Achieving a high cutting-off frequency in the oriented CoFe2O4 nanocubes

Achieving a high cutting-off frequency in the oriented CoFe2O4 nanocubes
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在定向 CoFe2O4 纳米立方体中实现高截止频率

DOI:
10.1063/1.5000014
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发表时间:
2017-09
影响因子:
4
通讯作者:
Cheng Zhaohua
Cheng Zhaohua
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Song Ningning;Gu Shangzhi;Zhou Jun;Xia Weixing;Zhang Panpan;Gul Qeemat;Wang Wei;Yang Haitao;Cheng Zhaohua

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通过对CoFe_2O_4纳米立方体(NC)施加磁场后的取向,证明了提高共振频率的有效途径。获得了CoFe_2O_4纳米晶阵列的磁全息图像,发现单个CoFe_2O_4纳米晶中存在着与偶极相互作用密切相关的涡旋畴结构。此外,8.8 GHz的定向CoFe2O4 NC的截止频率实现了在极低的质量分数(约10%)的磁导率略有增加。该工作为优化磁性纳米材料在GHz以上的高频性能提供了一种有效途径。
An effective way for the improvement of resonance frequency was demonstrated by the orientation of CoFe2O4 nanocubes (NCs) after applying a magnetic field. The magnetic holography image of the oriented CoFe2O4 NC arrays was obtained, and the vortex domain structure was found in single CoFe2O4 NCs, which greatly depends on dipolar interactions. Moreover, the cutting-off frequency of oriented CoFe2O4 NCs of 8.8 GHz is achieved with a slight increase in permeability at an extremely low mass fraction (about 10%). This work provides an effective way for optimizing the high-frequency properties of magnetic nanomaterials above GHz.
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