Micromagnetic simulations of spinel ferrite particles
| Autor: | Dantas, Christine C., Gama, Adriana M. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Journal of Magnetism and Magnetic Materials, Volume 322, Issue 19, October 2010, Pages 2824-2833 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.jmmm.2010.04.037 |
| Popis: | This paper presents the results of simulations of the magnetization field {\it ac} response (at $2$ to $12$ GHz) of various submicron ferrite particles (cylindrical dots). The ferrites in the present simulations have the spinel structure, expressed here by M$_{1-n}$Zn$_{n}$Fe$_2$O$_4$ (where M stands for a divalent metal), and the parameters chosen were the following: (a) for $n=0$: M = \{ Fe, Mn, Co, Ni, Mg, Cu \}; (b) for $n=0.1$: M = \{ Fe, Mg \} (mixed ferrites). These runs represent full 3D micromagnetic (one-particle) ferrite simulations. We find evidences of confined spin waves in all simulations, as well as a complex behavior nearby the main resonance peak in the case of the M = \{ Mg, Cu \} ferrites. A comparison of the $n=0$ and $n=0.1$ cases for fixed M reveals a significant change in the spectra in M = Mg ferrites, but only a minor change in the M = Fe case. An additional larger scale simulation of a $3$ by $3$ particle array was performed using similar conditions of the Fe$_3$O$_4$ (magnetite; $n=0$, M = Fe) one-particle simulation. We find that the main resonance peak of the Fe$_3$O$_4$ one-particle simulation is disfigured in the corresponding 3 by 3 particle simulation, indicating the extent to which dipolar interactions are able to affect the main resonance peak in that magnetic compound. Comment: 35 pages, 11 figures, Journal of Magnetism and Magnetic Materials, in press. |
| Databáze: | arXiv |
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