自然科学版
陕西师范大学学报(自然科学版)
物理学与信息科学
非磁性分隔层厚度对Fe/Cu多层纳米线磁性和电子特性的影响
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王喜志1,汤振兵1,马良财1*,马玲1,张建民2
(1 宁夏大学 物理与电子电气工程学院,宁夏 银川 750021;2 陕西师范大学 物理学与信息技术学院, 陕西 西安 710119)
马良财,男,副教授,博士,硕士生导师,主要从事纳米材料特性方面的研究。E-mail: maliangcai@126.com
摘要:
基于密度泛函理论框架下的第一性原理计算,研究了非磁性分隔层厚度对Fe/Cu多层纳米线磁性和电子特性的影响。结果表明:多层纳米线的稳定性随着非磁性Cu分隔层厚度的增加而降低,其层间交换耦合随非磁性Cu分隔层厚度的增加呈现出振荡衰减的特性,且其振荡周期为两个Cu原子层。自旋极化能带结构的计算结果表明,Fe/Cu多层纳米线的电导敏感地依赖于Cu分隔层的厚度。
关键词:
多层纳米线;磁性;层间交换耦合;第一性原理
收稿日期:
2018-03-20
中图分类号:
O482.5
文献标识码:
A
文章编号:
1672-4291(2019)02-0040-06
基金项目:
国家自然科学基金(11664032,11664033)
Doi:
Influence of the thickness of nonmagnetic spacer on the magnetic and electronic properties of Fe/Cu multilayered nanowires
WANG Xizhi1, TANG Zhenbing1, MA Liangcai1*, MA Ling1, ZHANG Jianmin2
(1 School of Physics and Electronic-Electrical Engineering, Ningxia University,Yinchuan 750021, Ningxia, China;2 School of Physics and Information Technology, Shaanxi Normal University,Xi′an 710119, Shaanxi, China)
Abstract:
The influence of the thickness of nonmagnetic spacer on the magnetic and electronic properties of Fe/Cu multilayered nanowires was investigated systematically by using first-principles calculations based on the density-functional theory. It is found that the stability of both ferromagnetic and antiferromagnetic configuration Fe/Cu multilayered nanowires decreases with increasing concentration of nonmagnetic Cu layers. The calculated interlayer exchange coupling (IEC) is found to switch as the thickness of nonmagnetic Cu spacer increases in the nanowire, and the magnitude of the IEC value is found to decrease significantly with increasing the number of nonmagnetic Cu layers. The oscillation period of IEC is found to be 2 Cu spacer layers. The analysis of the spin-polarized band structures suggests a sensitive dependence of conductance upon the thickness of nonmagnetic Cu spacer.
KeyWords:
multilayered nanowires; magnetic properties; interlayer exchange coupling; first-principles