Nucleation and propagation of domains walls in a Co∕Pt multilayer wire
Nucleation and propagation of domains walls in a Co∕Pt multilayer wire
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Co∕Pt 多层线中畴壁的成核和扩展
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Williams
中科院分区：
文献类型：
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作者：
L. S. E. Alvarez;G. Burnell;C. Marrows;Kaiyou Wang;A. Blackburn;D. Williams
用克尔显微镜和异常霍尔效应测量研究了具有垂直磁各向异性的Co/Pt多层膜形成的霍尔棒器件中的畴壁过程。样品非常薄(~lt；2 nm)，因此它们表现出全剩磁和正方形磁滞回线，矫顽场为∼25Oe。克尔显微镜观察到的原始图案化的霍尔棒已经显示出不受控制的磁区壁成核，随后是快速的扩展，没有明显的钉扎。这表明成核场超过了这些样品中的任何传播场和钉扎场。用不同剂量的Ga~+离子辐照Co/Pt多层膜结构的选定区域，研究了受控磁区的磁化成核，证明了这种辐照区域相对于样品的其余部分具有降低的矫顽力。这种方法可以将成核场降低到样品中存在的任何钉扎场以下，从而能够控制壁面的定位。
The domain wall processes in Hall bar devices patterned from Co∕Pt multilayers with perpendicular magnetic anisotropy have been studied by Kerr microscopy and extraordinary Hall effect measurements. The samples are extremely thin (<2nm) so that they show full remanence and a square hysteresis loop with a coercive field of ∼25Oe. The Kerr microscope observations of the as-patterned Hall bars have shown an uncontrolled domain wall nucleation followed by rapid propagation, without significant pinning. This shows that the nucleation field exceeds any propagation and pinning fields in these samples. Controlled domain wall nucleation by irradiation of a selected area of the Co∕Pt multilayer structure with different doses of Ga+ ions on the multilayers has been studied proving the decrease of coercivity in such irradiated areas with respect to the rest of the sample. This method can be used to lower the nucleation field below any pinning fields that exist in the sample, enabling controlled wall positioning withi...