Dominance of Shape Anisotropy among Magnetostatic Interaction and Magnetocrystalline Anisotropy in Electrodeposited (FeCo)1−xCux (X = 0.1–0.5) Ternary Alloy Nanowires

Ahmad, Naeem; Shafiq, Maryam; Khan, Shazia; Shah, Wiqar Hussain; Murtaza, Imran; Majid, Abdul; Javed, Khalid

doi:10.1007/s10948-019-05394-0

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…Во всех случаях использовалась матрица из пористого оксида алюминия. В работе [20] были изучены составы с содержанием меди более 10%, и было показано, что H c уменьшается с ростом этой концентрации. В работе [21] получены и исследованы НП с диаметром 18−27 nm и содержанием меди 5%.…”

Section: международный симпозиум "unclassified

Нанопроволоки Из Двух- И Трехкомпонентных Сплавов: Корреляция Структурных И Магнитных Свойств

Khairetdinova¹,

Долуденко²,

Панина³

et al. 2022

Физика Твердого Тела

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Several types of nanowires (NWs) made of alloys of various compositions obtained by the method of matrix synthesis based on track membranes have been studied. Electrolytes were selected to obtain NWs of the desired composition. The control of electrodeposition by chronoamperograms made it possible to systematically change the geometric parameters and morphology. The topographies of the resulting NW arrays and their elemental composition were studied using electron microscopy with an X-ray spectral analyzer. The magnetic properties of the samples were studied on a vibrating magnetometer. The structures of binary alloys were studied: for NWs of FeCo alloys, the dependence of the coercive force on the composition was studied. The obtained dependence has two maxima - at an equiatomic composition and at a cobalt content of about 90%. For Fe0.3Co0.7 NWs, a sharp increase in the coercive force with decreasing diameter is shown. It is assumed that this effect is due to the formation of single-domain crystallites, the processes of magnetization reversal of which are associated with a uniform rotation of the magnetization. For NWs made of FeNi alloys, the influence of the aspect ratio on the coercive force has been proved. Ternary alloys of the FeCoCu system have been studied: it has been shown that the addition of copper significantly increases the coercive force, which reaches a maximum at a copper content of about 5%. The obtained X-ray data suggest that the effect of an increase in the coercive force is associated with the formation of fine-grained inclusions based on copper, which lead to effective deceleration of the domain walls. The data obtained expand the range of possibilities for controlling the magnetic properties of NW arrays obtained by the method of matrix synthesis. Keywords: nanowires, matrix synthesis, microscopy, elemental analysis, magnetic properties, coercive force.

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Section: международный симпозиум "unclassified

Нанопроволоки Из Двух- И Трехкомпонентных Сплавов: Корреляция Структурных И Магнитных Свойств

Khairetdinova¹,

Долуденко²,

Панина³

et al. 2022

Физика Твердого Тела

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“…[52] Few attempts have been made recently to understand the effects of magnetostatic interactions on coercivity of nanowire assemblies with proximity control, when the packing density increases, the interaction is enhanced, leading to a decrease in coercivity. [51,[53][54][55][56] Because the nanowires in those reported works are not single domain structure, the packing fraction dependence of coercivity shall not follow the linear relationship formula given in equation 2. [50,52] In our case, the compacted assemblies of Co NWs with diameter of 20 and 15 nm show a linear decrease in coercivity values with packing fraction due to the proximity effect.…”

Section: (6 Of 10)mentioning

confidence: 99%

Extraordinary Magnetic Hardening in Nanowire Assemblies: the Geometry and Proximity Effects

Mohapatra

Xing

Elkins

et al. 2021

Adv Funct Materials

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Brown's theorem on coercivity of ferromagnetic materials has predicted that the coercivity level is substantially higher than in practice for all the materials studied in experiments in the past seven decades, which is known as the Brown's paradox. In this paper, a system with a coercivity close to the one predicted by Brown's theorem is investigated. Cobalt nanowires are obtained by chemical synthesis that give rise to coercive forces significantly higher than the magnetocrystalline anisotropy field, verifying the Brown's theorem. It is found that the coercivity is strongly dependent on the nanowire diameter, the alignment of the wires in an assembly, and the packing density of the assembly. An analysis based on the current experimental results and related literature reveals a coercivity ceiling in consideration of geometrical dimensions and the effective magnetic anisotropy. Quantitative information is obtained about the proximity effect on the coercivity and the magnetization which shows the correlation between the energy product and the packing density. Furthermore, it is found that by coating the nanowires with Fe, the energy density can be enhanced. These findings provide a guideline for materials design of future high‐performance permanent magnets that take advantage of shape anisotropy at the nanoscale.

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“…In all cases, an aluminium oxide matrix was used. In work [20] formulations with a copper content of more than 10% have been studied, and it has been shown that H c decreases with this concentration. In work [21] NW with a diameter of 18−27 nm and a copper content of 5% were obtained and investigated.…”

Section: Introductionmentioning

confidence: 99%

Two- and three-component alloys nanowires: correlation of structural and magnetic properties

Khayretdinova

Долуденко

Panina

et al. 2022

Physics of the Solid State

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Several types of nanowires (NWs) made of alloys of various compositions obtained by the method of matrix synthesis based on track membranes have been studied. Electrolytes were selected to obtain NWs of the desired composition. The control of electrodeposition by chronoamperograms made it possible to systematically change the geometric parameters and morphology. The topographies of the resulting NW arrays and their elemental composition were studied using electron microscopy with an X-ray spectral analyzer. The magnetic properties of the samples were studied on a vibrating magnetometer. The structures of binary alloys were studied: for NWs of FeCo alloys, the dependence of the coercive force on the composition was studied. The obtained dependence has two maxima --- at an equiatomic composition and at a cobalt content of about 90%. For Fe0.3Co0.7 NWs, a sharp increase in the coercive force with decreasing diameter is shown. It is assumed that this effect is due to the formation of single-domain crystallites, the processes of magnetization reversal of which are associated with a uniform rotation of the magnetization. For NWs made of FeNi alloys, the influence of the aspect ratio on the coercive force has been proved. Ternary alloys of the FeCoCu system have been studied: it has been shown that the addition of copper significantly increases the coercive force, which reaches a maximum at a copper content of about 5%. The obtained X-ray data suggest that the effect of an increase in the coercive force is associated with the formation of fine-grained inclusions based on copper, which lead to effective deceleration of the domain walls. The data obtained expand the range of possibilities for controlling the magnetic properties of NW arrays obtained by the method of matrix synthesis. Keywords: nanowires, matrix synthesis, microscopy, elemental analysis, magnetic properties, coercive force. Keywords: nanowires, matrix synthesis, microscopy, elemental analysis, magnetic properties, coercive force.

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Dominance of Shape Anisotropy among Magnetostatic Interaction and Magnetocrystalline Anisotropy in Electrodeposited (FeCo)1−xCux (X = 0.1–0.5) Ternary Alloy Nanowires

Cited by 10 publications

References 23 publications

Нанопроволоки Из Двух- И Трехкомпонентных Сплавов: Корреляция Структурных И Магнитных Свойств

Нанопроволоки Из Двух- И Трехкомпонентных Сплавов: Корреляция Структурных И Магнитных Свойств

Extraordinary Magnetic Hardening in Nanowire Assemblies: the Geometry and Proximity Effects

Two- and three-component alloys nanowires: correlation of structural and magnetic properties

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