Direct observation of dynamical magnetization reversal process governed by shape anisotropy in single NiFe2O4 nanowire†,Nanoscale

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Direct observation of dynamical magnetization reversal process governed by shape anisotropy in single NiFe2O4 nanowire†
Nanoscale ( IF 5.8 ) Pub Date : 2018-05-04 00:00:00 , DOI: 10.1039/c8nr01393d
Junli Zhang _{1,

2,

3,

4,

5} , Shimeng Zhu _{1,

2,

3,

4,

5} , Hongli Li _{1,

2,

3,

4,

5} , Liu Zhu _{1,

2,

3,

4,

5} , Yang Hu _{1,

2,

3,

4,

5} , Weixing Xia _{5,

6,

7,

8,

9} , Xixiang Zhang _{10,

11,

12,

13} , Yong Peng _{1,

2,

3,

4,

5} , Jiecai Fu _{1,

2,

3,

4,

5}

Affiliation

Discovering how the magnetization reversal process is governed by the magnetic anisotropy in magnetic nanomaterials is essential and significant to understand the magnetic behaviour of micro-magnetics and to facilitate the design of magnetic nanostructures for diverse technological applications. In this study, we present a direct observation of a dynamical magnetization reversal process in single NiFe₂O₄ nanowire, thus clearly revealing the domination of shape anisotropy on its magnetic behaviour. Individual nanoparticles on the NiFe₂O₄ nanowire appear as single domain states in the remanence state, which is maintained until the magnetic field reaches 200 Oe. The magnetization reversal mechanism of the nanowire is observed to be a curling rotation mode. These observations are further verified by micromagnetic computational simulations. Our findings show that the modulation of shape anisotropy is an efficient way to tune the magnetic behaviours of cubic spinel nano-ferrites.

中文翻译：

直接观察单个NiFe ₂ O ₄纳米线中由形状各向异性控制的动态磁化反转过程†

发现磁性纳米材料中的磁各向异性如何控制磁化反转过程对于理解微磁性的磁性行为以及促进用于各种技术应用的磁性纳米结构的设计至关重要且意义重大。在这项研究中，我们对单个NiFe ₂ O ₄纳米线中的动态磁化反转过程进行了直接观察，从而清楚地揭示了形状各向异性对其磁行为的支配作用。NiFe ₂ O ₄上的单个纳米颗粒纳米线在剩磁状态下显示为单畴状态，该状态一直保持到磁场达到200 Oe。观察到纳米线的磁化反转机制是卷曲旋转模式。这些观察结果通过微磁计算仿真得到了进一步验证。我们的发现表明，形状各向异性的调制是一种调节立方尖晶石纳米铁氧体磁行为的有效方法。

更新日期：2018-05-04

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