Theoretic 3-D study of the high-frequency magnetic moment dynamics in thin ferromagnetic films with in-plane uniaxial anisotropy by considering eddy-current generation

详细信息	查看全文 | 推荐本文 |

• 作者：K. Seemann ; ^{klaus.seemann@kit.edu} ; H. Leiste ; K. Krü ; ger
• 关键词：Ferromagnetic thin film ; Theory of ferromagnetic polarisation dynamic ; Ferromagnetic resonance ; Macro spin trajectory ; Landau&ndash ; Lifschitz&ndash ; Gilbert and Maxwell differential equations
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：June, 2012
• 卷：324
• 期：11
• 页码：1926-1932
• 文件大小：2134 K

摘要

In the present paper, theoretic investigations of polarisation vector precession trajectories represented by a macro spin in ferromagnetic films with in-plane uniaxial anisotropy were realised. For this purpose, the Landau-Lifschitz-Gilbert differential equation (LLG) in combination with the Maxwell equations were solved for three dimensions by considering a linear progression of the magnetisation or polarisation with an external field. The frequency and time dependent polarisation trajectories illustrate how a magnetic moment precesses if effective damping and eddy-currents impacts its motion. For computation, typical parameter values like the saturation polarisation J_s=渭₀路M_s=1.4 T and in-plane uniaxial anisotropy 渭₀路H_u=4.5 mT were employed. The main focus of simulation was on the variation of the effective damping parameter 伪_eff between 0.01 and 0.05 and ferromagnetic film thickness t_m between 200 nm and 1200 nm. The frequency-dependent calculations were carried out between 50 MHz and 6 GHz. The time-dependent simulations were done for a duration between 5 and 30 ns.