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

Qingfeng Zhan; Ziyu Chen; Desheng Xue; Fashen Li; Henry Kunkel; Xuezhi Zhou; Roy Roshko; Gwyn Williams

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

Qingfeng Zhan
, Ziyu Chen^*
, Desheng Xue
, Fashen Li
, Henry Kunkel
, Xuezhi Zhou
, Roy Roshko
, Gwyn Williams

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

Arrays of Fe_1-xCo_x (0.0≤x≤1.0) nanowires have been fabricated by codepositing Fe and Co into porous anodic alumina. Transmission electron microscope results show that the nanowires are regular and uniform, about 7.5 μm in length and 20 nm in diameter. Structural determination by x-ray diffraction indicates that bcc(α), fcc(γ), and hcp(ε) Fe-Co phases appear with variation in composition. However, the phase boundaries are different from that in bulk Fe-Co alloys. Magnetic hysteresis loops measured at temperatures ranging from 5 K to 300 K demonstrate that the arrays of nanowires exhibit uniaxial magnetic anisotropy which is dependent on the shape of each individual nanowire. With increasing Co content, the coercivity of the nanowire arrays, with the magnetic field applied parallel to the wire, first increases and then reaches a maximum value before decreasing. The behavior is interpreted using a magnetization reversal model based on "chains of spheres" and the symmetric fanning mechanism.

Original language	English
Article number	134436
Pages (from-to)	1344361-1344366
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	13
State	Published - 1 Oct 2002
Externally published	Yes

Cite this

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title = "Structure and magnetic properties of Fe-Co nanowires in self-assembled arrays",

abstract = "Arrays of Fe1-xCox (0.0≤x≤1.0) nanowires have been fabricated by codepositing Fe and Co into porous anodic alumina. Transmission electron microscope results show that the nanowires are regular and uniform, about 7.5 μm in length and 20 nm in diameter. Structural determination by x-ray diffraction indicates that bcc(α), fcc(γ), and hcp(ε) Fe-Co phases appear with variation in composition. However, the phase boundaries are different from that in bulk Fe-Co alloys. Magnetic hysteresis loops measured at temperatures ranging from 5 K to 300 K demonstrate that the arrays of nanowires exhibit uniaxial magnetic anisotropy which is dependent on the shape of each individual nanowire. With increasing Co content, the coercivity of the nanowire arrays, with the magnetic field applied parallel to the wire, first increases and then reaches a maximum value before decreasing. The behavior is interpreted using a magnetization reversal model based on {"}chains of spheres{"} and the symmetric fanning mechanism.",

author = "Qingfeng Zhan and Ziyu Chen and Desheng Xue and Fashen Li and Henry Kunkel and Xuezhi Zhou and Roy Roshko and Gwyn Williams",

year = "2002",

month = oct,

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language = "英语",

volume = "66",

pages = "1344361--1344366",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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TY - JOUR

T1 - Structure and magnetic properties of Fe-Co nanowires in self-assembled arrays

AU - Zhan, Qingfeng

AU - Chen, Ziyu

AU - Xue, Desheng

AU - Li, Fashen

AU - Kunkel, Henry

AU - Zhou, Xuezhi

AU - Roshko, Roy

AU - Williams, Gwyn

PY - 2002/10/1

Y1 - 2002/10/1

N2 - Arrays of Fe1-xCox (0.0≤x≤1.0) nanowires have been fabricated by codepositing Fe and Co into porous anodic alumina. Transmission electron microscope results show that the nanowires are regular and uniform, about 7.5 μm in length and 20 nm in diameter. Structural determination by x-ray diffraction indicates that bcc(α), fcc(γ), and hcp(ε) Fe-Co phases appear with variation in composition. However, the phase boundaries are different from that in bulk Fe-Co alloys. Magnetic hysteresis loops measured at temperatures ranging from 5 K to 300 K demonstrate that the arrays of nanowires exhibit uniaxial magnetic anisotropy which is dependent on the shape of each individual nanowire. With increasing Co content, the coercivity of the nanowire arrays, with the magnetic field applied parallel to the wire, first increases and then reaches a maximum value before decreasing. The behavior is interpreted using a magnetization reversal model based on "chains of spheres" and the symmetric fanning mechanism.

AB - Arrays of Fe1-xCox (0.0≤x≤1.0) nanowires have been fabricated by codepositing Fe and Co into porous anodic alumina. Transmission electron microscope results show that the nanowires are regular and uniform, about 7.5 μm in length and 20 nm in diameter. Structural determination by x-ray diffraction indicates that bcc(α), fcc(γ), and hcp(ε) Fe-Co phases appear with variation in composition. However, the phase boundaries are different from that in bulk Fe-Co alloys. Magnetic hysteresis loops measured at temperatures ranging from 5 K to 300 K demonstrate that the arrays of nanowires exhibit uniaxial magnetic anisotropy which is dependent on the shape of each individual nanowire. With increasing Co content, the coercivity of the nanowire arrays, with the magnetic field applied parallel to the wire, first increases and then reaches a maximum value before decreasing. The behavior is interpreted using a magnetization reversal model based on "chains of spheres" and the symmetric fanning mechanism.

UR - https://www.scopus.com/pages/publications/0344378026

M3 - 文章

AN - SCOPUS:0344378026

SN - 0163-1829

VL - 66

SP - 1344361

EP - 1344366

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

M1 - 134436

ER -

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

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