AFM探针热磁写入中薄膜温度场的有限元模拟

Finite Element Simulation of the Thermal Filed in Magnetic Film Using AFM Heat Assisted Recording Tip Writing

针对光磁混合记录中微区热磁写入方式,提出利用原子力显微镜(AFM)内的显微探针将激光热源导入磁性薄膜,并采用有限元方法对TbFeCo磁性薄膜温度场进行模拟。模拟结果表明:磁性薄膜中,高于居里温度的区域范围与原子力探针针尖直径、薄膜厚度、激光能量之间存在紧密的关系。高于居里温度的区域范围随针尖直径呈线性增大,随薄膜厚度的增高而减小,在薄膜厚度超过15nm后趋于稳定。

In this paper, a heat transfer model was developed and finite element method was used to calculate the temperature distribution in the magnetic film on a glass substrate by AFM tip transferring heat. The results indicated that the size of heated spot above Curie temperature in the TbFeCo magnetic film is closely related to the thickness of the film, the diameter of the tip, and the power of the laser pulse. The heated spot size in the magnetic film is proportional to the power of the laser pulse and the diameter of the tip, and decreases with aggrandizement of the thickness of the film and does not change if the thickness of the film is above 15nm.