电化学自组装Fe1-xCox纳米线的磁性和结构特性

Magnetic and structural properties of electrochemically self-assembled Fe1-xCox nanowires.

作者信息

Menon L, Bandyopadhyay S, Liu Y, Zeng H, Sellmyer D J

机构信息

Department of Electrical Engineering, Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0511, USA.

出版信息

J Nanosci Nanotechnol. 2001 Jun;1(2):149-52. doi: 10.1166/jnn.2001.027.

DOI:10.1166/jnn.2001.027

PMID:12914045

Abstract

Fe1-xCox (0 < or = x < or = 1) nanowires have been self-assembled by electrodeposition in porous alumina films. The crystal structure is bee at the Fe end. With increased addition of Co, the crystal structure remains bcc until about 67% addition of Co. At the Co end, the structure is a mixture of hcp and fcc. Magnetic studies show very high coercivities for the Fe-Co alloys in the bcc phase. For Fe0.67Co0.33 nanowires of diameter 9 nm, the coercivity is about 2900 Oe, whereas for Fe0.33Co0.67 nanowires, it is about 2850 Oe. Temperature and size dependence of magnetic properties show no indication of superparamagnetic effects down to wire diameters of 9 nm.

摘要

通过在多孔氧化铝膜中进行电沉积自组装得到了Fe1-xCox（0≤x≤1）纳米线。在铁端晶体结构为体心立方（bee）。随着钴添加量的增加，晶体结构在钴添加量约为67%之前一直保持体心立方（bcc）。在钴端，结构是六方密堆积（hcp）和面心立方（fcc）的混合。磁性研究表明，体心立方相的铁钴合金具有非常高的矫顽力。对于直径为9纳米的Fe0.67Co0.33纳米线，矫顽力约为2900奥斯特（Oe），而对于Fe0.33Co0.67纳米线，矫顽力约为2850奥斯特（Oe）。磁性特性的温度和尺寸依赖性表明，在直径小至9纳米的情况下，没有超顺磁效应的迹象。