自旋电子器件中，适当大的磁化动力学阻尼因子有利于缩短器件的开关时间，铁族软磁薄膜作为自旋电子学的基本材料，其磁化阻尼因子的研究尤为重要。与铁族过渡金属不同，稀土元素的轨道矩未被淬灭。加入稀土元素，可以增强铁族金属或合金薄膜的自旋-轨道相互作用，进而达到改善其磁化动力学阻尼因子的目的。然而稀土元素的加入往往由于其与过渡族金属的反铁磁耦合或非晶化导致薄膜饱和磁化强度的降低，严重影响其实际应用价值。本课题申请的目的就是在改善铁族薄膜磁化阻尼因子的同时使其保持较高的磁化强度。有研究表明稀土元素的磁矩和Fe的磁矩都可以实现与Cr呈反平行排列。因此本次申请的主要内容是在铁族金属或合金薄膜与稀土薄膜中加入一层薄膜Cr，通过改变Cr层的厚度，实现铁族金属或合金的磁矩与稀土呈平行排列；同时研究薄膜的磁性，重点利用铁磁共振模拟研究共振线宽与磁化动力学阻尼因子的关系。

The magnetization dynamic damping which may reduce the magnetization switching time in spintronics devices is important, especially for the Fe-based soft films. Different from the transition metals (TM), the orbital moment of the rare-earth (RE) elements is not quenched which may increase the magnetization damping constant by enhancing the spin-orbit interaction.While the saturation magnetization is always decreased because of the antiparallel alignment between the RE atomic moments and TM moments or amorphization which is seriously impact the value of application. The main purpose of the research is to increase the magnetization damping constant with higher saturation magnetization. It has been reported that RE-metal moments couple antiferromagnetically with Cr and Cr in turn couples antiferromagnetically with Fe. Hence, One of the main contents of the research is to achieve an effective ferromagnetic coupling between the RE-metal and the TM magnetic moments by insert a Cr film with proper thickness between them.The other is to study the magnetic properties of the films especially the relation between ferromagnetic resonance linewidth and magnetization dynamic damping constant by the ferromagnetic resonance.