Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature

Kun Zhao; Jie Xing; Yu Zi Liu; Jian Gao Zhao; Hui Bin Lü

doi:10.1007/s11434-007-0233-x

Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature

Kun Zhao, Jie Xing, Yu Zi Liu, Jian Gao Zhao, Hui Bin Lü

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

1 Scopus citations

Abstract

Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe₃O₄, γ-Fe ₂O₃ and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined columnar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction.

Original language	English
Pages (from-to)	1607-1611
Number of pages	5
Journal	Chinese Science Bulletin
Volume	52
Issue number	12
DOIs	https://doi.org/10.1007/s11434-007-0233-x
State	Published - Jun 2007
Externally published	Yes

Funding

Received November 14, 2006; accepted February 13, 2007 doi: 10.1007/s11434-007-0233-x †Corresponding author (email: [email protected]) Supported by the National Natural Science Foundation of China (Grant Nos. 50672132 and 60576015) and the Key Project of Chinese Ministry of Education (Grant No. 107020)

Keywords

Magnetic properties
Magnetoresistance
Thin film

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10.1007/s11434-007-0233-x

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abstract = "Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe3O4, γ-Fe 2O3 and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined columnar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction.",

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T1 - Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature

AU - Zhao, Kun

AU - Xing, Jie

AU - Liu, Yu Zi

AU - Zhao, Jian Gao

AU - Lü, Hui Bin

PY - 2007/6

Y1 - 2007/6

N2 - Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe3O4, γ-Fe 2O3 and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined columnar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction.

AB - Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe3O4, γ-Fe 2O3 and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined columnar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction.

KW - Magnetic properties

KW - Magnetoresistance

KW - Thin film

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Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature

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