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Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-91387 |
Author: | Evans, Richard; Nowak, Ulrich; Dorfbauer, Florian; Schrefl, Thomas; Mryasov, Oleg; Chantrell, Roy W.; Grochola, Gregory |
Year of publication: | 2006 |
Published in: | Journal of Applied Physics ; 99 (2006). - 08G703 |
DOI (citable link): | https://dx.doi.org/10.1063/1.2167636 |
Summary: |
We have investigated the effect of lattice fluctuations on the magnetic properties of nanoparticles of Fe and Co. Atomic structures were simulated using a molecular-dynamic approach, with the system slowly cooled into the ordered phase. The magnetic properties were then simulated using an atomistic approach using a classical spin Hamiltonian taking into account the long-range nature and atomic separation dependence of the exchange. The magnetic properties are found to be affected by both the particle shape and the lattice fluctuations. For a perfectly ordered lattice we find that a spherical particle has a larger magnetization for a given temperature than a cube containing the same number of atoms. We have also studied the effect of lattice fluctuations. This involves a comparison of M(T)or two cases, firstly, a nanoparticle with a fixed lattice corresponding to the low-temperature annealed state (T=20 K), and secondly a nanoparticle with a lattice structure equilibrated at the temperature T, the latter case being subject to fluctuations in the lattice spacing, and the nanoparticle shape. The dynamic structure gives rise to a reduction in the magnetization and Tc, which is a finite size effect to be considered beyond others such as the reduction in coordination at the nanoparticle surface.
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Subject (DDC): | 530 Physics |
Link to License: | In Copyright |
EVANS, Richard, Ulrich NOWAK, Florian DORFBAUER, Thomas SCHREFL, Oleg MRYASOV, Roy W. CHANTRELL, Gregory GROCHOLA, 2006. The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles. In: Journal of Applied Physics. 99, 08G703. Available under: doi: 10.1063/1.2167636
@article{Evans2006influ-9212, title={The influence of shape and structure on the Curie temperature of Fe and Co nanoparticles}, year={2006}, doi={10.1063/1.2167636}, volume={99}, journal={Journal of Applied Physics}, author={Evans, Richard and Nowak, Ulrich and Dorfbauer, Florian and Schrefl, Thomas and Mryasov, Oleg and Chantrell, Roy W. and Grochola, Gregory}, note={Article Number: 08G703} }
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