Stroboscopic imaging of an alternating magnetic field from a perpendicular magnetic recording head by frequency-modulated magnetic force microscopy
Stroboscopic imaging of an alternating magnetic field from a perpendicular magnetic recording head by frequency-modulated magnetic force microscopy
复制标题
通过调频磁力显微镜对垂直磁记录头的交变磁场进行频闪成像
DOI：
10.1063/1.4720508
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发表时间：
2012-05-28
影响因子：
4
通讯作者：
Saito, Hitoshi
中科院分区：
文献类型：
--
作者：
Li, Zhenghua;Hatakeyama, Kodai;Saito, Hitoshi
利用我们研制的调频磁力显微镜（FM-MFM）对垂直磁记录头的交流磁场进行成像，该显微镜利用交流磁场对机械振动的悬臂梁进行频率调制。利用FM-MFM技术结合锁相放大器，可以分别获得交流磁场的幅值和相位信号（或正交的X和Y信号）。提出了一种表征调频磁力显微镜交流磁场源的信号变换技术。利用FM-MFM方法结合信号变换算法，实现了垂直记录磁头的二维矢量分析和磁化矢量旋转。利用该技术，本方法为交流磁场源的频闪分析提供了可能性，并为先进磁头的开发提供了非常有用的反馈。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4720508]
The alternating current (ac) magnetic field from perpendicular magnetic recording head was imaged by using our developed frequency-modulated magnetic force microscopy (FM-MFM), which uses the frequency modulation of cantilever oscillation caused by applying ac magnetic field to a mechanically oscillated cantilever. The amplitude and phase signals (or orthogonal X and Y signals) of the ac magnetic field can be obtained separately by using the FM-MFM technique incorporated with a lock-in amplifier. A signal transformation technique to characterize the AC magnetic field source for frequency modulated magnetic force microscopy was proposed. Two-dimensional vector analysis together with the magnetization vector rotation of the perpendicular recording head was demonstrated using the FM-MFM method combined with the signal transformation algorithm. By taking advantage of this technique, the present method opens a possibility to stroboscopic analyze the AC magnetic field source and gives a very useful feedback for the development of advanced magnetic recording heads. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4720508]