Electrochemical synthesis of magnetic nanowires with controlled geometry and magnetic anisotropy

Prida, V.M.; Garcı́a, J.A.; Hernando, B.; Bran, Cristina; Vivas, L. G.; Vázquez, M.

doi:10.1016/b978-0-08-100164-6.00002-3

Cited by 19 publications

(16 citation statements)

References 196 publications

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“…Moreover, shape-related effects make them of potential interest in technological and biomedical applications (spintronics, sensors, solar cells, field effect transistors, for drug and gene delivery, among others) [1][2][3][4][5]. The two main techniques for nanowire fabrication are lithography [6] and electrodeposition [7]. There are many reports in the literature related to the synthesis of nanowire arrays based on transition metals alloys [8,9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

et al. 2017

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A straightforward method for the synthesis of CoFe/CoFeO core/shell nanowires is described. The proposed method starts with a conventional pulsed electrodeposition procedure on alumina nanoporous template. The obtained CoFe nanowires are released from the template and allowed to oxidize at room conditions over several weeks. The effects of partial oxidation on the structural and magnetic properties were studied by x-ray spectrometry, magnetometry, and scanning and transmission electron microscopy. The results indicate that the final nanowires are composed of 5 nm iron-cobalt alloy nanoparticles. Releasing the nanowires at room conditions promoted surface oxidation of the nanoparticles and created a CoFeO shell spinel-like structure. The shell avoids internal oxidation and promotes the formation of bi-magnetic soft/hard magnetic core/shell nanowires. The magnetic properties of both the initial single-phase CoFe nanowires and the final core/shell nanowires, reveal that the changes in the properties from the array are due to the oxidation more than effects associated with released processes (disorder and agglomeration).

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Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

et al. 2017

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“…Then, it is a challenge to measure and define the main parameters that represent the population of the fabricated nanostructures. In this context, self-ordered porous Anodic Aluminum Oxide membranes (AAOs) when used as templates, have been established as a large scale, suitable and low cost fabrication technique of a wide range of nanomaterials such as antidot thin films, nanotubes and nanowires, among others [ 1 , 2 , 3 , 4 ]. When the pores of the AAO membranes are filled with a metallic material by means of electrodeposition techniques, the deposited material reproduces the pore shape, thus forming a self-ordered nanowire array [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…The latter application has been a subject of extensive study and requires the control of magnetic domain walls and magnetization reversal processes of the nanomaterial. With this purpose, heterogeneous ferromagnetic nanowires are being fabricated by modulating their shape, changing their diameter, and/or their composition, performing multi-segments and multi-layers [ 4 , 8 , 9 , 10 , 11 , 12 ]. Nevertheless, due to the low dimensions of the nanowires, their magnetic characterization is frequently performed when nanowires remain embedded into the pores of the alumina membrane, in order to have enough signal when many nanowires contribute to the total magnetization of the sample.…”

Section: Introductionmentioning

confidence: 99%

Two-Step Magnetization Reversal FORC Fingerprint of Coupled Bi-Segmented Ni/Co Magnetic Nanowire Arrays

et al. 2018

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First Order Reversal Curve (FORC) analysis has been established as an appropriate method to investigate the magnetic interactions among complex ferromagnetic nanostructures. In this work, the magnetization reversal mechanism of bi-segmented nanowires composed by long Co and Ni segments contacted at one side was investigated, as a model system to identify and understand the FORC fingerprint of a two-step magnetization reversal process. The resulting hysteresis loop of the bi-segmented nanowire array exhibits a completely different magnetic behavior than the one expected for the magnetization reversal process corresponding to each respective Co and Ni nanowire arrays, individually. Based on the FORC analysis, two possible magnetization reversal processes can be distinguished as a consequence of the ferromagnetic coupling at the interface between the Ni and Co segments. Depending on the relative difference between the magnetization switching fields of each segment, the softer magnetic phase induces the switching of the harder one through the injection and propagation of a magnetic domain wall when both switching fields are comparable. On the other hand, if the switching fields values differ enough, the antiparallel magnetic configuration of nanowires is also possible but energetically unfavorable, thus resulting in an unstable magnetic configuration. Making use of the different temperature dependence of the magnetic properties for each nanowire segment with different composition, one of the two types of magnetization reversal is favored, as demonstrated by FORC analyses.

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“…In addition, advanced anodization protocols, including hard anodization [12,13], pulsed or sequential anodization [14], or lithography-guided anodization [15] allowed recently to obtain ideally ordered nanoporous templates, exhibiting also pore diameter * corresponding author; e-mail: vmpp@uniovi.es modulations [16,17]. The spatial and periodic pores arrangement of the AAO templates, together with the confined growth of the magnetic material at the nanoscale deposited in the nanoporous alumina template, translate into the appearing of cooperative phenomena in the nanostructured materials, which in turn lead to tailor novel functional properties that differ from that of 3D bulk and 2D thin film systems [18,19].…”

Section: Introductionmentioning

confidence: 99%

Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

et al. 2017

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The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.

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Electrochemical synthesis of magnetic nanowires with controlled geometry and magnetic anisotropy

Cited by 19 publications

References 196 publications

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires

Two-Step Magnetization Reversal FORC Fingerprint of Coupled Bi-Segmented Ni/Co Magnetic Nanowire Arrays

Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

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