A computational method of temperature characteristics of magneto-optical Kerr effect in amorphous TbFeCo films with a multilayered structure

作者：Zou, ZQ^*; Wang, H; Yu, C

来源：Journal of Applied Physics, 2003, 93(9): 5268-5273.

DOI：10.1063/1.1565828

• Magneto-optical Kerr effect (MOKE)

A computational method for evaluating temperature characteristics of the Kerr rotation angle, Kerr ellipticity, and thus the readout signal-to-noise ratio of an amorphous TbFeCo film with a multilayered structure is presented. In this method, a generalized mean-field theory for an n-component system is applied to analyze the temperature dependence of the sublattice magnetizations and the total saturation magnetization of the ternary TbFeCo alloy, and the characteristic matrix method of film optics is adopted to analyze the magneto-optical Kerr effect in the multilayered film. By using this method, the optimum power of the readout laser for a practical magneto-optical disk structure can be determined. As an example, we present a calculation on the Tb0.21Fe0.66Co0.13 quadrilayer disk structure. The result shows that the Kerr rotation angle, Kerr ellipticity, and the readout figure of merit of the quadrilayer structure decrease monotonically with increasing temperature, similar to the variation of Fe sublattice magnetization with the temperature, M-Fe(T). The calculated temperature dependences of the saturation magnetization M-S(T) and the Kerr rotation angle theta(K)(T) are in good accordance with the previous experimental results.

• 出版日期2003-5-1
• 单位上海交通大学