A Simple Model to Describe Different Types of Exchange Bias Training Effect

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• 作者：Yangqun Zhang ; Wenbin Rui ; Zhong Shi…
• 关键词：Exchange bias ; Training effect ; Pinning magnetization ; Interfacial exchange coupling
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：29
• 期：2
• 页码：531-536
• 全文大小：926 KB
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• 作者单位：Yangqun Zhang (1)
  Wenbin Rui (1)
  Zhong Shi (2)
  Shiming Zhou (2)
  Mao Yang (3)
  Biao You (1) (4)
  Jun Du (1) (4)
  
  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, People’s Republic of China
  2. Department of Physics, Tongji University, Shanghai, 200092, People’s Republic of China
  3. School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, People’s Republic of China
  4. Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, People’s Republic of China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

The exchange bias (EB) training effect, referring to the exchange field (H _E) and/or the coercivity (H _C) decreasing with the magnetic cycle (n), is often accompanied with EB. Usually, the EB training effect has different types, showing that H _C1 (coercive field at the descending branch) and H _C2 (coercive field at the ascending branch) change with n differently. In order to understand the origin producing the training type, a phenomenological model is therefore proposed. According to this model, how H _C1 (or H _C2) changes with n is determined by the change of pinning magnetization at the descending (or ascending) branch during the training process. For verifying the validity of our model, various experimental training results with respect to different exchange-biased systems are selected for fitting and all the fitting results are nearly perfect. Keywords Exchange bias Training effect Pinning magnetization Interfacial exchange coupling