Magnetic Properties of Fe@Pt Nanoparticles with Core/Shell Morphology

• Authors: A. Zeleňáková , V. Zeleňák , J. Bednarčík , M. Lauda , J. Kováč
• Languages of publication: EN

Abstracts

EN

We have investigated the magnetic properties of iron nanoparticles coated by platinum shell prepared by chemical procedure. Magnetic measurements using SQUID magnetometer confirm the behaviour typical for a superparamagnetic system. From the M(H) loop at 300 K the magnetic moment of each particle m_{P} ≈ 250 μ_{B} was calculated. The magnetic relaxation study by the in-phase χ' and out-of-phase χ" ac susceptibilities in frequency range 0.1-1000 Hz suggests the existence of two magnetic layers with different magnetic spin's dynamics and strong dipolar interactions between nanoparticles. The observed magnetic behaviour is caused by the blocking process of interacting superparamagnetic particles with magnetic iron core, diamagnetic platinum shell and spin-glass like behaviour magnetic interlayer between them.

Keywords

EN

75.75.Fk   75.50.Vv   75.40.Gb  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 1002-1004

Dates

published

2010-11

References

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Identifiers

DOI

10.12693/APhysPolA.118.1002