The Magnetic Properties of Fe/Cu Multilayered Nanowires: The Role of the Number of Fe Layers and Their Thickness

被引:14
|
作者
Caspani, Sofia [1 ,2 ]
Moraes, Suellen [1 ,2 ]
Navas, David [3 ]
Proenca, Mariana P. [1 ,2 ,4 ,5 ]
Magalhaes, Ricardo [1 ,2 ]
Nunes, Claudia [6 ]
Araujo, Joao Pedro [1 ,2 ]
Sousa, Celia T. [1 ,2 ]
机构
[1] Univ Porto, IFIMUP, Fac Ciencias, Rua Campo Alegre 687, P-4169007 Porto, Portugal
[2] Univ Porto, Dept Fis & Astron, Fac Ciencias, Rua Campo Alegre 687, P-4169007 Porto, Portugal
[3] Inst Ciencia Mat Madrid, ICMM CSIC, Sor Juana Ines de la Cruz 3, Madrid 28049, Spain
[4] Univ Politecn Madrid, ISOM, Avda Complutense 30, Madrid 28040, Spain
[5] Univ Politecn Madrid, Dept Elect Fis, Avda Complutense 30, Madrid 28040, Spain
[6] Univ Porto, REQUIMTE, LAQV, Fac Pharm, P-4050313 Porto, Portugal
基金
欧盟地平线“2020”;
关键词
nanowires; porous anodic alumina membranes; Fe/Cu bilayers; magnetization reversal; ELECTROCHEMICAL NUCLEATION; NI/CU NANOWIRES; ARRAYS; FABRICATION; DEPOSITION; BEHAVIOR; ELECTRODEPOSITION; REVERSAL; GROWTH;
D O I
10.3390/nano11102729
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Multi-segmented bilayered Fe/Cu nanowires have been fabricated through the electrodeposition in porous anodic alumina membranes. We have assessed, with the support of micromagnetic simulations, the dependence of fabricated nanostructures' magnetic properties either on the number of Fe/Cu bilayers or on the length of the magnetic layers, by fixing both the nonmagnetic segment length and the wire diameter. The magnetic reversal, in the segmented Fe nanowires (NWs) with a 300 nm length, occurs through the nucleation and propagation of a vortex domain wall (V-DW) from the extremities of each segment. By increasing the number of bilayers, the coercive field progressively increases due to the small magnetostatic coupling between Fe segments, but the coercivity found in an Fe continuous nanowire is not reached, since the interactions between layers is limited by the Cu separation. On the other hand, Fe segments 30 nm in length have exhibited a vortex configuration, with around 60% of the magnetization pointing parallel to the wires' long axis, which is equivalent to an isolated Fe nanodisc. By increasing the Fe segment length, a magnetic reversal occurred through the nucleation and propagation of a V-DW from the extremities of each segment, similar to what happens in a long cylindrical Fe nanowire. The particular case of the Fe/Cu bilayered nanowires with Fe segments 20 nm in length revealed a magnetization oriented in opposite directions, forming a synthetic antiferromagnetic system with coercivity and remanence values close to zero.
引用
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页数:12
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