Static and dynamic magnetic properties of bcc Fe49Co49V2 thin films on Si(100) substrates
Static and dynamic magnetic properties of bcc Fe49Co49V2 thin films on Si(100) substrates
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DOI：
10.1088/0022-3727/46/49/495002
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发表时间：
2013-12-11
影响因子：
3.4
通讯作者：
Svedlindh, P.
中科院分区：
文献类型：
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作者：
Wei, Y.;Brucas, R.;Svedlindh, P.
采用直流磁控溅射的方法，在室温~ 600℃的Si（1 00）衬底上生长了Fe49Co49V2薄膜，利用超导量子干涉仪和磁光克尔效应磁强计研究了薄膜的静态磁性能，并用x射线衍射和反射率测量对制备的样品的结构性能和厚度进行了评价。易轴矫顽力从室温下生长的60 Oe降低到400℃下生长的15 Oe。我们还利用高频矢量网络分析仪（FMR）技术研究了样品的动态磁性。FMR测量结果表明，当生长温度达到450℃时，外源线宽随生长温度的升高而减小，然后随生长温度的进一步升高而增大。外部线宽的来源是由小而弱的非均匀性引起的双磁振子散射。本征吉尔伯特阻尼（alpha）遵循与外在线宽相似的趋势，在生长温度为450℃时，发现的最低阻尼常数alpha接近0.005。
Thin films of Fe49Co49V2 have been grown on Si(1 0 0) substrates by dc magnetron sputtering varying the substrate temperature in the range from room temperature (RT) to 600 degrees C. The static magnetic properties of the films were studied using a superconducting quantum interference device and magneto-optic Kerr effect magnetometry, while x-ray diffraction and reflectivity measurements have been used for the evaluation of the structural properties and thickness of the prepared samples. The easy axis coercivity decreases from 60 Oe for the sample grown at RT to 15 Oe for the one grown at 400 degrees C. We also studied the dynamic magnetic properties of the samples by using the high-frequency vector network analyser ferromagnetic resonance (FMR) technique. Results from FMR measurements show that the extrinsic linewidth decreases with increasing growth temperature up to 450 degrees C and then increases with further increase of growth temperature. The source of the extrinsic linewidth is two-magnon scattering by small, weak inhomogeneities. The intrinsic Gilbert damping (alpha) follows a similar trend to the extrinsic linewidth, with the lowest damping constant alpha approximate to 0.005 found at a growth temperature of 450 degrees C.