Fe_(100-x)Pd_x合金纳米线阵列的制备及其磁性研究

Fabrication and magnetic properties of Fe_(100-x)Pd_x nanowire arrays

利用直流电沉积法在多孔阳极氧化铝模板中制备出了一系列Fe100-xPdx磁性纳米线阵列.Pd的增加使纳米线的总体磁性降低,各向异性和矫顽力也发生了较大的变化.当Pd含量高达x=30时,纳米线仍有相当高的矫顽力(7·48kA/m)和较明显的各向异性,但当Pd的含量增加到50%时,纳米线的易磁化方向由平行线的方向反转到垂直线的方向.实验证明,这是由于在Fe80Pd20和Fe70Pd30中连续的磁性相在Fe50Pd50纳米线中变成了与非磁性相相互间隔的非连续片状结构.片状磁性相的形状各向异性使易磁化方向转变到垂直纳米线轴的方向.从生长动力学的角度对Fe50Pd50纳米线中这种片状的形成进行了解释.

Fe100-x Pdx nanowire arrays with different compositions have been fabricated in anodic aluminum oxide templates by electrodeposition. Around x = 30, the nanowire arrays still show rather high coercivity （7.48 kA/m） and axial anisotropy. But increasing the Pd content to x = 50, the magnetization easy axis is tuned to be perpendicular to the nanowires. It is attributed to the discontinuous magnetic layer being separated by non-ferromagnetic sheets grown in the Fe50 Pd50 nanowires, such that the shape anisotropy overturns the easy axis. The formation of the laminated structure in Fe50 Pd50 nanowires has been discussed based on the growth kinetics.