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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
Lawrence Kumar, Pawan Kumar, Mukesh Kumar Zope and M. Kar  
Corresponding Authors:
Manoranjan Kar 
DOI #:
10.1007/s10948-016-3965-5 
Title:
High-Temperature Magnetic Behaviour of 10 % Aluminium-Substituted Cobalt Ferrite 
Journal:
Journal of Superconductivity and Novel Magnetism  
Year:
2017 
Volume:
30 
Page:
1629–1634 
Keywords:
keywords Ferrimagnetic ordering, Blocking temperature, Magnetocrystalline anisotropy, Coercivity 
Abstract:
Magnetic studies on aluminum-substituted cobalt ferrite nanoparticles (CoFe1.9Al0.1 O 4) of average particle size ∼20 nm in the broad range of temperature varying from room temperature (300 K) to 900 K has been presented. The temperature dependence of DC magnetization curve exhibits paramagnetic to ferrimagnetic transition at ∼736 K. Zero field cooling and field cooling magnetization measurement shows that the blocking temperature is far above the room temperature. The presence of ferrimagnetic order in the sample has been analyzed by Arrott plot technique for M-H data measured over the temperature range 300–900 K in the magnetic field of ±9 T. The magnetocrystalline anisotropy constant was determined by employing the “law of approach (LA) to saturation” theory. The saturation magnetization, magnetocrystalline anisotropy constant and coercivity are found to decrease with the increase in temperature. 
Entered by:
Venkata Dantham on 2020-08-02 
 
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