Observation of recorded magnetization patterns by electron holography
Observation of recorded magnetization patterns by electron holography
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通过电子全息术观察记录的磁化图案
DOI：
10.1109/tmag.1983.1062674
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发表时间：
1983
影响因子：
2.1
通讯作者：
H. Fujiwara
中科院分区：
文献类型：
--
作者：
K. Yoshida;T. Okuwaki;N. Osakabe;H. Tanabe;Y. Horiuchi;T. Matsuda;K. Shinagawa;A. Tonomura;H. Fujiwara
用电子全息技术直接观察了斜入射真空沉积Co薄膜的磁化强度。在过渡区的锯齿状壁面上观察到沿着复杂的类椭圆干涉条纹。在薄膜边缘以外的空间中观察到杂散磁通量。从这些干涉图像的分析中获得以下结果。剩磁和膜厚度的乘积越小，矫顽力越高，决定介质记录密度极限的过渡长度越窄。据证实，纵向磁记录的密度高达170 kBPI是可实现的，使用Co膜30 nm厚，并具有112 kA/m的矫顽力。定量地证明了当磁化区与过渡区可区分时，记录磁化强度等于介质的剩磁。
Magnetization patterns recorded on Co thin films prepared by oblique incidence vacuum deposition were directly observed by electron holography. Complicated ellipse-like interference fringes were observed along the sawtooth-like walls in the transition regions. Stray magnetic flux was observed in empty space beyond the edge of the film. The following results were obtained from analysis of these interference images. The smaller the product of the remanence and the film thickness, and the higher the coercivity, the narrower is the transition length that determines the limit of the recording density of a medium. It was confirmed that longitudinal magnetic recording of a density of up to 170 kBPI is attainable using Co film 30 nm thick and with coercivity of 112 kA/m. It was quantitatively proven that the intensity of the recorded magnetization in a medium is equal to its remanence when the magnetized area is distinguishable from the transition region.