摘要
FePt granular films were prepared by direct current facing-target magnetron sputtering system onto glass substrates and subsequently in-situ annealed in vacuum. Vibrating sample magnetometer, X-ray diffraction and scanning probe microscope were applied to study the magnetic properties, microstructures, morphologies and domain structures of the samples. (FePt)27Ti73 bilayer films were fabricated at various conditions to investigate the effect of Ti on FePt grains. The results show that without Ti matrix layer, FePt films deposited onto the glass substrates are fcc disordered; with addition of Ti matrix layer, FePt/Ti films form a ternary (FePt)27Ti73 alloy possessing fcc and L10 (111) mixed texture. FePt/(FePt)27Ti73 films with perfectly ordered L10(111) structure and unique magnetic properties can be obtained at Ti thickness of 35nm and substrate temperature of 250℃. The maximum coercivity is more than 240kA/m and the squareness ratio is more than 0.9. The obtained results suggest that the granular FePt/(FePt)27Ti73 films can be applicable to ultrahigh-density magnetic recording media.
FePt granular films were prepared by direct current facing-target magnetron sputtering system onto glass substrates and subsequently in-situ annealed in vacuum. Vibrating sample magnetometer, X-ray diffraction and scanning probe microscope were applied to study the magnetic properties, microstructures, morphologies and domain structures of the samples. (FePt)_(27)Ti_(73) bilayer films were fabricated at various conditions to investigate the effect of Ti on FePt grains. The results show that without Ti matrix layer, FePt films deposited onto the glass substrates are fcc disordered; with addition of Ti matrix layer, FePt/Ti films form a ternary (FePt)_(27)Ti_(73) alloy possessing fcc and L1_0 (111) mixed texture. FePt/(FePt)_(27)Ti_(73) films with perfectly ordered L1_0(111) structure and unique magnetic properties can be obtained at Ti thickness of 35nm and substrate temperature of 250℃. The maximum coercivity is more than 240kA/m and the squareness ratio is more than 0.9. The obtained results suggest that the granular FePt/(FePt)_(27)Ti_(73) films can be applicable to ultrahigh-density magnetic recording media.
基金
Project(10274018) supported by the National Natural Science Foundation of China
project(Z200102) supported the KeyFoundation of Hebei Normal University
project(2002116) supported the Foundation Education Department of of Hebei Provin
关键词
显微结构
FePt磁层
表面磁控管溅射
磁记录媒介
FePt magnetic layer
ordered L1_0 structure
facing-target magnetron sputtering system
magnetic (recording) media