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在室温下利用直流磁控溅射法制备出了具有不同Co层厚度的 [Co(dConm) /Ti(dTinm) ]n 金属磁性多层膜 (其中dCoanddTi是Co和Ti的厚度 ,n薄膜调制周期数 )。在 30 0K下用X射线衍射法 (XRD)和布里渊散射方法研究了Co层厚度分别为dCo=1 ,2 ,2 5 ,3 5nm ,Ti层厚度为dTi=2 5nm的Co/Ti多层膜。XRD的结果所示在Co/Ti多层膜中Co层厚度超过 2 5nm ,其结构类似块材Co的多晶结构。对比之下 ,Co/Ti多层膜中Co层厚度低于 2 5nm ,其XRD衍射峰随Co层厚度减少变的峰形加宽 ,衍射峰的强度减少 ,峰位移动和消失。在Co/Ti多层膜中自旋波的布里渊散射结果表明 :在Co/Ti多层膜中 ,对于dCo>2 5nm磁性呈铁磁性耦合 ,在dCo≤ 2 5nm时 ,其呈反铁磁性耦合。除表面自旋波外 ,在呈反铁磁性耦合的材料中观测到了两个有体特征的自旋波 ,而在呈铁磁耦合的材料中只观测到一个有体特征的自旋波。
[Co (dConm) / Ti (dTinm)] n metal magnetic multilayers with different Co layer thicknesses (where dCoanddTi is the thickness of Co and Ti, n is the thickness of the thin film, number). The Co / Ti multilayer with dCo = 1, 2, 25, 35 nm and Ti layer thickness dTi = 25 nm were respectively investigated by X-ray diffraction and Brillouin scattering at 30 0K. membrane. The result of XRD shows that the thickness of the Co layer in the Co / Ti multilayer film exceeds 25 nm and is similar to the polycrystalline structure of bulk Co. In contrast, the thickness of Co layer in Co / Ti multilayers is less than 25 nm. The XRD peaks broaden as the Co layer thickness decreases, and the intensity of the diffraction peaks decreases and the peak positions shift and disappear. The Brillouin scattering results of spin waves in Co / Ti multilayered films show that in Co / Ti multilayers, ferromagnetic coupling for dCo> 25nm is ferromagnetic, and for dCo≤25nm, Magnetic coupling. In addition to the surface spin waves, two spin-waves with bulk features are observed in the anti-ferromagnetic coupled material, whereas only one spin-wave with bulk features is observed in the ferromagnetically-coupled material.