Finite size effects in patterned magnetic permalloy films
Finite size effects in patterned magnetic permalloy films
复制标题
图案化磁性坡莫合金薄膜中的有限尺寸效应
DOI：
10.1063/1.372473
复制
发表时间：
2000
影响因子：
3.2
通讯作者：
R. Gomez
中科院分区：
文献类型：
--
作者：
G. Gubbiotti;L. Albini;G. Carlotti;M. Crescenzi;E. Fabrizio;A. Gerardino;O. Donzelli;F. Nizzoli;H. Koo;R. Gomez
用电子束曝光法制备了宽度和间距在1~4μm之间的250A厚的方形坡莫合金点，用磁光克尔效应、磁力显微镜和布里渊光散射等辅助技术研究了这些结构的静态和动态磁性能。纵向MOKE能够比较不同网点大小和网点间距的样品的磁滞回线，表明网点内部的退磁场对磁滞回线有显著的影响。在零场下记录的MFM图像显示，根据点间距的不同，存在四或七域图案的流行，以及少数具有净磁矩的非螺线管图案。然后用来自热激活的自旋波的BLS确定了坡莫合金薄膜的本征磁性参数，并证明了由于热激活自旋波而产生的自旋波峰的离散化。
Electron beam lithography has been used to prepare 250-A-thick square-shaped permalloy dots whose width and separation are in the range between 1 and 4 μm. The static and dynamic magnetic properties of these structures have been investigated by complementary techniques such as magneto-optic Kerr effect (MOKE), magnetic force microscopy (MFM), and Brillouin light scattering (BLS). Longitudinal MOKE enabled us to compare the hysteresis loops of the specimens with different dot size and interdot separation, showing a marked influence of the demagnetizing field inside the dots. MFM images recorded at zero applied field showed that, depending on the interdot spacing, there is a prevalence of either four- or seven-domain patterns together with a minority of nonsolenoidal patterns that possess a net magnetic moment. BLS from thermally activated spin waves were then used to determine the intrinsic magnetic parameters of the permalloy films and to show evidence of the discretization of the spin-wave peak due to th...