Exchange coupling between ferromagnetic and laminated antiferromagnetic layers and its application

Exchange bias (Hex) and coercivity (Hc) of the NiFe layer in the NiFe/IrMn system can be tuned by inserting either spacer layers such as Cu, Ru, and Ta or ferromagnetic layers such as CoFe into IrMn since the antiferromagnetic spin structure of IrMn is altered in consequence. Hex usually decreases w...

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Veröffentlicht in:Journal of applied physics 2003-11, Vol.94 (9), p.5905-5911
Hauptverfasser: Li, Kebin, Wu, Yihong, Han, Guchang, Luo, Ping, An, Lihua, Qiu, Jinjun, Guo, Zaibing, Zheng, Yuankai
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container_end_page 5911
container_issue 9
container_start_page 5905
container_title Journal of applied physics
container_volume 94
creator Li, Kebin
Wu, Yihong
Han, Guchang
Luo, Ping
An, Lihua
Qiu, Jinjun
Guo, Zaibing
Zheng, Yuankai
description Exchange bias (Hex) and coercivity (Hc) of the NiFe layer in the NiFe/IrMn system can be tuned by inserting either spacer layers such as Cu, Ru, and Ta or ferromagnetic layers such as CoFe into IrMn since the antiferromagnetic spin structure of IrMn is altered in consequence. Hex usually decreases while Hc increases when the thin discontinued spacer layers are inserted into IrMn. The crossover from the unidirectional exchange-biased coupling to the uniaxial exchange-spring coupling has been successfully observed in the NiFe/[IrMn/CoFe(t)]3/IrMn (here, 3 means the number of the repeated periods of IrMn/CoFe double layer) system when the thickness of CoFe layer t exceeds 1 nm. It indicates that much of the physics and reversal mechanisms in the exchanged-biased systems are similar to that observed in exchange-spring systems where the hard layer replaces the antiferromagnetic layer as the biasing layer. Uniaxial spin valves (both of current in the plane and current perpendicular to the plane modes) and uniaxial magnetic tunneling junctions have been successfully fabricated by using this uniaxial exchange-spring system.
doi_str_mv 10.1063/1.1616644
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Hex usually decreases while Hc increases when the thin discontinued spacer layers are inserted into IrMn. The crossover from the unidirectional exchange-biased coupling to the uniaxial exchange-spring coupling has been successfully observed in the NiFe/[IrMn/CoFe(t)]3/IrMn (here, 3 means the number of the repeated periods of IrMn/CoFe double layer) system when the thickness of CoFe layer t exceeds 1 nm. It indicates that much of the physics and reversal mechanisms in the exchanged-biased systems are similar to that observed in exchange-spring systems where the hard layer replaces the antiferromagnetic layer as the biasing layer. 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title Exchange coupling between ferromagnetic and laminated antiferromagnetic layers and its application
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