Synthesis and characterization of aluminium substituted calcium hexaferrite

V.S Shinde,S.G Dahotre,L.N Singh

doi:10.1016/j.heliyon.2020.e03186

V.S Shinde, S.G Dahotre + Show 1 more

Open Access

https://doi.org/10.1016/j.heliyon.2020.e03186

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Journal: Heliyon	Publication Date: Jan 1, 2020
Citations: 28	License type: cc-by

Affiliation: Dr. Babasaheb Ambedkar Technological University

Abstract

Al substituted M type Ca hexaferrite with composition CaAlxFe12-xO19 (x = 0, 0.2, 0.4, 0.6, 0.8) were synthesized by sol gel auto combustion method. The prepared samples were characterized by XRD, SEM, FTIR and VSM. X ray diffraction study shows that the with increasing aluminum ion concentration lattice parameter a decreases from 5.87 Å to 5.83 Å while the lattice parameter c decreases from 22.15 Å to 22.00 Å are well within the range of M type of hexaferrite. The crystallite size of the particles decreases from 74.36nm to 62.12nm are suitable for magnetic recording. Morphology of the particles from SEM images was hexagonal platelet. The absorption band between 580 and 440cm−1 in FTIR confirm the formation of hexaferrite. The magnetic properties of the samples changes with Al ion substitution make the material suitable for low density longitudinal and perpendicular magnetic recording.

Highlights

The consumer demand for hard disk drive is rapidly increasing because of strong growth of information
Calcium ferrite particles are considered as a promising material for high density magnetic recording, Single domain Ca ferrite particles without substitution have large coercivity
In the present research Al substituted Ca hexaferrite were synthesized by auto combustion method

Summary

Introduction

The consumer demand for hard disk drive is rapidly increasing because of strong growth of information. There are two magnetic recording techniques in hard disk drive, the ancient longitudinal magnetic recording and recent perpendicular recording. In perpendicular recording the size of the disk is reduced which increases the storage capacity. If we get the small particle size and high value of coercivity the material is suitable for perpendicular recording. Calcium ferrite particles are considered as a promising material for high density magnetic recording, Single domain Ca ferrite particles without substitution have large coercivity. The coercivity can be changed by substitution with other diamagnetic or paramagnetic cations [1]

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