Palmero Ester M, Bran Cristina, Del Real Rafael P, Vázquez Manuel
Institute of Materials Science of Madrid, CSIC, 28049 Madrid, Spain.
Nanotechnology. 2015 Nov 20;26(46):461001. doi: 10.1088/0957-4484/26/46/461001. Epub 2015 Oct 26.
Control over the magnetization reversal process of nanowires is essential to current advances in modern spintronic media and magnetic data storage. Much effort has been devoted to permalloy nanostrips with rectangular cross section and vanishing crystalline anisotropy. Our aim was to unveil and control the reversal process in FeCoCu nanowires with significant anisotropy and circular cross section with tailored periodical modulations in diameter. Magneto-optical Kerr effect measurements and their angular dependence performed on individual nanowires together with their analysis allow us to conclude that the demagnetization process takes place due to the propagation of a single vortex domain wall which is eventually pinned at given modulations with slightly higher energy barrier. In addition these results create new expectations for further controlling of the propagation of single and multiple domain walls.
控制纳米线的磁化反转过程对于现代自旋电子介质和磁数据存储的当前进展至关重要。人们已经在具有矩形横截面和消失的晶体各向异性的坡莫合金纳米条上投入了大量精力。我们的目标是揭示并控制具有显著各向异性和圆形横截面且直径具有定制周期性调制的FeCoCu纳米线中的反转过程。对单个纳米线进行的磁光克尔效应测量及其角度依赖性以及对它们的分析使我们能够得出结论，退磁过程是由于单个涡旋畴壁的传播而发生的，该涡旋畴壁最终在具有稍高能量势垒的给定调制处被钉扎。此外，这些结果为进一步控制单畴壁和多畴壁的传播带来了新的期望。
