Preparation And Flipping Mode Of The Perpendicular Magnetic Recording Media Materials Research

Nowadays, date storage has been progressing into a high level based on the great developing of information technology and internet systems.HDD has become the most important part of data storage industry and increasing the magnetic recording density is the best way to accommodate the information technology. Researching on high density magnetic recording concerns on both media materials and head technology. Till now, the recording technology has been changed from horizontal magnetic recording to perpendicular magnetic recording and its density has reached 614.4 Gbit/in2 in the laboratory. New technology should be induced to reach the limitation of perpendicular recording density which is 1-1.5Tbit/in2.The super-paramagnetic effect is the fundamental factor limiting the achievement of the goal. In order to conquer super-paramagnetic effect, it is necessary to explore new materials with high magneto-crystalline anisotropy. Exploring new materials and changing the properties of the materials we already have is the purpose of our study.As the following, we summarize the main contents and results in this thesis.I MnAl multilayer:τ-MnAl has a magneto-crystalline anisotropy as high as 1.7×107 erg/cm3.It can be used as a candidate material in magnetic recording or devices. In two ways, we improve the magnetic properties of MnAl. Firstly, wedge-shaped multilayer has been used to investigate the appropriate portions of Mn and Al. The connection between magnetic grains and the magnetization reversal process was also investigated. Second, a buffer layer is used to induce the nucleation and growth of ferromagnetic phase. Theτ-MnAl with great magnetic properties has been prepared.II ECC media and Graded media:L10-FePt has large magneto-crystallize anisotropy which is good for thermal stability but bad for writability. In order to reduce the coercivity without lacking thermal stability, we have investigated exchange coupled composite media (ECC) and graded media. Fe layer and Co layer were deposited after the L10-FePt layer to form the ECC and graded media. The samples showed better magnetic properties with lower coercivity. All the samples have large squareness ratio along normal direction. Two magnetization reversal models are discussed. Domain wall motion model is revealed in our ECC samples.