Characterization of magnetoimpedance on polycrystalline and amorphous chromium oxides bilayered thin films

C. M. Fu; C. J. Lai; H. S. Hsu; Y. C. Chao; J. C.A. Huang; C. C. Wu; S. G. Shyu

doi:10.1063/1.1455605

Characterization of magnetoimpedance on polycrystalline and amorphous chromium oxides bilayered thin films

C. M. Fu^*, C. J. Lai, H. S. Hsu, Y. C. Chao, J. C.A. Huang, C. C. Wu, S. G. Shyu

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

The impedance of chemical vapor deposited CrO ₂ and Cr ₂O ₃ bilayered thin films, composed of polycrystalline and amorphous structure, have been systematically studied in function of frequency and temperature. In the polycrystalline-CrO ₂/amorphous-Cr ₂O ₃ bilayer, the real part of impedance at low frequency (f<300kHz) demonstrates a sharp transition at temperature around 330 K, with a specific feature of positive temperature coefficient, similar to the variation of dc resistance occurs at ferroelectric-paraelectric transition in the BaTiO ₃ ceramics. In contrast, the imaginary part of impedance, at frequency f>300kHz, shows a characteristic of negative temperature coefficient. Further analysis of the frequency dependence of the impedance shows the contribution from the dynamics of both the dielectric and magnetic dipoles in the layers. Comparison of polycrystalline-CrO ₂ and amorphous-Cr ₂O ₃ single layer with the CrO ₂/Cr ₂O ₃ bilayer is discussed.

Original language	English
Pages (from-to)	7143-7145
Number of pages	3
Journal	Journal of Applied Physics
Volume	91
Issue number	10 I
DOIs	https://doi.org/10.1063/1.1455605
Publication status	Published - 2002 May 15
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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@article{487ac998f2cd455a8bff183c1ab717d1,

title = "Characterization of magnetoimpedance on polycrystalline and amorphous chromium oxides bilayered thin films",

abstract = "The impedance of chemical vapor deposited CrO 2 and Cr 2O 3 bilayered thin films, composed of polycrystalline and amorphous structure, have been systematically studied in function of frequency and temperature. In the polycrystalline-CrO 2/amorphous-Cr 2O 3 bilayer, the real part of impedance at low frequency (f<300kHz) demonstrates a sharp transition at temperature around 330 K, with a specific feature of positive temperature coefficient, similar to the variation of dc resistance occurs at ferroelectric-paraelectric transition in the BaTiO 3 ceramics. In contrast, the imaginary part of impedance, at frequency f>300kHz, shows a characteristic of negative temperature coefficient. Further analysis of the frequency dependence of the impedance shows the contribution from the dynamics of both the dielectric and magnetic dipoles in the layers. Comparison of polycrystalline-CrO 2 and amorphous-Cr 2O 3 single layer with the CrO 2/Cr 2O 3 bilayer is discussed.",

author = "Fu, {C. M.} and Lai, {C. J.} and Hsu, {H. S.} and Chao, {Y. C.} and Huang, {J. C.A.} and Wu, {C. C.} and Shyu, {S. G.}",

year = "2002",

month = may,

day = "15",

doi = "10.1063/1.1455605",

language = "English",

volume = "91",

pages = "7143--7145",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "10 I",

}

TY - JOUR

T1 - Characterization of magnetoimpedance on polycrystalline and amorphous chromium oxides bilayered thin films

AU - Fu, C. M.

AU - Lai, C. J.

AU - Hsu, H. S.

AU - Chao, Y. C.

AU - Huang, J. C.A.

AU - Wu, C. C.

AU - Shyu, S. G.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - The impedance of chemical vapor deposited CrO 2 and Cr 2O 3 bilayered thin films, composed of polycrystalline and amorphous structure, have been systematically studied in function of frequency and temperature. In the polycrystalline-CrO 2/amorphous-Cr 2O 3 bilayer, the real part of impedance at low frequency (f<300kHz) demonstrates a sharp transition at temperature around 330 K, with a specific feature of positive temperature coefficient, similar to the variation of dc resistance occurs at ferroelectric-paraelectric transition in the BaTiO 3 ceramics. In contrast, the imaginary part of impedance, at frequency f>300kHz, shows a characteristic of negative temperature coefficient. Further analysis of the frequency dependence of the impedance shows the contribution from the dynamics of both the dielectric and magnetic dipoles in the layers. Comparison of polycrystalline-CrO 2 and amorphous-Cr 2O 3 single layer with the CrO 2/Cr 2O 3 bilayer is discussed.

AB - The impedance of chemical vapor deposited CrO 2 and Cr 2O 3 bilayered thin films, composed of polycrystalline and amorphous structure, have been systematically studied in function of frequency and temperature. In the polycrystalline-CrO 2/amorphous-Cr 2O 3 bilayer, the real part of impedance at low frequency (f<300kHz) demonstrates a sharp transition at temperature around 330 K, with a specific feature of positive temperature coefficient, similar to the variation of dc resistance occurs at ferroelectric-paraelectric transition in the BaTiO 3 ceramics. In contrast, the imaginary part of impedance, at frequency f>300kHz, shows a characteristic of negative temperature coefficient. Further analysis of the frequency dependence of the impedance shows the contribution from the dynamics of both the dielectric and magnetic dipoles in the layers. Comparison of polycrystalline-CrO 2 and amorphous-Cr 2O 3 single layer with the CrO 2/Cr 2O 3 bilayer is discussed.

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U2 - 10.1063/1.1455605

DO - 10.1063/1.1455605

M3 - Article

AN - SCOPUS:0037095106

SN - 0021-8979

VL - 91

SP - 7143

EP - 7145

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 10 I

ER -

Characterization of magnetoimpedance on polycrystalline and amorphous chromium oxides bilayered thin films

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