Magnetic properties of electrodeposited nanowires

被引:55
作者
Heydon, GP [1 ]
Hoon, SR [1 ]
Farley, AN [1 ]
Tomlinson, SL [1 ]
Valera, MS [1 ]
Attenborough, K [1 ]
Schwarzacher, W [1 ]
机构
[1] UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND
关键词
D O I
10.1088/0022-3727/30/7/004
中图分类号
O59 [应用物理学];
学科分类号
摘要
Electrodeposited multilayered nanowires grown within a polycarbonate membrane constitute a new medium in which giant magnetoresistance (GMR) perpendicular to the plane of the multilayers can be measured. These structures can exhibit a perpendicular GMR of at least 22% at ambient temperature. We performed detailed studies both of reversible magnetization and of irreversible remanent magnetization curves for CoNiCu/Cu/CoNiCu multilayered and CoNiCu pulse-deposited nanowire systems with Co:Ni ratios of 6:4 and 7:3 respectively in the range 10-290 K, allowing the magnetic phases of these structures to be identified. Shape anisotropy in the pulse-deposited nanowire and inter-layer coupling in the multilayered nanowire are shown to make important contributions to the magnetic properties. Dipolar-like interactions are found to predominate in both nanowire systems. Magnetic force microscope (MFM) images of individual multilayered nanowires exhibit a contrast consistent with there being a soft magnetization parallel to the layers. Switching of the magnetic layers in the multilayered structure into the direction of the MFM tip's stray field is observed.
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收藏
页码:1083 / 1093
页数:11
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