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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Large perpendicular exchange bias in IrMn/CoFe/[Pt/Co] multilayers grown on a Ta/Pt buffer layer
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Large perpendicular exchange bias in IrMn/CoFe/[Pt/Co] multilayers grown on a Ta/Pt buffer layer

机译：在Ta / Pt缓冲层上生长的IrMn / CoFe / [Pt / Co]多层膜中较大的垂直交换偏压

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摘要

Bottom pinned IrMn/[Co/Pt] multilayer films with relatively thin Pt layers (__10_) grown on a Ta/Pt buffer have been found to exhibit favourable perpendicular exchange bias (PEB) and well-defined perpendicular anisotropy at room temperature. However, even the optimum film suffers from the same problem as those reported previously, i.e. the exchange bias field is just slightly larger than the coercivity. By replacing the Co layer in contact with IrMn by a 6-8 _ Co_(60)Fe_(40) layer, the exchange bias is drastically enhanced while the large perpendicular anisotropy is sustained and the coercivity changes little. The exchange bias field for the IrMn/CoFe/[Pt/Co] films with sufficient high perpendicular anisotropy can reach a value as high as 950 Oe, which is almost three times the coercivity, and the corresponding unidirectional anisotropy, 0.22 erg cm-2, considerably exceeds the best result at room temperature for various PEB systems ever reported. The present result suggests that PEB strongly depends on the composition of the ferromagnetic layer across the interface, which opens an effective avenue to boost PEB.
机译：发现在Ta / Pt缓冲液上生长的具有相对较薄Pt层（__10_）的底部固定IrMn / [Co / Pt]多层膜在室温下显示出良好的垂直交换偏压（PEB）和明确定义的垂直各向异性。然而，即使是最佳的膜也遭受与先前报道的那些相同的问题，即，交换偏压场仅略大于矫顽力。通过将与IrMn接触的Co层替换为6-8 _ Co_（60）Fe_（40）层，可以大大提高交换偏压，同时保持较大的垂直各向异性，并且矫顽力几乎不变。具有足够高的垂直各向异性的IrMn / CoFe / [Pt / Co]薄膜的交换偏置场可以达到高达950 Oe的值，几乎是矫顽力的三倍，并且相应的单向各向异性为0.22 erg cm-2 ，远远超过了以往报道的各种PEB系统在室温下的最佳结果。目前的结果表明，PEB在很大程度上取决于跨界面的铁磁层的组成，这为增强PEB开辟了一条有效途径。

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