Permalloy (Ni/sub 80/Fe/sub 20/) squares (30 nm thick and w /spl mu/m wide; 1/spl les/w/spl les/200 /spl mu/m) and circular disks (30 nm thick and r /spl mu/m diameter; 1/spl les/r/spl les/200 /spl mu/m) prepared on a GaAs(100) substrate were observed in both their demagnetized and remanent states by magnetic force microscopy (MFM) associated with non-contact atomic force microscopy (NC-AFM). The squares (2/spl les/w /spl mu/m) exhibited conventional closure domains and the corner plays a very important role in creating new walls. The circular disks, on the other hand, formed either vortex domain (5/spl les/r/spl les/20 /spl mu/m) or multi-domain (50/spl les/r /spl mu/m) states. The magnetization rotation is observed by MFM to change according to the size and shape of the elements. The MFM observations are supported by micromagnetic calculations which confirm the effect of the corner on the domain wall formation.
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机译：坡莫合金（Ni / sub 80 / Fe / sub 20 /）方格（30 nm厚，w / spl mu / m宽; 1 / spl les / w / spl les / 200 / spl mu / m）和圆盘（30 nm通过磁力显微镜（MFM）观察了在GaAs（100）衬底上制备的厚和r / spl mu / m直径; 1 / spl les / r / spl les / 200 / spl mu / m）的退磁状态和剩磁状态）与非接触式原子力显微镜（NC-AFM）相关联。正方形（2 / spl les / w / spl mu / m）表现出常规的封闭区域，拐角在创建新墙时起着非常重要的作用。另一方面，圆盘形成涡旋域（5 / spl les / r / spl les / 20 / spl mu / m）或多域（50 / spl les / r / spl mu / m）状态。 MFM观察到磁化旋转会根据元素的大小和形状而变化。 MFM观测得到微磁计算的支持，这些计算证实了拐角对畴壁形成的影响。
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