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提出了一个讨论铁磁 /反铁磁双层膜中的交换偏置及矫顽场温度特性的物理模型 ,该模型 ,假设铁磁层为具有单轴各向异性的单畴膜而反铁磁层由许多相互独立具有多晶各向异性的颗粒组成 ,其温度依赖性主要来源于系统态的热不稳定 ,包括反铁磁颗粒易轴取向的热涨落和相关磁学量的温度依赖性等 .计算结果表明其交换偏置随温度的增加非线性地减少而其矫顽场在体阻截温度处达极大值 ,且其体阻截温度随反铁磁颗粒粒径的增加而增加 .我们的计算结果和相关实验结果一致 .通过本文的讨论 ,我们建议通过铁磁膜耦合上大粒径硬反铁磁颗粒膜可获得高交换偏置、低矫顽场且近独立于温度的相关磁学器件
A physical model was proposed to discuss the exchange bias and temperature characteristics of the coercive field in a ferromagnetic / antiferromagnetic bilayer membrane. The model assumes that the ferromagnetic layer is a uniaxial anisotropic monodomain and the antiferromagnetic The layer consists of a number of particles which are independent of each other and have polycrystalline anisotropy. The temperature dependence of the layer mainly comes from the thermal instability of the system state, including the temperature dependence of the thermal fluctuation of the easy axis orientation of the antiferromagnetic particles and the related magnetism Etc. The calculated results show that the exchange bias decreases non-linearly with the increase of temperature and the coercive field reaches the maximum at the body-stop temperature, and the body-temperature blocking temperature increases with the increase of anti-ferromagnetic particle size. The calculation results are in good agreement with the relevant experimental results.We propose that high exchange bias, low coercive field and near independent magnetic temperature can be obtained by ferromagnetic film coupled with large size hard antiferromagnetic particles Learn devices