Structure and magnetic properties of Fe-Co nanowires in self-assembled arrays

Zhan, Qingfeng; Chen, Ziyu; Xue, Desheng; Li, Fashen; Kunkel, H. P.; Zhou, Xuezhi; Roshko, R. M.; Williams, Gwyn

doi:10.1103/physrevb.66.134436

Cited by 96 publications

(85 citation statements)

References 19 publications

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“…11 Particularly, high values of coercivity and remanence have been measured when the magnetic field is applied parallel to the nanowires and have been attributed mainly to the magnetic shape anisotropy. 12,13 The aim of this investigation was to find the conditions under which enhanced magnetic hardening of FeCo nanowires was achieved with a final objective to search for their potential applications in novel family of rare-earth free permanent magnets. In this paper, we report on tailoring of the magnetic properties (i.e., coercivity and remanence) in arrays of FeCoCu magnetic nanowires by suitable thermal treatments as well as by adjusting the nanowires diameters.…”

Section: Introductionmentioning

confidence: 99%

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Bran

Ivanov

Garcı́a

et al. 2013

Journal of Applied Physics

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Arrays of hexagonally ordered Fe 28 Co 67 Cu 5 nanowires with tailored diameter from 18 to 27 nm were prepared by electroplating into anodic alumina templates and annealed in the temperature range of 300-600 C, preserving but refining their bcc crystal structure. Despite the partial reduction of saturation magnetization and corresponding shape anisotropy after annealing at 500 C, larger coercivity, 0.36 T, and squareness ratio, M r /M s ¼ 0.98, were obtained. This unexpected behavior is interpreted through micromagnetic simulations where the magnetic hardening is associated with the transition from vortex to transverse domain-wall reversal modes connected with the reduction of saturation magnetization. Simulations also predict a significant coercivity increase with decreasing nanowires diameter which agrees with experimental data in the overlapping diameter range. V C 2013 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Bran

Ivanov

Garcı́a

et al. 2013

Journal of Applied Physics

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“…[46][47][48][49] Although many investigations have focused on singleelement, binary and ternary alloy magnetic nanowires such as Ni, Co, Fe-Co, Co-Ni, Ni-Fe and Fe-Co-Ni, [50][51][52][53][54][55][56] no reports of electrodeposited Co-W alloy nanowires exists, except those by the coauthors here. In previous work, Co-W and Co-W-P nanowires and nanotubes were fabricated through the use of pulse deposition using nanoporous alumina templates from ammonia-citrate electrolytes 57 and from ammonia-free electrolytes containing citrate and boric acid.…”

mentioning

confidence: 87%

A Hybrid Approach to Fabricated Nanowire-Nanoparticle Composites of a Co-W Alloy and Au Nanoparticles

Vernickaite

Bubniene

Cesiulis

et al. 2016

J. Electrochem. Soc.

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Co-W nanowires were fabricated by pulsed electrodeposition from a citrate-glycine electrolyte onto rotating cylinder electrodes and into nanoporous polycarbonate membranes. The characterization of the electrodeposition conditions and alloy composition of electrodeposited Co-W alloy thin films were determined and used to guide conditions to electrodeposit the nanowires. Gold nanoparticles of 50 nm size were also added to the electrolyte and deposited during electrodeposition of the Co-W alloy nanowires, embedded within, and attached to the nanowire tip, introducing a novel procedure to attached nanoparticles onto nanowires. Nano-electrodes can be used for various sensing applications, and they can be easily integrated in micro-and nano-scale devices.1 The sensitivity of nano-electrodes depends on the diameter of electrode tip, and the highest sensitivity is observed by most electrochemical methods if the diameter of the working electrode tip is on the same order of the molecular species being detected. To this end, nano-gaping technology has been applied for the fabrication of nano-electrodes that are based on FIB and E-beam lithographic approaches, 2,3 including electrodeposition and/or chemical etching techniques. Gold-based 1D nanostructures (e.g., nanowires, gold nanoparticles) have been recognized as unique materials for electrical and optical sensing applications.5 Gold nanowires can provide high current densities, high signal to noise ratio and low double layer capacitance, 6 while surface plasmon resonance, often exploited with nanoparticles, can uniquely probe interactions of molecules at chemical surfaces and provide label-free bio detection. 5-8Gold nanoparticles (AuNPs) are excellent materials for functionalizing electrode surfaces.9,10 Functionalization can be achieved via the use of bi-functional chemical linking agents, mixing with the components of composite electrodes, covalent binding and others. Notably, gold nanoparticles alone have limited applications in sensing unless surface modification is performed. Careful selection and design of ligands strongly influence the sensitivity and selectivity of a sensor. 5,11 Gold nanoparticles can be synthesized by a citrate reduction method pioneered by Turkevich 12 and later advanced by Frens, 13 with a variety of modification's methods. 6,[14][15][16][17][18] The nanoparticle morphology is dependent upon chemical nanoparticle synthesis methods.Linking agents are typically applied in order to bind gold nanoparticles to surfaces of various substrates. 7,14,[19][20][21][22][23] Surface chemical modification and functionalization using linkers both are attractive methodologies because of highly active and selective layer formation, strong electrode intersectional binding, and changeable physical properties. However, there are a few important disadvantages if linkers are applied in order to design nano-electrodes: additional materials affect surface conductivity and can reduce it or lead to poor electrical contact, and they can shorten an electrode's applica...

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“…The fabrication of such nanowires in anodic alumina membranes have been widely studied during the last 15 years. 3 FeCo alloy is an outstanding soft ferromagnetic material. It exhibits numerous solitary properties which include large permeability, high Curie temperature, high saturation magnetization (Ms), low coercivity (Hc) and low magneto-crystalline anisotropy.…”

Section: Introductionmentioning

confidence: 99%

One dimensional FexCo1-x nanowires; ferromagnetic resonance and magnetization dynamics

et al. 2017

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Soft magnetic nanowires (NWs) are widely used for microwave and mm-wave components. The investigation of magnetization damping behavior of NWs have attracted great interest due to large influence of loss to the device, like integrated microwave device, magnetic sensors, and magnetic random access memory. With increasing operational frequency and degree of integration, the requirements to characterize 1-dimensional NWs become increasingly high. The purpose of this work is to study the magnetization dynamics in FexCo1-x NWs. A series of FexCo1-x (x=0, 0.25, 0.5, 0.75, 1) NWs were grown by controlled electro-deposition. By adjusting FexCo1-x concentration (x=0 to 1), the saturation magnetization, increased more than 20%. Ferromagnetic resonance (FMR) both in field and frequency sweep mode are employed to characterize the NWs in flip-chip geometry. It is observed that FMR field (Hr) increases with increase in applied frequency. At a fixed frequency, Fe NWs resonate at a lower field than the Co substituted NWs. FMR field linewidth (ΔH) as well as frequency width (Δf) are largest for Co NWs and decreased for Fe NWs. Whereas ΔH and Δf decreased further for FexCo1-x nanowires with increasing x.

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Structure and magnetic properties of Fe-Co nanowires in self-assembled arrays

Cited by 96 publications

References 19 publications

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

A Hybrid Approach to Fabricated Nanowire-Nanoparticle Composites of a Co-W Alloy and Au Nanoparticles

One dimensional FexCo1-x nanowires; ferromagnetic resonance and magnetization dynamics

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