以掃描探針顯微鏡掃描高深寬比元件時，容易造成影像失真，甚至發生破壞樣品及探針的情況。在本文中，我們利用填充光阻輔助平坦化的方式，在不影響原本的磁性薄膜結構下，大幅降低高深寬比磁性奈米管與周遭的高低差，並成功擷取管端表面的磁力顯微影像。由於此結構為三維的磁性元件，因此在其翻轉過程中，管端表面之暫穩態不同於薄磁性環的典型漩渦態，而是兩組頭對頭與尾對尾的垂直磁區壁結構。模擬的磁區動態翻轉與磁力顯微儀的實驗結果相吻合。

When the high aspect ratio of magnetic nano-cylinder structures are probed by magnetic force microscopy (MFM),the distorted images are often observed and yet the samples/tips are easily destructed mutually. In order to solve this problem, we report a technique of planarizing magnetic nano-cylinder array by spin-coating photoresist. The height difference of the nano-cylinder from the surrounding is greatly reduced and the corresponding magnetic images are successfully obtained. Due to the nature of a three-dimensional magnetic confi guration, it is obviously found that the intermediate state of the top end reveals two head-to-head and tail-to-tail transverse domain walls rather than a typical fl ux-closure vortex state in thin magnetic rings. The experimental results are well fi tted with numerical simulations.