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

Discipline

• 75.40.Gb: Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
• 75.75.Fk: Domain structures in nanoparticles
• 75.50.Vv: High coercivity materials

• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 1002-1004

Dates

published

2010-11

Contributors

author

A. Zeleňáková

• Department of Solid State Physics, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

author

V. Zeleňák

• Department of Inorganic Chemistry, P.J. Šafárik University, Moyzesova 11, 04001 Košice, Slovakia

author

J. Bednarčík

• DESY-Hasylab, Notkestr. 85, Hamburg, Germany

author

M. Lauda

• Department of Solid State Physics, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

References

• 1. J.P. Wang, Proc. IEEE 96, 1847 (2008)
• 2. J.A. Christodoulides, Y. Zhang, G.C. Hadjipanayis, C. Fountzoulas, IEEE Trans. Magn. 36, 2333 (2000)
• 3. K. Shinoda, K. Sato, B. Jeyadevan, K. Tohji, IEEE Trans. Magn. 42, 3051 (2006)
• 4. K. Sibnath, R.R. Vijayaraghavan, J. Nanosci. Nanotechnol. 10, 5527 (2010)
• 5. M. Delalande, P.R. Marcoux, P. Reiss, Y. Samson, J. Mater. Chem. 17, 1579 (2007)
• 6. A. Zelenakova, J. Kovac, V. Zelenak, J. Appl. Phys. 108, 034323 (2010)

Identifiers

DOI

10.12693/APhysPolA.118.1002