Effect of Ag(Ti) underlayers on CoCrPt thin film media

摘要

The nanocomposite films of CoCrPt/Ag were prepared by DC and RF magnetron sputtering onto glass substrates and subsequent annealing. Magnetic and structure properties of these films have been investigated in detail. Vibrating sample magnetometer(VSM), X-ray diffraction(XRD) and scanning probe microscope (SPM) were applied to study the magnetic properties and microstructure. Magnetic properties such as coercivity(H_c) are strongly dependent on the thickness of Ag and the annealing temperature. When the thickness of Ag underlayer is 20 nm, the coercivity reaches the maximum of 2 200×79.578 A/m. The XRD patterns show that the CoCrPt films are hcp structure lying on the film plane. The SPM images show that small and uniform magnetic grains are isolated by Ag. The effect of Ti underlayer on the magnetic properties is also investigated. These features make CoCrPt/Ag nanocomposite films very attractive for the next-generation of high-density recording.