| Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al2O3 ceramics |
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| 引用本文： | 焦志伟,陈苗根,姜伟棣,冯春木,叶高翔.Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al2O3 ceramics[J].中国物理 B,2008,17(9):3499-3504. |
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| 作者姓名： | 焦志伟 陈苗根 姜伟棣 冯春木 叶高翔 |
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| 作者单位： | Department of Physics, Zhejiang University,
Hangzhou
310027, China;Department of Physics, China Jiliang University, Hangzhou
310018, China;Department of Physics, China Jiliang University, Hangzhou
310018, China;Department of Physics, China Jiliang University, Hangzhou
310018, China;Test and Analysis Center, Zhejiang University, Hangzhou
310028, China;Department of Physics, Zhejiang University,
Hangzhou
310027, China |
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| 基金项目： | Project supported by the National
Natural Science Foundation of China (Grant Nos 10574109 and
50701037) and the Zhejiang Provincial Science
and Technology Department of China (Grant No 2005C24008). |
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| 摘 要： | An iron film percolation system is fabricated by vapour-phase deposition on fracture surfaces of α-Al2O3 ceramics. The zero-field-cooled （ZFC） and field-cooled （FC） magnetization measurement reveals that the magnetic phase of the film samples evolve from a high-temperature ferromagnetic state to a low-temperature spin-glass-like state, which is also demonstrated by the temperature-dependent ac susceptibility of the iron films. The temperature dependence of the exchange bias field He of the iron film exhibits a minimum peak around the temperature T=5 K, which is independent of the magnitude of the cooling field Hcf. However, for T 〉 10K, （1） He is always negative when Hcf=2kOe and （2） for Hcf= 20 kOe （1Oe≈80 A/m）, He changes from negative to positive values as T increases. Our experimental results show that the anomalous hysteresis properties mainly result from the oxide surfaces of the films with spin-glass-like phase.
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| 关 键 词： | 交换相互作用 磁测量 铁膜 制陶术 |
| 收稿时间： | 2007-11-07 |
Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al2O3 ceramics |
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| Jiao Zhi-Wei,Chen Miao-Gen,Jiang Wei-Di,Feng Chun-Mu and Ye Gao-Xiang.Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al2O3 ceramics[J].Chinese Physics B,2008,17(9):3499-3504. |
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| Authors: | Jiao Zhi-Wei Chen Miao-Gen Jiang Wei-Di Feng Chun-Mu and Ye Gao-Xiang |
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| Institution: | Department of Physics, China Jiliang University, Hangzhou
310018, China; Department of Physics, Zhejiang University,
Hangzhou
310027, China; Department of Physics, Zhejiang University,
Hangzhou
310027, China;Department of Physics, China Jiliang University, Hangzhou
310018, China; Test and Analysis Center, Zhejiang University, Hangzhou
310028, China |
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| Abstract: | An iron film percolation system is fabricated by vapour-phase
deposition on fracture surfaces of α-Al2O3 ceramics.
The zero-field-cooled (ZFC) and field-cooled (FC) magnetization
measurement reveals that the magnetic phase of the film samples
evolve from a high-temperature ferromagnetic state to a
low-temperature spin-glass-like state, which is also demonstrated by
the temperature-dependent ac susceptibility of the iron films. The
temperature dependence of the exchange bias field $H_{\rm e}$ of the
iron film exhibits a minimum peak around the temperature $T$=5\,K,
which is independent of the magnitude of the cooling field $H_{\rm
cf}$. However, for $T > 10$\,K, (1) $H_{\rm e}$ is always negative
when $H_{\rm cf}$=2\,kOe and (2) for $H_{\rm cf }$= 20\,kOe
(1Oe$\approx$80\,A/m), $H_{\rm e}$ changes from negative to positive
values as T increases. Our experimental results show that the
anomalous hysteresis properties mainly result from the oxide
surfaces of the films with spin-glass-like phase. |
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| Keywords: | iron film ceramics exchange
interactions magnetic measurements |
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