Damping at normal metal/permalloy interfaces
Damping at normal metal/permalloy interfaces
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DOI：
10.1109/tmag.2005.854956
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发表时间：
2005-10
影响因子：
2.1
通讯作者：
J. Rantschler;B. Maranville;J. Mallett;P. Chen;R. McMichael;W. Egelhoff
中科院分区：
文献类型：
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作者：
J. Rantschler;B. Maranville;J. Mallett;P. Chen;R. McMichael;W. Egelhoff
我们通过测量所有系列的铁磁共振 (FMR) 线宽并校正外在展宽效应，确定了六组具有普通金属 (NM)/坡莫合金 (NiFe) 或 NM/NiFe/NM 结构的样品中的吉尔伯特阻尼参数作为层厚度的函数。在 NM/NiFe 样品中，我们发现增加界面粗糙度会以二次方的方式增加阻尼，从 3 nm 处的 0.01 增加到 47 nm 处的 0.11，并且通过控制铜层的粗糙度，我们发现没有证据表明铜层厚度在 100-2050 nm 之间会导致阻尼增加。
We have determined the Gilbert damping parameter as a function of layer thickness in six sets of samples with either a normal metal (NM)/Permalloy (NiFe) or NM/NiFe/NM structure by measuring the ferromagnetic resonance (FMR) linewidth for all series and correcting for extrinsic broadening effects. In the NM/NiFe samples, we find that increasing the interface roughness increases the damping quadratically from 0.01 at 3 nm to 0.11 at 47 nm, and by controlling the roughness of the copper layer, we have found there is no evidence of increased damping due to the thickness of the copper layer between 100-2050 nm of copper.