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2 Acta Physica Polonica A

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Monte Carlo Simulations of Ferromagnetic Nanocomposites

100%

Woińska M. , Majhofer A. , Gosk J. , Szczytko J.

nr 6

1019-1021

We present results of Monte Carlo simulations of a model system of Co nanoparticles in an external magnetic field. In our simulations we take into account the interaction with the external magnetic field, the energy of crystallographic anisotropy and the dipole-dipole interactions between single domain nanoparticles. We apply the standard Metropolis algorithm to a cluster of 27 randomly distributed superparamagnetic Co nanoparticles. We investigate the dependence of blocking temperature T_{B} on particle and cluster size.

Effect of the Sign of Anisotropy Constants on the Properties of the System of Interacting Ferromagnetic Nanoparticles

75%

Sadek M. , Marchwiany M. , Woinska M. , Majhofer A. , Gosk J. , Twardowski A. , Szczytko J.

Acta Physica Polonica A

2016

tom 129

nr 1a

A-53-A-55

We use the Monte Carlo simulation method to investigate the influence of the signs of magnetocrystalline anisotropy constants and the magnetic dipole-dipole interactions on the zero field cooled-field cooled magnetization experiments and hysteresis curves of a system of magnetic nanoparticles. Positive first cubic anisotropy constant K₁ results in larger blocking temperatures and larger coercive fields of a system, while the second anisotropy constant K₂ is practically of negligible importance for the phenomena investigated. Magnetic dipole-dipole interactions are important only in the most dense systems of particles and their effects practically disappear for systems where the distance between the closest particles exceeds three particle diameters.

Carbon-Encapsulated Magnetic Nanoparticles Based on Fe, Mn, and Cr for Spintronics Applications

63%

Szczytko J. , Osewski P. , Bystrzejewski M. , Borysiuk J. , Grabias A. , Huczko A. , Lange H. , Majhofer A. , Twardowski A.

Acta Physica Polonica A

2007

tom 112

nr 2

305-310

We succeeded in the arc-plasma synthesis of carbon-encapsulated Fe, Cr, and Mn-based nanoparticles. The transmission electron microscopy, Mössbauer spectra (of iron) and SQUID magnetometry results demonstrate that the products of the synthesis contain metals and its carbides. The nanoparticles show ferromagnetic or superparamagnetic behavior at high temperatures, which is demanded for nano-spintronics applications.