to each other, the corner atom having a moment of 4.0μB while the face center moment is 3.0μB. The two Co atoms have a moment of 0.8μB each and are aligned parallel to the corner Mn moment along the cube edges. The material has a Néel temperature of 810°K and saturates at a field of 4.5 kOe. Polarized neutrons were used to choose a structure of cubic symmetry in preference to one of tetragonal symmetry. Two mixed ferrite systems of the general formula MxM'1-xFe2O4 where M = Mg, Zn and M' = Mn, Ni have been studied for various values of x. Their Néel temperatures and cation distributions have been determined.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:34059
Deposited On:30 Mar 2011 10:26
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