Effect of the Sign of Anisotropy Constants on the Properties of the System of Interacting Ferromagnetic Nanoparticles |
| M. Sadek a, M. Marchwianya,b, M. Woinska c, A. Majhofer a, J. Gosk d, A. Twardowski a and J. Szczytko a
aInstitute of Experimental Physics, Faculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warszawa, Poland bInterdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, A. Pawińskiego 5a, 02-106 Warszawa, Poland cFaculty of Chemistry, University of Warsaw, L. Pasteura 1, 02-093 Warszawa, Poland dFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland |
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| 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. |
DOI: 10.12693/APhysPolA.129.A-53 PACS numbers: 75.40.Mg, 75.50.Tt, 75.75.-c |