Direct visualization of dipolar ferromagnetic domain structures in Co nanoparticle monolayers by electron holography
Direct visualization of dipolar ferromagnetic domain structures in Co nanoparticle monolayers by electron holography
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DOI：
10.1063/1.2973675
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发表时间：
2008-08-25
影响因子：
4
通讯作者：
Hirayama, Tsukasa
中科院分区：
文献类型：
--
作者：
Yamamoto, Kazuo;Majetich, Sara A.;Hirayama, Tsukasa
电子全息显示偶极铁磁畴结构的有序单层阵列的钴纳米粒子。在零场冷却实验中，我们证明了具有横向畴壁和空间变化的矩序参数的微米级磁有序区域的形成。截断的旋涡结构，可以通过施加的场附近的样品边缘观察到修改。集体磁化状态显示出软磁性和长程有序，在108 K下稳定超过1 h。(C)2008年美国物理学会。
Electron holography has revealed dipolar ferromagnetic domain structures in ordered monolayer arrays of Co nanoparticles. In zero-field-cooling experiments, we demonstrate the formation of micron-sized magnetically ordered regions with transverse domain walls, and a spatially varying moment order parameter. Truncated vortex structures that can be modified by an applied field are observed near the sample edges. The collectively magnetized state shows soft magnetic properties and long-range order that is stable over times over 1 h at 108 K. (C) 2008 American Institute of Physics.