The advantages of the magnetic structure in ferromagnetic-film-coated carbon nanotube probes
The advantages of the magnetic structure in ferromagnetic-film-coated carbon nanotube probes
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DOI：
10.1088/0957-4484/23/3/035501
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发表时间：
2012-01-27
期刊：
影响因子：
3.5
通讯作者：
Kuramochi, H.
中科院分区：
文献类型：
--
作者：
Manago, T.;Asada, H.;Kuramochi, H.
采用三维微磁学模拟方法，对磁力显微镜（MFM）用碳纳米管（CNT）探针和普通锥形探针的磁结构进行了模拟。探针总直径小于60 nm的CNT-MFM探针沿CNT的纵向沿着几乎均匀磁化，这是用于MFM观测的理想磁性结构。另一方面，金字塔探头的尖端周围有一个漩涡结构，这表明它们需要更大厚度的铁磁膜，因为只有部分磁矩参与检测样品的杂散场的z分量。CNT-MFM探针的优点是沿着纵向方向的均匀磁化和使用较小涂层厚度的磁成像能力。
The magnetic structures of ferromagnetic-film-coated carbon nanotube (CNT) probes and conventional pyramidal probes for a magnetic force microscope (MFM) were simulated using three-dimensional micromagnetic simulation. The CNT-MFM probes with a total probe diameter less than 60 nm are almost uniformly magnetized along the longitudinal direction of the CNT, which is the ideal magnetic structure for MFM observations. On the other hand, the pyramidal probes had a vortex structure around the point tip, which suggests that they require a greater thickness of the ferromagnetic film because only part of the magnetic moment participates in the detection of the z-component of the stray field from samples. The advantages of the CNT-MFM probe are uniform magnetization along the longitudinal direction and magnetic imaging ability using a smaller coating thickness.