Abstract Long magnetic relaxation (up to few hours) between stable magnetic states was analyzed in Pt/Co/Ir/Co/Pt/GaAs heterostructures of different Co layers thickness. The experimental data were compared to a large variety of theoretical models amongst which the Fatuzzo-Labrune one seems to be the more relevant. The contributions from domain nucleation and domain wall motion to magnetic relaxation of the spin valves were separated and evaluated. The increase of Co layer thickness suppresses the domain nucleation and enhances the domain wall propagation. The obtained data provide an understanding of the limitations of switching time in the spin valves of large area necessary for GMR biosensors.

中文翻译：

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Co层厚度对Pt/Co/Ir/Co/Pt/GaAs自旋阀磁弛豫的影响

摘要 分析了不同 Co 层厚度的 Pt/Co/Ir/Co/Pt/GaAs 异质结构中稳定磁态之间的长磁弛豫（长达几个小时）。将实验数据与多种理论模型进行了比较，其中 Fatuzzo-Labrune 模型似乎更为相关。分离并评估了畴成核和畴壁运动对自旋阀的磁弛豫的贡献。Co层厚度的增加抑制了畴成核并增强了畴壁传播。获得的数据提供了对 GMR 生物传感器所需的大面积自旋阀中切换时间限制的理解。