Effect of particle size distribution on magnetic behavior of nanoparticles with uniaxial anisotropy

doi:10.1088/1674-1056/27/9/097503

Abstract

The effect of particle size distribution on the field and temperature dependence of the hysteresis loop features like coercivity (H_C), remanence (M_R), and blocking temperature (T_B) is simulated for an ensemble of single domain ferromagnetic nanoparticles with uniaxial anisotropy. Our simulations are based on the two-state model for T<T_B and the metropolis Monte-Carlo method for T>T_B. It is found that the increase in the grain size significantly enhances H_C and T_B. The presence of interparticle exchange interaction in the system suppresses H_C but causes M_R to significantly increase. Our results show that the parameters associated with the particle size distribution (D_d,δ) such as the mean particle size d and standard-deviation δ play key roles in the magnetic behavior of the system.

Keywords: magnetic nanoparticles Monte Carlo simulations size distribution interparticle interaction hysteresis

Received: 10 April 2018
Revised: 29 June 2018
Accepted manuscript online:

PACS:	75.50.Tt	(Fine-particle systems; nanocrystalline materials)
	75.40.Mg	(Numerical simulation studies)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Corresponding Authors: S Rizwan Ali
E-mail: rizwan@fuuast.edu.pk

Cite this article:

S Rizwan Ali, Farah Naz, Humaira Akber, M Naeem, S Imran Ali, S Abdul Basit, M Sarim, Sadaf Qaseem Effect of particle size distribution on magnetic behavior of nanoparticles with uniaxial anisotropy 2018 Chin. Phys. B 27 097503

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Effect of particle size distribution on magnetic behavior of nanoparticles with uniaxial anisotropy

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