Magnetization reversal in perpendicular exchange-biased multilayers |
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Authors: | J?Moritz Email author" target="_blank">S?van DijkenEmail author J MD?Coey |
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Institution: | (1) Physics Department, SFI Trinity Nanoscience Laboratory, Trinity College, Dublin, Ireland |
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Abstract: | Co/Pt multilayers with perpendicular magnetic anisotropy exhibit an exchange
bias when covered with an IrMn layer. The exchange bias field, which is
about 7 mT for 3 Co/Pt bilayer repetitions and a Co layer thickness of 5 Å, can be increased up to 16.5 mT by the insertion of a thin Pt layer at
the Co/IrMn interface. The interfacial magnetic anisotropy of the Co/IrMn interface
(KSCo/IrMn =-0.09 mJ/m2) favours in-plane magnetization
and tends to tilt the Co spins away from the film normal. Dynamical
measurements of the magnetization reversal process reveal that both
thermally activated spin reversal in the IrMn layer and domain wall
nucleation in the Co/Pt multilayer influence the interfacial spin structure
and therefore the strength of the perpendicular exchange bias field. |
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Keywords: | |
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