Low-temperature magnetic properties of hematite nanorods

Yimin Zhao; Charles W. Dunnill; Yanqiu Zhu; Duncan H. Gregory; Walter Kockenberger; Yanhui Li; Weibing Hu; Iftikhar Ahmad; David G. McCartney

doi:10.1021/cm062375a

Low-temperature magnetic properties of hematite nanorods

Yimin Zhao, Charles W. Dunnill, Yanqiu Zhu, Duncan H. Gregory, Walter Kockenberger, Yanhui Li, Weibing Hu, Iftikhar Ahmad, David G. McCartney

Department of Advanced Device Materials

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74 Citations (Scopus)

Abstract

Low-temperature magnetic properties of hematite nanorods, prepared by both iron-water vapor reactions (sample 1) and hydrothermal methods (sample 2), were studied by superconducting quantum interference device (SQUID) magnetometry. The Morin transition temperature was found to be 122 K in hematite nanorod sample 1, and an unexpected phenomenon was found under an applied field of 10 Oe. These nanorods (sample 1) show an abrupt decrease of the magnetic susceptibility at ca. 122 K, contrary to the abrupt increase normally attributed to the Morin transition in bulk hematite. The origin of this phenomenon can be traced to the probable coherence of the one-dimensional shape anisotropy with the magnetocrystalline anisotropy. In contrast, no obvious Morin transition was found in hematite nanorod sample 2.

Original language	English
Pages (from-to)	916-921
Number of pages	6
Journal	Chemistry of Materials
Volume	19
Issue number	4
DOIs	https://doi.org/10.1021/cm062375a
Publication status	Published - Feb 20 2007

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm062375a

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title = "Low-temperature magnetic properties of hematite nanorods",

abstract = "Low-temperature magnetic properties of hematite nanorods, prepared by both iron-water vapor reactions (sample 1) and hydrothermal methods (sample 2), were studied by superconducting quantum interference device (SQUID) magnetometry. The Morin transition temperature was found to be 122 K in hematite nanorod sample 1, and an unexpected phenomenon was found under an applied field of 10 Oe. These nanorods (sample 1) show an abrupt decrease of the magnetic susceptibility at ca. 122 K, contrary to the abrupt increase normally attributed to the Morin transition in bulk hematite. The origin of this phenomenon can be traced to the probable coherence of the one-dimensional shape anisotropy with the magnetocrystalline anisotropy. In contrast, no obvious Morin transition was found in hematite nanorod sample 2.",

author = "Yimin Zhao and Dunnill, {Charles W.} and Yanqiu Zhu and Gregory, {Duncan H.} and Walter Kockenberger and Yanhui Li and Weibing Hu and Iftikhar Ahmad and McCartney, {David G.}",

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T1 - Low-temperature magnetic properties of hematite nanorods

AU - Zhao, Yimin

AU - Dunnill, Charles W.

AU - Zhu, Yanqiu

AU - Gregory, Duncan H.

AU - Kockenberger, Walter

AU - Li, Yanhui

AU - Hu, Weibing

AU - Ahmad, Iftikhar

AU - McCartney, David G.

PY - 2007/2/20

Y1 - 2007/2/20

N2 - Low-temperature magnetic properties of hematite nanorods, prepared by both iron-water vapor reactions (sample 1) and hydrothermal methods (sample 2), were studied by superconducting quantum interference device (SQUID) magnetometry. The Morin transition temperature was found to be 122 K in hematite nanorod sample 1, and an unexpected phenomenon was found under an applied field of 10 Oe. These nanorods (sample 1) show an abrupt decrease of the magnetic susceptibility at ca. 122 K, contrary to the abrupt increase normally attributed to the Morin transition in bulk hematite. The origin of this phenomenon can be traced to the probable coherence of the one-dimensional shape anisotropy with the magnetocrystalline anisotropy. In contrast, no obvious Morin transition was found in hematite nanorod sample 2.

AB - Low-temperature magnetic properties of hematite nanorods, prepared by both iron-water vapor reactions (sample 1) and hydrothermal methods (sample 2), were studied by superconducting quantum interference device (SQUID) magnetometry. The Morin transition temperature was found to be 122 K in hematite nanorod sample 1, and an unexpected phenomenon was found under an applied field of 10 Oe. These nanorods (sample 1) show an abrupt decrease of the magnetic susceptibility at ca. 122 K, contrary to the abrupt increase normally attributed to the Morin transition in bulk hematite. The origin of this phenomenon can be traced to the probable coherence of the one-dimensional shape anisotropy with the magnetocrystalline anisotropy. In contrast, no obvious Morin transition was found in hematite nanorod sample 2.

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Low-temperature magnetic properties of hematite nanorods

Abstract

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