Direct writing of CoFe alloy nanostructures by focused electron beam induced deposition from a heteronuclear precursor
Direct writing of CoFe alloy nanostructures by focused electron beam induced deposition from a heteronuclear precursor
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DOI：
10.1088/0957-4484/26/47/475701
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发表时间：
2015-11-27
期刊：
影响因子：
3.5
通讯作者：
Huth, M.
中科院分区：
文献类型：
--
作者：
Porrati, F.;Pohlit, M.;Huth, M.
最近，聚焦电子束诱导沉积已被用于通过使用 Fe(CO)(5) 或 Co-2(CO)(8) 等同核前体气体来制备在纳米磁逻辑和传感应用中具有潜力的功能性磁性纳米结构。在这里，我们表明，通过使用单源异核前体气体，可以扩展到双金属化合物的制造。我们从 HFeCo3(CO)(12) 金属羰基前体中生长出 CoFe 合金磁性纳米结构。成分分析表明样品含有约80.at%的金属和10.at%的碳和氧。对宽度低至 50 nm 的各种尺寸的纳米线进行了四探针磁传输测量，发现其室温电阻率为 43 μΩ·cm。微霍尔磁力测量显示，该材料的 50 nm x 250 nm 纳米棒在最高测量温度 250 K 下仍具有铁磁性。最后，透射电子显微镜 (TEM) 微观结构研究表明，沉积物由 bcc Co-Fe 相与 FeCo2 O-4 尖晶石氧化物相混合组成，纳米颗粒直径约为 5 nm。
Recently, focused electron beam-induced deposition has been employed to prepare functional magnetic nanostructures with potential in nanomagnetic logic and sensing applications by using homonuclear precursor gases like Fe(CO)(5) or Co-2(CO)(8). Here we show that an extension towards the fabrication of bi-metallic compounds is possible by using a single-source heteronuclear precursor gas. We have grown CoFe alloy magnetic nanostructures from the HFeCo3(CO)(12) metal carbonyl precursor. The compositional analysis indicates that the samples contain about 80. at% of metal and 10. at% of carbon and oxygen. Four-probe magnetotransport measurements are carried out on nanowires of various sizes down to a width of 50 nm, for which a room temperature resistivity of 43 mu Omega cm is found. Micro-Hall magnetometry reveals that 50 nm x 250 nm nanobars of the material are ferromagnetic up to the highest measured temperature of 250 K. Finally, the transmission electron microscopy (TEM) microstructural investigation shows that the deposits consist of a bcc Co-Fe phase mixed with a FeCo2 O-4 spinel oxide phase with nanograins of about 5 nm diameter.