Research Article

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2018, 11(7): 3519–3528

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https://doi.org/10.1007/s12274-017-1793-y

Ultra-dense planar metallic nanowire arrays with extremely large anisotropic optical and magnetic properties

Qi Jia1,2,4, Xin Ou1,2 (*), Manuel Langer1, Benjamin Schreiber1, Jrg Grenzer1, Pablo F. Siles3, Raul D. Rodriguez3,5, Kai Huang1,2,4, Ye Yuan1, Alireza Heidarian1, Ren Hbner1, Tiangui You2, Wenjie Yu2, Kilian Lenz1, Jrgen Lindner1, Xi Wang2, and Stefan Facsko1

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1 Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstr. 400, 01328 Dresden, Germany
2 State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
3 Technische Universitt Chemnitz, Reichenhainerstrae 70, 09107 Chemnitz, Germany
4 University of Chinese Academy of Sciences, Beijing 100049, China
5 Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia

Keywords: self-assembly, metallic nanowire array, reverse epitaxy, magnetic anisotropy, anisotropic dielectric function
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ABSTRACT A nanofabrication method for the production of ultra-dense planar metallic nanowire arrays scalable to wafer-size is presented. The method is based on an efficient template deposition process to grow diverse metallic nanowire arrays with extreme regularity in only two steps. First, III-V semiconductor substrates are irradiated by a low-energy ion beam at an elevated temperature, forming a highly ordered nanogroove pattern by a “reverse epitaxy” process due to self-assembly of surface vacancies. Second, diverse metallic nanowire arrays (Au, Fe, Ni, Co, FeAl alloy) are fabricated on these III-V templates by deposition at a glancing incidence angle. This method allows for the fabrication of metallic nanowire arrays with periodicities down to 45 nm scaled up to wafer-size fabrication. As typical noble and magnetic metals, the Au and Fe nanowire arrays produced here exhibited large anisotropic optical and magnetic properties, respectively. The excitation of localized surface plasmon resonances (LSPRs) of the Au nanowire arrays resulted in a high electric field enhancement, which was used to detect phthalocyanine (CoPc) in surface-enhanced Raman scattering (SERS). Furthermore, the Fe nanowire arrays showed a very high in-plane magnetic anisotropy of approximately 412 mT, which may be the largest in-plane magnetic anisotropy field yet reported that is solely induced via shape anisotropy within the plane of a thin film.
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Ultra-dense planar metallic nanowire arrays with extremely large anisotropic optical and magnetic properties. Nano Res. 2018, 11(7): 3519–3528 https://doi.org/10.1007/s12274-017-1793-y

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