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Chin. Phys. B, 2018, Vol. 27(9): 097503    DOI: 10.1088/1674-1056/27/9/097503

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

S Rizwan Ali1, Farah Naz1, Humaira Akber1, M Naeem1, S Imran Ali2, S Abdul Basit3, M Sarim3, Sadaf Qaseem1
1 Department of Physics, Federal Urdu University of Arts, Science and Technology, Karachi, Pakistan;
2 Department of Applied Chemistry and Chemical Technology, University of Karachi, Karachi, Pakistan;
3 Department of Computer Science, Federal Urdu University of Arts, Science and Technology, Karachi, Pakistan

The effect of particle size distribution on the field and temperature dependence of the hysteresis loop features like coercivity (HC), remanence (MR), and blocking temperature (TB) is simulated for an ensemble of single domain ferromagnetic nanoparticles with uniaxial anisotropy. Our simulations are based on the two-state model for T<TB and the metropolis Monte-Carlo method for T>TB. It is found that the increase in the grain size significantly enhances HC and TB. The presence of interparticle exchange interaction in the system suppresses HC but causes MR to significantly increase. Our results show that the parameters associated with the particle size distribution (Dd,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:

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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