Magnetic field annealing dependent magnetic properties of Co90 Pt10 nanowire arrays

S. Shamaila; R. Sharif; J. Y. Chen; H. R. Liu; X. F. Han

doi:10.1016/j.jmmm.2009.07.081

Magnetic field annealing dependent magnetic properties of Co₉₀ Pt₁₀ nanowire arrays

S. Shamaila, R. Sharif, J. Y. Chen, H. R. Liu, X. F. Han

Electrical and Computer Engineering

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

18 Scopus citations

Abstract

Co₉₀ Pt₁₀ alloy and elemental Co nanowires (NWs) are fabricated by electrodeposition in the self-assembled anodic alumina templates. The fabricated NWs are subjected to magnetic field (MF) annealing under 1000 Oe applied magnetic field in a direction parallel to the nanowire axis at 265 °C. The corresponding changes in the saturation magnetization, coercivity, remanent squareness, the shape of hysteresis loops and crystal structure of NWs before and after MF annealing have been investigated. The enhanced magnetic anisotropy has been observed in Co₉₀ Pt₁₀ alloy NWs by MF annealing. The elemental Co NWs have not been affected by MF annealing. The stress relief between the domains and diffusional pair ordering of unlike atoms along the direction of external applied field are thought to be the causes of enhanced anisotropy. Re-annealing of the samples in the absence of magnetic field at 600 °C does not completely remove the enhanced anisotropy. The shape of the NWs is concluded to play major role in persistence of enhanced magnetic anisotropy after high temperature reannealing.

Original language	English (US)
Pages (from-to)	3984-3989
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	24
DOIs	https://doi.org/10.1016/j.jmmm.2009.07.081
State	Published - Dec 2009

Bibliographical note

Funding Information:
This research was supported by the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST, Grant no. 2006CB932200), and Chinese National Natural Science Foundation (NSFC, Grant nos. 10574156, 50528101 and 50721001).

Keywords

CoPt nanowires
Magnetic anisotropy
Magnetic field annealing

Publisher link

10.1016/j.jmmm.2009.07.081

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@article{ad4e7dbad4d547859358017f31fb51ed,

title = "Magnetic field annealing dependent magnetic properties of Co90 Pt10 nanowire arrays",

abstract = "Co90 Pt10 alloy and elemental Co nanowires (NWs) are fabricated by electrodeposition in the self-assembled anodic alumina templates. The fabricated NWs are subjected to magnetic field (MF) annealing under 1000 Oe applied magnetic field in a direction parallel to the nanowire axis at 265 °C. The corresponding changes in the saturation magnetization, coercivity, remanent squareness, the shape of hysteresis loops and crystal structure of NWs before and after MF annealing have been investigated. The enhanced magnetic anisotropy has been observed in Co90 Pt10 alloy NWs by MF annealing. The elemental Co NWs have not been affected by MF annealing. The stress relief between the domains and diffusional pair ordering of unlike atoms along the direction of external applied field are thought to be the causes of enhanced anisotropy. Re-annealing of the samples in the absence of magnetic field at 600 °C does not completely remove the enhanced anisotropy. The shape of the NWs is concluded to play major role in persistence of enhanced magnetic anisotropy after high temperature reannealing.",

keywords = "CoPt nanowires, Magnetic anisotropy, Magnetic field annealing",

author = "S. Shamaila and R. Sharif and Chen, {J. Y.} and Liu, {H. R.} and Han, {X. F.}",

note = "Funding Information: This research was supported by the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST, Grant no. 2006CB932200), and Chinese National Natural Science Foundation (NSFC, Grant nos. 10574156, 50528101 and 50721001).",

year = "2009",

month = dec,

doi = "10.1016/j.jmmm.2009.07.081",

language = "English (US)",

volume = "321",

pages = "3984--3989",

journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Magnetic field annealing dependent magnetic properties of Co90 Pt10 nanowire arrays

AU - Shamaila, S.

AU - Sharif, R.

AU - Chen, J. Y.

AU - Liu, H. R.

AU - Han, X. F.

N1 - Funding Information: This research was supported by the State Key Project of Fundamental Research, Ministry of Science and Technology (MOST, Grant no. 2006CB932200), and Chinese National Natural Science Foundation (NSFC, Grant nos. 10574156, 50528101 and 50721001).

PY - 2009/12

Y1 - 2009/12

N2 - Co90 Pt10 alloy and elemental Co nanowires (NWs) are fabricated by electrodeposition in the self-assembled anodic alumina templates. The fabricated NWs are subjected to magnetic field (MF) annealing under 1000 Oe applied magnetic field in a direction parallel to the nanowire axis at 265 °C. The corresponding changes in the saturation magnetization, coercivity, remanent squareness, the shape of hysteresis loops and crystal structure of NWs before and after MF annealing have been investigated. The enhanced magnetic anisotropy has been observed in Co90 Pt10 alloy NWs by MF annealing. The elemental Co NWs have not been affected by MF annealing. The stress relief between the domains and diffusional pair ordering of unlike atoms along the direction of external applied field are thought to be the causes of enhanced anisotropy. Re-annealing of the samples in the absence of magnetic field at 600 °C does not completely remove the enhanced anisotropy. The shape of the NWs is concluded to play major role in persistence of enhanced magnetic anisotropy after high temperature reannealing.

AB - Co90 Pt10 alloy and elemental Co nanowires (NWs) are fabricated by electrodeposition in the self-assembled anodic alumina templates. The fabricated NWs are subjected to magnetic field (MF) annealing under 1000 Oe applied magnetic field in a direction parallel to the nanowire axis at 265 °C. The corresponding changes in the saturation magnetization, coercivity, remanent squareness, the shape of hysteresis loops and crystal structure of NWs before and after MF annealing have been investigated. The enhanced magnetic anisotropy has been observed in Co90 Pt10 alloy NWs by MF annealing. The elemental Co NWs have not been affected by MF annealing. The stress relief between the domains and diffusional pair ordering of unlike atoms along the direction of external applied field are thought to be the causes of enhanced anisotropy. Re-annealing of the samples in the absence of magnetic field at 600 °C does not completely remove the enhanced anisotropy. The shape of the NWs is concluded to play major role in persistence of enhanced magnetic anisotropy after high temperature reannealing.

KW - CoPt nanowires

KW - Magnetic anisotropy

KW - Magnetic field annealing

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