Pullar, R.C. and Bhattacharya, A. K.. (2006) The magnetic properties of aligned M hexa-ferrite fibres. Journal of Magnetism and Magnetic Materials, Vol.300 (No.2). pp. 490-499. ISSN 0304-8853

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Abstract

Aligned and random fibres of strontium hexaferrite (SrM, Si-Fe12O19) and barium hexaferrite (BaM, BaFe12O19) were manufactured by blow spinning from an aqueous inorganic sol-gel precursor, which was then fired to give the hexagonal ferrite fibre. Their magnetic properties were studied by VSM, investigating the evolution of these properties with firing and measurement temperature, and in particular the effects of fibre alignment. It has been predicted that aligned ferrite fibres will demonstrate an enhanced magnetisation along the axis of alignment with respect to perpendicular to the axis, and this has been demonstrated here For the first time. The optimum firing temperature was 1000 degrees C, at which point they still had submicron grains. In BaM random fibres M-s=63.8emu g(-1) and H-c=428.1 kA m(-1) and in SrM random fibres M-s=63.3 emu g(-1) and H-c=452.8 kA m(-1), high values for polycrystalline materials. Fibres aligned parallel to the applied field had saturation magnetisation (M-s) values equal to those of the random fibres, whilst fibres aligned perpendicular to the field had All, values 62% and 75% lower, for BaM and SrM, respectively. There was no change in coercivity (H-c) between random or aligned fibres of any orientation, and fibres aligned 45 degrees and parallel to H appeared identical. Therefore, properties along the axis of alignment were superior when compared to measurements perpendicular to the axis of alignment, giving a directionality to the magnetisation in an otherwise randomly oriented ferrite material. (c) 2005 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Journal of Magnetism and Magnetic Materials
Publisher:	Elsevier Science BV
ISSN:	0304-8853
Date:	May 2006
Volume:	Vol.300
Number:	No.2
Number of Pages:	10
Page Range:	pp. 490-499
Identification Number:	10.1016/j.jmmm.2005.06.001
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/33695

Data sourced from Thomson Reuters' Web of Knowledge

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