Fabrication and magnetic properties of Fe3Co7 alloy nanowire arrays

Yang, Wei; Cui, Chunxiang; Sun, Ji-Bing; Wang, Baoli

doi:10.1007/s10853-009-4116-1

Cited by 15 publications

(11 citation statements)

References 16 publications

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“…Notably, these results suggest that upon exfoliation into ultrathin nanowires, CrSbSe 3 transitions from a soft to a hard ferromagnet. Similar transitions have been observed for other low-dimensional magnetic systems and are often assigned to increasing anisotropy. − In bulk CrSbSe 3 , although the spins prefer to align along the a axis, the magnetocrystalline anisotropy is relatively weak, as manifested by the low coercivity and low remanence. However, exfoliation into nanowires greatly changes the aspect ratio whereby the wire dimension along the crystallographic b direction is much longer than along a and c , giving rise to strong shape anisotropy.…”

Section: Results and Discussionsupporting

confidence: 60%

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Arguilla

Zhang

et al. 2021

J. Am. Chem. Soc.

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Driven by numerous discoveries of novel physical properties and integration into functional devices, interest in onedimensional (1D) magnetic nanostructures has grown tremendously. Traditionally, such structures are accessed with bottom-up techniques, but these require increasing sophistication to allow precise control over crystallinity, branching, aspect ratio, and surface termination, especially when approaching the subnanometer regime in magnetic phases. Here, we show that mechanical exfoliation of bulk quasi-one-dimensional crystals, a method similar to those popularized for two-dimensional van der Waals (vdW) lattices, serves as an efficient top-down method to produce ultrathin freestanding nanowires that are both magnetic and semiconducting. We use CrSbSe 3 as a representative quasi-1D vdW crystal with strong magnetocrystalline anisotropy and show that it can be exfoliated into nanowires with an average cross-section of 10 ± 2.8 nm. The CrSbSe 3 nanowires display reduced Curie−Weiss temperature but higher coercivity and remanence than the bulk phase. The methodology developed here for CrSbSe 3 , a representative for a vast class of 1D vdW lattices, serves as a blueprint for investigating confinement effects for 1D materials and accessing functional nanowires that are difficult to produce via traditional bottom-up methods.

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Section: Results and Discussionsupporting

confidence: 60%

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Arguilla

Zhang

et al. 2021

J. Am. Chem. Soc.

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“…Similar behavior, as a function of wires dimensions, was observed for other CoFe nanowire arrays. [15][16][17][18][19][20][21][22][23][24][25][26][27] …”

Section: Controlled Electrodeposition Of Comentioning

confidence: 99%

“…14 In the last decade, methods of electrodeposition, as well as the structural and magnetic properties of CoFe nanowire arrays have been extensively investigatied, [15][16][17][18][19][20][21][22][23][24][25][26][27] since CoFe materials have high * Electrochemical Society Member. z E-mail: tabakovicibro@gmail.com saturation magnetization, low coercivity and high magnetic shape anisotropy.…”

