Magnetic properties and crystal structures of self-ordered ferromagnetic nanowires by ac electroforming

K. H. Lee; H. Y. Lee; W. Y. Jeung; W. Y. Lee

doi:10.1063/1.1450827

Magnetic properties and crystal structures of self-ordered ferromagnetic nanowires by ac electroforming

K. H. Lee, H. Y. Lee, W. Y. Jeung, W. Y. Lee

Department of Materials Science and Engineering

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

29 Citations (Scopus)

Abstract

We have investigated the magnetic properties and crystal structures of α-Fe and Fe ₂₁Ni ₇₉ nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO). The nanopores were found to have diameters of 5-100 nm and aspect ratios of 300-1000 depending on the anodization conditions. X-ray diffraction patterns provide direct experimental evidence that the α-Fe and Fe ₂₁Ni ₇₉ nanowires have preferred crystallographic orientations, indicating that those were electroformed in the (221) and (220) orientations, respectively. For the α-Fe (Fe ₂₁Ni ₇₉) nanowires, coercivity H _c and squareness M _r/M _s were found to be ∼2.02 (∼1.20) kOe and ∼0.9 (∼0.99), respectively. It is observed that the coercivity in Fe ₂₁Ni ₇₉ nanowires increased up to 1.35 kOe with increasing annealing temperature.

Original language	English
Pages (from-to)	8513-8515
Number of pages	3
Journal	Journal of Applied Physics
Volume	91
Issue number	10 I
DOIs	https://doi.org/10.1063/1.1450827
Publication status	Published - 2002 May 15

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.1450827

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title = "Magnetic properties and crystal structures of self-ordered ferromagnetic nanowires by ac electroforming",

abstract = "We have investigated the magnetic properties and crystal structures of α-Fe and Fe 21Ni 79 nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO). The nanopores were found to have diameters of 5-100 nm and aspect ratios of 300-1000 depending on the anodization conditions. X-ray diffraction patterns provide direct experimental evidence that the α-Fe and Fe 21Ni 79 nanowires have preferred crystallographic orientations, indicating that those were electroformed in the (221) and (220) orientations, respectively. For the α-Fe (Fe 21Ni 79) nanowires, coercivity H c and squareness M r/M s were found to be ∼2.02 (∼1.20) kOe and ∼0.9 (∼0.99), respectively. It is observed that the coercivity in Fe 21Ni 79 nanowires increased up to 1.35 kOe with increasing annealing temperature.",

author = "Lee, {K. H.} and Lee, {H. Y.} and Jeung, {W. Y.} and Lee, {W. Y.}",

year = "2002",

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T1 - Magnetic properties and crystal structures of self-ordered ferromagnetic nanowires by ac electroforming

AU - Lee, K. H.

AU - Lee, H. Y.

AU - Jeung, W. Y.

AU - Lee, W. Y.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - We have investigated the magnetic properties and crystal structures of α-Fe and Fe 21Ni 79 nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO). The nanopores were found to have diameters of 5-100 nm and aspect ratios of 300-1000 depending on the anodization conditions. X-ray diffraction patterns provide direct experimental evidence that the α-Fe and Fe 21Ni 79 nanowires have preferred crystallographic orientations, indicating that those were electroformed in the (221) and (220) orientations, respectively. For the α-Fe (Fe 21Ni 79) nanowires, coercivity H c and squareness M r/M s were found to be ∼2.02 (∼1.20) kOe and ∼0.9 (∼0.99), respectively. It is observed that the coercivity in Fe 21Ni 79 nanowires increased up to 1.35 kOe with increasing annealing temperature.

AB - We have investigated the magnetic properties and crystal structures of α-Fe and Fe 21Ni 79 nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO). The nanopores were found to have diameters of 5-100 nm and aspect ratios of 300-1000 depending on the anodization conditions. X-ray diffraction patterns provide direct experimental evidence that the α-Fe and Fe 21Ni 79 nanowires have preferred crystallographic orientations, indicating that those were electroformed in the (221) and (220) orientations, respectively. For the α-Fe (Fe 21Ni 79) nanowires, coercivity H c and squareness M r/M s were found to be ∼2.02 (∼1.20) kOe and ∼0.9 (∼0.99), respectively. It is observed that the coercivity in Fe 21Ni 79 nanowires increased up to 1.35 kOe with increasing annealing temperature.

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Magnetic properties and crystal structures of self-ordered ferromagnetic nanowires by ac electroforming

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