Vol 7, No 3 (2016) > Metalurgy and Material Engineering >

The Effect of Induced Magnetic Anisotropy on the Hysteresis Parameter of Nano Barium Strontium Hexaferrite Prepared by Mechanical Alloying and Sonification

Novizal Novizal, Azwar Manaf, Musfirah Cahya Fajrah

 

Abstract: In this research,
analysis of the magnetic properties of the nanoscale ferromagnetic material
barium strontium hexaferrite with the composition of Ba(0.7)Sr(0.3)O6(Fe2O3)
or written as B7S3HF is conducted. The material was
prepared by the ball mill method, followed by reducing the particle sizes of the material to reach a result in nanometers with a
high pressure ultrasonic for 12 hours. In the compacting process, a parameter was given from the outside of the 50 mT
magnetic field to determine the cause
of the anisotropy
phenomenon of the material. To identify the phase of material, changes in the
magnetic properties and measurement of the Particle Size of the B7S3HF material were taken. The equipment used was X-Ray Diffraction (XRD), Permagraph (an automatic computer-contolled measuring system) and Particle Size Analyzer (PSA). The results of XRD were seen in their influence against the Buffered Hydrofluoric (BHF) acid, which were caused by the effects of the Strontium (Sr) substitution and by
increasing the size
of the material volume. Changes in the magnetic properties of the B7S3HF
material, due to an induced magnetic field from the outside, were caused in contrast with the
remanent value ranging from 0.18 T up to 0.249 T,
respectively. This process did not occur, since the
coersivity value was fixed at 275.54 kAm-1. Changes in the value of the remanent
material rose by 0.069 T or
(6.9%). This phenomenon shows the
anisotropy influence in the
B7S3HF material in an external magnetic induction of 50
mT. The results of the ultrasonic measurements were performed using Particle
Size Analyzer (PSA) equipment, which
gained a 43.5 nm particle size.
Keywords: Magnetic induction; Mechanical alloying; Remanent coercivity; Sonication

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