mentioning

confidence: 99%

Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization

Ghemes

Dragos-Pinzaru

Chiriac

et al. 2016

J. Electrochem. Soc.

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Among all transition metals magnetic alloys, Co 35 Fe 65 possesses the highest saturation magnetization B S = 2.45 T at room temperature given by the so-called "Slater-Pauling limit". For controlled electrodeposition of Co 35 Fe 65 nanowire arrays the following parameters were found to be optimal: electrolyte solution with 1-2 mM malonic acid (MA), ionic ratio Fe +2 /Co +2 = 2.0, growth rate, and pulsed potential deposition with time-on (2.5 s) at the potential of −1.15 V/SCE and time-off (1.0 s) at −0.70 V/SCE. These arrays were deposited inside anodic aluminum oxide (AAO) templates that contained columnar nanopores with diameters either 35 or 200 nm. Cyclic voltammetry was used in solution with and without MA and reaction mechanism was proposed to explain the critical role of MA in electrodeposition of CoFe alloys. In addition to uniform deposition of stechiometric Co 35 Fe 65 alloys, a selectivity ratio, (SR) ∼1.0, were achieved, which means that the atomic ratio of Fe/Co in the nanowire matched the molar ratio of Fe +2 /Co +2 in the electrolyte. The magnetic behavior of the subsequent 2.45 T Co 35 Fe 65 nanowire arrays showed that the shape and magnetostatic anisotropies dominated the effective anisotropy, and the impact of magnetocrystalline and magnetelastic anisotropies field was very small. 1 The highest saturation magnetization of all transition-metal (TM) alloys at room temperature shows Co 36 Fe 65 alloy with respective saturation magnetization of B s = 2.45 T, which is commonly referred to us as the "Slater-Pauling limit".2 Thin films of these alloys, obtained either by electrochemical deposition (ED) or called sputter deposition, are currently used in high areal recording density (HRD) heads including longitudinal (LMR), perpendicular (PMR), and heat assisted (HAMR) magnetic recording. In fact, about 15 years ago Seagate Technologies was first in the recording head industry to introduce 2.4 T CoFe as the longitudinal writer pole material-which was fabricated by electrodeposition. 3 The advantages of electrochemical vs. sputtering deposition include reduced process content, reduced variance and reduced cost. Importantly, controlled electrodeposition is possible even into high aspect ratio of templates including anodized aluminum oxide-AAO, diblock copolymers-DBC, carbonate membranes, and porous silicone. Porous AAO templates are particularly attractive since the pore diameters can be 10-300 nm with pore densities in the range of 10 9 to 10 11 cm −2 . 4 Ferromagnetic nanowire arrays have been used as a miniaturized devices in electronics and optics. 5 In addition, such nanowires have a promising biomagnetic applications like biosensing, cell separation, MRI contrast agents and magnetic hyperthermia. [6][7][8][9][10] Most biomagnetic studies have been limited to nanometer iron-oxide based nanoparticles for MRI imaging and magnetic hyperthermia.6 However, the low saturation magnetization of the bulk iron-oxides (e.g. B s ∼0.5 T for Fe 2 O 3 11 ) prevents them from becoming highly efficient in hypertherm...

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“…Varieties of FeCo alloy nanowires can be prepared by electrodeposition using the porous alumina membranes as templates [19][20][21]. The liquid-phase chemical reduction is another method often used to synthesize Fe-based nanoparticles [22,23].…”

Section: Introductionmentioning

confidence: 99%

Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

Cao

Yang

et al. 2015

J Supercond Nov Magn

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The high-purity FeCo particles with particle size ranging from 100 nm to 5 μm are fabricated using a direct chemical method. The controlled morphologies of the FeCo samples vary from nearly-spherical to urchin-like or cubic shape under optimal reaction conditions. Very slight surface oxidation is observed in these large-grain FeCo particles. It shows a low coercivity with 91 Oe for the nearly-spherical FeCo particles, while a much higher coercivity of 236 Oe is observed in the urchin-like samples, which can be mainly ascribed to their different morphologies and particle sizes. High saturation magnetization of 205-211 A/m 2 /kg can be achieved in these micron-level FeCo particles due to their high purity and single bodycentered cubic (bcc) phase structure. The compositioncontrolled FeCo particles with different Fe/Co atom ratios can be obtained by adjusting the reaction temperature, which results in their variable saturation magnetization. The relative simple and low-cost chemical synthesis of large-grain FeCo particles promise their potential use in complicated shape and miniaturized FeCo-based magnetic components.

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Fabrication and magnetic properties of Fe3Co7 alloy nanowire arrays

Cited by 15 publications

References 16 publications

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization

Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

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Fabrication and magnetic properties of Fe3Co7 alloy nanowire arrays

Cited by 15 publications

References 16 publications

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Ultrathin, High-Aspect Ratio, and Free-Standing Magnetic Nanowires by Exfoliation of Ferromagnetic Quasi-One-Dimensional van der Waals Lattices

Controlled Electrodeposition and Magnetic Properties of Co35Fe65Nanowires with High Saturation Magnetization

Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

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Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization