| CoNi/CoO 双层膜磁化反转机制与温度的依赖关系 |
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| 引用本文： | 宋金涛,袁淑娟.CoNi/CoO 双层膜磁化反转机制与温度的依赖关系[J].上海大学学报(英文版),2007,11(6):562-565. |
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| 作者姓名： | 宋金涛 袁淑娟 |
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| 作者单位： | Library Fudan University，2.Department of Physics，College of Sciences，Shanghai University，Shanghai 200433，P.R.China，Shanghai 200444，P.R.China |
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| 基金项目： | 国家自然科学基金;上海市重点学科建设项目;上海市自然科学基金 |
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| 摘 要： | Exchange coupling and magnetization reversal mechanism in two series of Co_xNi_(1-x)/CoO(30 nm)(x=0.2 and 0.4)bilayers are studied by vector magnetometer.Two components of magnetization are measured parallel and perpendicular to the applied field.At low temperatures,coercivity H_c∝(t_(FM))~(-n),n=1.5 and 1.38 for x=0.2 and 0.4,respectively,in agreement with the random field model.At room temperature,the coercivity is nearly proportional to the inverse FM layer thickness.In addition to the exchange field and the coercivity,the characteristic of the magnetization reversal mechanism was found to change with temperature.At temperatures below 180 K,magnetization reversal process along the unidirectional axis is accompanied only by nucleation and pinning of domain wall while magnetization rotation is also involved at high temperatures.
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| 关 键 词： | CoNi／CoO 双层膜 磁化反转机制 温度 依赖关系 |
| 收稿时间： | 10 April 2006 |
| 修稿时间： | 2006-04-10 |
Temperature dependence of magnetization reversal mechanism in CoNi/CoO bilayers |
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| SONG Jin-tao,YUAN Shu-juan.Temperature dependence of magnetization reversal mechanism in CoNi/CoO bilayers[J].Journal of Shanghai University(English Edition),2007,11(6):562-565. |
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| Authors: | SONG Jin-tao YUAN Shu-juan |
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| Institution: | 1. Library, Fudan University, Shanghai 200433, P. R. China
2. Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, P. R. China |
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| Abstract: | Exchange coupling and magnetization reversal mechanism in two series of Co
x
Ni1−x
/CoO (30 nm) (x=0.2 and 0.4) bilayers are studied by vector magnetometer. Two components of magnetization are measured parallel and perpendicular
to the applied field. At low temperatures, coercivity H
c ∝ (t
FM)−n
n = 1.5 and 1.38 for x = 0.2 and 0.4, respectively, in agreement with the random field model. At room temperature, the coercivity is nearly proportional
to the inverse FM layer thickness. In addition to the exchange field and the coercivity, the characteristic of the magnetization
reversal mechanism was found to change with temperature. At temperatures below 180 K, magnetization reversal process along
the unidirectional axis is accompanied only by nucleation and pinning of domain wall while magnetization rotation is also
involved at high temperatures.
Project supported by the National Natural Science Foundation of China (Grant No.10504019), the Shanghai Leading Academic Discipline
Program (Grant No.T0104), and the Science Foundation of Shanghai Municipal Commission of Education (Grant No.05AZ10) |
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| Keywords: | exchange coupling bilayer magnetization reversal temperature dependence |
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