Micromagnetic simulations of spinel ferrite particles
Micromagnetic simulations of spinel ferrite particles
复制标题
尖晶石铁氧体颗粒的微磁模拟
DOI：
10.1016/j.jmmm.2010.04.037
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发表时间：
2010
影响因子：
2.7
通讯作者：
A. M. Gama
中科院分区：
文献类型：
--
作者：
C. C. Dantas;A. M. Gama
本文给出了各种亚微米铁氧体颗粒（圆柱形点）的磁化场交流响应（2- 12 GHz）的模拟结果。本模拟中的铁氧体具有尖晶石结构，在这里用M1− nZnnFe 2 O 4表示（其中M代表二价金属），并且选择的参数如下：（a）对于n=0：M={Fe，Mn，Co，Ni，Mg，Cu };（B）对于n=0.1：M = {Fe，Mg}（混合铁氧体）。这些运行代表完整的3D微磁（单粒子）铁氧体模拟。我们发现在所有的模拟中的限制自旋波的证据，以及一个复杂的行为附近的主共振峰的情况下，M = {Mg，Cu}铁氧体。固定M的n=0和n=0.1的情况下的比较揭示了在M = Mg铁氧体的光谱中的显着变化，但在M = Fe的情况下只有很小的变化。使用Fe 3 O 4（磁铁矿; n=0，M = Fe）单粒子模拟的类似条件进行3 × 3粒子阵列的额外较大规模模拟。我们发现，Fe 3 O 4单粒子模拟的主共振峰在相应的3 × 3粒子模拟中被破坏，表明偶极相互作用能够影响该磁性化合物中的主共振峰的程度。
This paper presents the results of simulations of the magnetization field ac response (at 2–12GHz) of various submicron ferrite particles (cylindrical dots). The ferrites in the present simulations have the spinel structure, expressed here by M1−nZnnFe2O4(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 Fe3O4(magnetite; n=0, M = Fe) one-particle simulation. We find that the main resonance peak of the Fe3O4one-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.