Institute of Applied Physics, University of Hamburg, Hamburg, Germany.
Nanotechnology. 2012 Dec 14;23(49):495718. doi: 10.1088/0957-4484/23/49/495718. Epub 2012 Nov 19.
Reversal modes and magnetostatic interactions of multilayered Fe(3)O(4)/ZrO(2)/Fe(3)O(4) nanotubes consisting of a ferromagnetic internal tube, an intermediate non-magnetic spacer and an external magnetic shell are investigated as a function of their geometric parameters and compared with those produced inside the pores of anodic alumina membranes by atomic layer deposition. Based on a continuum approach we obtained analytical expressions that underline the first experimental results and support their interpretation that the system of multilayer tubes behaves as the reversal of two isolated systems. It is observed that the magnetostatic interaction between both phases depends on the magnetic configurations in each phase and also on the geometrical parameters considered. These structures have potential applications in novel spintronics devices, ultra-small magnetic media and other nano-devices.
由铁磁内管、中间非磁间隔和外部磁壳组成的多层 Fe(3)O(4)/ZrO(2)/Fe(3)O(4) 纳米管的反转模式和静磁相互作用作为其几何参数的函数进行了研究，并与通过原子层沉积在阳极氧化铝膜的孔内产生的那些进行了比较。基于连续体方法，我们得到了解析表达式，强调了第一个实验结果，并支持其解释，即多层管系统的行为与两个孤立系统的反转相同。观察到两相之间的静磁相互作用取决于每个相中的磁构型以及所考虑的几何参数。这些结构在新型自旋电子器件、超小磁介质和其他纳米器件中有潜在的应用。
