电化学沉积Fe与FePd纳米线阵列的磁性

Magnetic properties of electrodeposited Fe and FePd nanowire arrays

利用电化学沉积方法在氧化铝模板中制备了一维Fe和Fe0.95Pd0.05合金纳米线阵列.两种样品均有(110)晶向择优取向,纳米线直径为60nm.在这一直径下形状各向异性和内禀晶体各向异性的竞争结果很适合考察Pd掺杂的磁性行为.研究发现在FePd纳米线中,由于极少量Pd在Fe中的合金化,减弱了晶体各向异性与形状各向异性的影响,改变了磁畴结构,增强了畴壁钉扎作用,结果在Fe0.95Pd0.05纳米线中便显示出强烈的沿线方向的各向异性,方形度和矫顽力也有较大改善.

Fe and FePd nanowires were fabricated by electrodeposition in porous anodic aluminum oxide template. Both Fe and Fe0.95 Pd0.05 nanowires have a （110） preferred orientation with a diameter of 60nm . This diameter is suitable for investigating the behavior of traced Pd in FePd nanowire. With the traced Pd alloying in Fe nanowire, the crystalline anisotropy overpowers the shape anisotropy, changing the magnetic domain structure and increasing the pinning of domain wall. Thus the Fe0.95 Pd0.05 nanowire shows a strong parallel-to-the-wire anisotropy with improved squareness and coercivity.