Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes
We report the facile and low-cost preparation as well as detailed characterization of dense arrays of passivated ferromagnetic nickel (Ni) nanotubes (NTs) vertically-supported onto solid Au-coated Si substrates. The proposed fabrication method relies on electrochemical synthesis within the nanopores...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/12/2444 |
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| author | Claudiu Locovei Nicolae Filipoiu Andrei Kuncser Anda-Elena Stanciu Ştefan Antohe Camelia-Florina Florica Andreea Costas Ionuţ Enculescu Luc Piraux Victor Kuncser Vlad-Andrei Antohe |
| author_facet | Claudiu Locovei Nicolae Filipoiu Andrei Kuncser Anda-Elena Stanciu Ştefan Antohe Camelia-Florina Florica Andreea Costas Ionuţ Enculescu Luc Piraux Victor Kuncser Vlad-Andrei Antohe |
| author_sort | Claudiu Locovei |
| collection | DOAJ |
| description | We report the facile and low-cost preparation as well as detailed characterization of dense arrays of passivated ferromagnetic nickel (Ni) nanotubes (NTs) vertically-supported onto solid Au-coated Si substrates. The proposed fabrication method relies on electrochemical synthesis within the nanopores of a supported anodic aluminum oxide (AAO) template and allows for fine tuning of the NTs ferromagnetic walls just by changing the cathodic reduction potential during the nanostructures’ electrochemical growth. Subsequently, the experimental platform allowed further passivation of the Ni NTs with the formation of ultra-thin antiferromagnetic layers of nickel oxide (NiO). Using adequately adapted magnetic measurements, we afterwards demonstrated that the thickness of the NT walls and of the thin antiferromagneticNiO layer, strongly influences the magnetic behavior of the dense array of exchange-coupled Ni/NiO NTs. The specific magnetic properties of these hybrid ferromagnetic/antiferromagnetic nanosystems were then correlated with the morpho-structural and geometrical parameters of the NTs, as well as ultimately strengthened by additionally-implemented micromagnetic simulations. The effect of the unidirectional anisotropy strongly amplified by the cylindrical geometry of the ferromagnetic/antiferromagnetic interfaces has been investigated with the magnetic field applied both parallel and perpendicular to the NTs axis. |
| first_indexed | 2024-03-10T14:16:15Z |
| format | Article |
| id | doaj.art-223f133db51d4579b5054daa77ea5e33 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T14:16:15Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-223f133db51d4579b5054daa77ea5e332023-11-20T23:43:26ZengMDPI AGNanomaterials2079-49912020-12-011012244410.3390/nano10122444Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel NanotubesClaudiu Locovei0Nicolae Filipoiu1Andrei Kuncser2Anda-Elena Stanciu3Ştefan Antohe4Camelia-Florina Florica5Andreea Costas6Ionuţ Enculescu7Luc Piraux8Victor Kuncser9Vlad-Andrei Antohe10National Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaFaculty of Physics, R&D Center for Materials and Electronic & Optoelectronic Devices (MDEO), University of Bucharest, Atomiştilor Street 405, 077125 Măgurele, RomaniaNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaFaculty of Physics, R&D Center for Materials and Electronic & Optoelectronic Devices (MDEO), University of Bucharest, Atomiştilor Street 405, 077125 Măgurele, RomaniaNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaInstitute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCLouvain), Place Croix du Sud 1, B-1348 Louvain-la-Neuve, BelgiumNational Institute of Materials Physics (NIMP), Atomiştilor Street 405A, 077125 Măgurele, RomaniaFaculty of Physics, R&D Center for Materials and Electronic & Optoelectronic Devices (MDEO), University of Bucharest, Atomiştilor Street 405, 077125 Măgurele, RomaniaWe report the facile and low-cost preparation as well as detailed characterization of dense arrays of passivated ferromagnetic nickel (Ni) nanotubes (NTs) vertically-supported onto solid Au-coated Si substrates. The proposed fabrication method relies on electrochemical synthesis within the nanopores of a supported anodic aluminum oxide (AAO) template and allows for fine tuning of the NTs ferromagnetic walls just by changing the cathodic reduction potential during the nanostructures’ electrochemical growth. Subsequently, the experimental platform allowed further passivation of the Ni NTs with the formation of ultra-thin antiferromagnetic layers of nickel oxide (NiO). Using adequately adapted magnetic measurements, we afterwards demonstrated that the thickness of the NT walls and of the thin antiferromagneticNiO layer, strongly influences the magnetic behavior of the dense array of exchange-coupled Ni/NiO NTs. The specific magnetic properties of these hybrid ferromagnetic/antiferromagnetic nanosystems were then correlated with the morpho-structural and geometrical parameters of the NTs, as well as ultimately strengthened by additionally-implemented micromagnetic simulations. The effect of the unidirectional anisotropy strongly amplified by the cylindrical geometry of the ferromagnetic/antiferromagnetic interfaces has been investigated with the magnetic field applied both parallel and perpendicular to the NTs axis.https://www.mdpi.com/2079-4991/10/12/2444dense arrays of vertically-aligned heterostructured nickel/nickel oxide (Ni/NiO) nanotubes (NTs)supported anodic aluminum oxide (AAO) nanoporous mediatemplate-assisted electrochemical synthesisunidirectional anisotropy in quasi one-dimensional (1D) nanostructuresexchange bias field and coercivity of cylindrical ferromagnetic/antiferromagnetic Ni/NiO interfacesmicromagnetic simulations |
| spellingShingle | Claudiu Locovei Nicolae Filipoiu Andrei Kuncser Anda-Elena Stanciu Ştefan Antohe Camelia-Florina Florica Andreea Costas Ionuţ Enculescu Luc Piraux Victor Kuncser Vlad-Andrei Antohe Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes Nanomaterials dense arrays of vertically-aligned heterostructured nickel/nickel oxide (Ni/NiO) nanotubes (NTs) supported anodic aluminum oxide (AAO) nanoporous media template-assisted electrochemical synthesis unidirectional anisotropy in quasi one-dimensional (1D) nanostructures exchange bias field and coercivity of cylindrical ferromagnetic/antiferromagnetic Ni/NiO interfaces micromagnetic simulations |
| title | Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes |
| title_full | Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes |
| title_fullStr | Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes |
| title_full_unstemmed | Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes |
| title_short | Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes |
| title_sort | unidirectional magnetic anisotropy in dense vertically standing arrays of passivated nickel nanotubes |
| topic | dense arrays of vertically-aligned heterostructured nickel/nickel oxide (Ni/NiO) nanotubes (NTs) supported anodic aluminum oxide (AAO) nanoporous media template-assisted electrochemical synthesis unidirectional anisotropy in quasi one-dimensional (1D) nanostructures exchange bias field and coercivity of cylindrical ferromagnetic/antiferromagnetic Ni/NiO interfaces micromagnetic simulations |
| url | https://www.mdpi.com/2079-4991/10/12/2444 |
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