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Anomalous Behavior of Coercivity in Ferromagnet/Antiferromagnet Bilayers

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The dependence of exchange-bias field (H EB) and coercivity (H C) on the ferromagnetic (FM) layer thickness in CoFe/IrMn and CoFe/FeMn bilayers was investigated. The coercivity of the CoFe/IrMn bilayers is very sensitive to the IrMn (110) structure. Through inserting a thin antiferromagnetic (AFM) FeMn layer into the CoFe/IrMn interface, an obvious change in the coercivity behavior is observed. Our results show that the interfacial magnetic domains play a prominent effect on the exchange-bias field, but a negligible influence on the coercivity behavior, suggesting that the enhanced coercivity in FM/AFM exchange biased system comes from the irreversible spin rotation in the AFM layer near interface.
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Document Type: Research Article

Publication date: 2012-04-01

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  • Journal of Spintronics and Magnetic Nanomaterials is an international multidisciplinary peer-reviewed journal reporting new developments in the fields of magnetic and spintronics materials including their synthesis, characterization, properties, and applications in electronics, photonics, telecommunications, computer sciences, medicine, health science, etc. JSM is the first journal devoted to the exciting field of spintronics, which is playing a fundamental role in the novel technological developments based on the new spin torque transfer phenomena.
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