Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film
Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film
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DOI：
10.1063/1.4792740
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发表时间：
2013-02
影响因子：
4
通讯作者：
M. K. Marcham;W. Yu;P. Keatley;L. Shelford;P. Shafer;S. Cavill;H. Qing;A. Neudert;J. Childress;J. Katine;E. Arenholz;N. Telling;G. Laan;R. Hicken
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文献类型：
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作者：
M. K. Marcham;W. Yu;P. Keatley;L. Shelford;P. Shafer;S. Cavill;H. Qing;A. Neudert;J. Childress;J. Katine;E. Arenholz;N. Telling;G. Laan;R. Hicken
通过低温时间分辨磁光克尔效应和相位分辨X射线铁磁共振测量，探索了Co50Fe50(0.7)/Ni90Fe10(5)/Dy(1)/Ru(3)（厚度以nm为单位）薄膜的进动动力学。当温度从 300 K 降低到 140 K 时，磁阻尼迅速增加，而共振场却大大降低。静态 X 射线磁圆二色性测量表明，与 Co50Fe50/Ni90Fe10 反平行的 Dy 矩铁磁序不断增加。 Dy 轨道矩与进动自旋磁化强度耦合的增加导致薄膜的阻尼和旋磁比显着增加，同时保持其磁各向异性有效不变。
Precessional dynamics of a Co50Fe50(0.7)/Ni90Fe10(5)/Dy(1)/Ru(3) (thicknesses in nm) thin film have been explored by low temperature time-resolved magneto-optical Kerr effect and phase-resolved x-ray ferromagnetic resonance measurements. As the temperature was decreased from 300 to 140 K, the magnetic damping was found to increase rapidly while the resonance field was strongly reduced. Static x-ray magnetic circular dichroism measurements revealed increasing ferromagnetic order of the Dy moment antiparallel to that of Co50Fe50/Ni90Fe10. Increased coupling of the Dy orbital moment to the precessing spin magnetization leads to significantly increased damping and gyromagnetic ratio of the film while leaving its magnetic anisotropy effectively unchanged.