Magnetic Behaviour of Core/Shell Nanoparticle Assemblies: Interparticle Interactions Effects

• Authors: K. Trohidou , M. Vasilakaki
• Languages of publication: EN

Abstracts

EN

Interparticle interactions in assemblies of nanoparticles represent an important effect that modifies their magnetic behavior. The characteristics of the hysteresis loop and the temperature dependent magnetization (field cooled (FC)/zero-field cooled (ZFC)) are studied numerically in magnetic nanoparticle assemblies using Monte Carlo simulations and the standard Metropolis algorithm. We study composite spin nanostructures with ferromagnetic (FM) core/antiferromagnetic (AFM) shell morphology and simple ferromagnetic nanostructures. Both three-dimensional granular solids and two-dimensional ordered nanoparticle arrays are analyzed and compared, with emphasis on the interplay between single-particle characteristics and magnetostatic interparticle interactions. We find that the antiferromagnetic interface provides a strong exchange coupling with the ferromagnetic core and, through it, an effective long range interparticle correlation, modified from that of simple FM nanostructures. The results of our simulations are compared with experimental findings.

Keywords

EN

75.50.Tt; 75.40.Mg; 75.50.Bb; 75.50.Vv; 75.30.Et; 75.60.Ej; 75.50.Lk; 75.50.Cc; 75.50.Ss; 75.75.+a

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 75.40.Mg: Numerical simulation studies
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 75.50.Ss: Magnetic recording materials(for magnetic recording devices, see 85.70.Li)
• 75.50.Lk: Spin glasses and other random magnets
• 75.60.Ej: Magnetization curves, hysteresis, Barkhausen and related effects(for hysteresis in ferroelectricity, see 77.80.Dj)
• 75.50.Cc: Other ferromagnetic metals and alloys
• 75.50.Vv: High coercivity materials
• 75.50.Bb: Fe and its alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 117
• Issue: 2
• Pages: 374-378

Dates

published

2010-02

Contributors

author

K. Trohidou

• Computational Materials Science Group, Institute of Materials Science, NCSR Demokritos, 153 10 Athens, Greece

author

M. Vasilakaki

• Computational Materials Science Group, Institute of Materials Science, NCSR Demokritos, 153 10 Athens, Greece

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Identifiers

DOI

10.12693/APhysPolA.117.374