Temperature dependence of interlayer coupling between perpendicular magnetic [CoFeB/Pd] multilayers: Influence of interfacial CoFeB layer

Yili Xiao; Zongzhi Zhang; Bin Ma; Q. Y. Jin; Yaowen Liu

doi:10.1063/1.4865803

Temperature dependence of interlayer coupling between perpendicular magnetic [CoFeB/Pd] multilayers: Influence of interfacial CoFeB layer

Yili Xiao, Zongzhi Zhang, Bin Ma, Q. Y. Jin, Yaowen Liu

Electrical and Computer Engineering

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Abstract

Temperature dependence of interlayer coupling field in the perpendicular antiferromagnetic structure of [Pd/CoFeB]₂/Pd/CoFeB(t _CFB)/Ru(t_Ru)/CoFeB(t_CFB)/Pd/[CoFeB/Pd] ₂ is found to be sensitive to t_CFB, showing various non-monotonic behaviors. The coupling strength increases with t_CFB, reaching bulk-like value of up to 0.28 erg/cm² at room temperature as t_CFB is over 0.6 nm. We attribute the phenomena to interfacial effects, including lowered Curie temperature in ultrathin CoFeB layers and increased effective dead layer thickness. The coupling peak position of t _Ru also shifts with temperature and t_CFB, corresponding to variations in dead layer thicknesses. These effects should be considered when designing practical devices employing perpendicular synthetic antiferromagnetic structures.

Original language	English (US)
Article number	072403
Journal	Applied Physics Letters
Volume	104
Issue number	7
DOIs	https://doi.org/10.1063/1.4865803
State	Published - Feb 17 2014

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abstract = "Temperature dependence of interlayer coupling field in the perpendicular antiferromagnetic structure of [Pd/CoFeB]2/Pd/CoFeB(t CFB)/Ru(tRu)/CoFeB(tCFB)/Pd/[CoFeB/Pd] 2 is found to be sensitive to tCFB, showing various non-monotonic behaviors. The coupling strength increases with tCFB, reaching bulk-like value of up to 0.28 erg/cm2 at room temperature as tCFB is over 0.6 nm. We attribute the phenomena to interfacial effects, including lowered Curie temperature in ultrathin CoFeB layers and increased effective dead layer thickness. The coupling peak position of t Ru also shifts with temperature and tCFB, corresponding to variations in dead layer thicknesses. These effects should be considered when designing practical devices employing perpendicular synthetic antiferromagnetic structures.",

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T2 - Influence of interfacial CoFeB layer

AU - Xiao, Yili

AU - Zhang, Zongzhi

AU - Ma, Bin

AU - Jin, Q. Y.

AU - Liu, Yaowen

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Temperature dependence of interlayer coupling between perpendicular magnetic [CoFeB/Pd] multilayers: Influence of interfacial CoFeB layer

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