| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic Properties of a Rare-Earth Antiferromagnetic Nanoparticle Investigated with a Quantum Simulation Model |
| LIU Zhao-Sen1**, Sechovský Vladimir2, Diviš Martin2
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1Faculty of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044
2Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
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| Cite this article: |
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LIU Zhao-Sen, Sechovský, Vladimir et al 2011 Chin. Phys. Lett. 28 067302 |
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Abstract A Usov-type quantum model based on a mean-field approximation is utilized to simulate the magnetic structure of an assumed rare-earth nanoparticle consisting of an antiferromagnetic core and a paramagnetic outer shell. We study the magnetic properties in the presence and absence of an external magnetic field. Our simulation results show that the magnetic moments in the core region orientate antiferromagnetically in zero external magnetic field; an applied magnetic field rotates all of the magnetic moments in the paramagnetic shell completely to the field direction, and turns those in the core (which tries to maintain its original antiferromagnetic structure) towards the orientation in some degree; and the paramagnetic shell does not have a strong influence on the magnetic configuration of the core.
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| Keywords:
73.63.Bd
75.75.-c
75.10.Dg
75.40.Mg
75.50.Ee
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Received: 03 December 2010
Published: 29 May 2011
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| PACS: |
73.63.Bd
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(Nanocrystalline materials)
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75.75.-c
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(Magnetic properties of nanostructures)
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75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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75.40.Mg
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(Numerical simulation studies)
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75.50.Ee
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(Antiferromagnetics)
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