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In this work, CoPtCr-oxide films were deposited with three types of oxide additives(Si-O, Cr-O, Ti-O). Their magnetic, grain morphological properties and oxidation kinetics were systematically studied by varying oxygen reactive sputter conditions and were correlated with PMR performance. CoPtCr-oxide media has been reported to have small grains with good magnetic decoupling for perpendicular recording...
In this work, Fe65Co35 alloy which has maximum saturation magnetization (Ms) among all metal magnetic materials was chosen to make Fe65Co35-SiO2 granular films, and the magnetic properties in whole composition were studied. The results show that good high frequency soft magnetic films were obtained by carefully controlling the microstructure. A serious (Fe65Co35)x(SiO2)1-x granular films are fabricated...
In this paper, we introduce the unique newly material, the hcp disordered Co-Ir alloy with negative uniaxial magnetic anisotropy, and propose a new concept of the ECC media using this new CoIr-SiO2 granular film instead of conventional soft layer material. In real magnetic writing, negative-Kugrain part plays a role of SUL function. Co-Ir alloys with negative-Kugrain shows soft magnetism in the...
In this presentation, the magnetic properties and electronic structure of Cr incorporated SiC(100) surface, including the surface formation energy and the surface electronic structure, was extensively investigated using ab initio calculations. the surfaces of p(2times1) and c(4times2)-AUDD were employed to simulate the Si-terminated SiC(100) surface, and the c(2times2) was prepared to calculate the...
CoCrPt-SiO2-based perpendicular recording medium with a crystalline soft underlayer (c-SUL). Low Deltathetas50 of about 3 deg with a thin intermediate layer of 5 nm has been made in this media. In this paper, we report the orientation improvement, noise reduction of c-SUL and recording performance of the media. The magnetic properties and microstructure were characterized by magneto-optic Kerr effect...
In this paper, recording performance of the CoPtCr-SiO2 media is investigated by using contact-type cusp-field single-pole write head. The relationship between the microstructure of the storage layer and the recording performance is discussed.
In this paper, a CoCrPt-SiO2 based recording media with reduced Ru interlayer thickness was investigated. The Ta seedlayer, Ru interlayer and magnetic layer were deposited by DC magnetron sputtering on cover glass substrates. Magnetic properties were tested using a vibrating sample magnetometer; interface morphology was examined by X-ray reflectivity and atomic force microscopy; and film orientation...
This work focuses on the effect of deposition rate in the longitudinal version of this materials system. Since two phase segregation must occur during the sputter deposition process, it is anticipated that deposition rate may be a crucial deposition parameter, and that high deposit rates may not allow this segregation to proceed to completion in each layer of the depositing film before being buried...
To improve recording density of magnetic tape systems, CoPtCr based sputtered media have been investigated, which achieved coercivity of 2600 Oe higher than conventional Co-CoO obliquely evaporated media. Recently, SiO2 added CoPtCr granular media, which are largely researched for perpendicular recording media, have also showed beneficial effects on enhancing isolation and fine structure of magnetic...
In this study, it is successfully demonstrated drive level removable flexible disk drive (FDD) areal densities of 17.5 Gbits/in2 and 31 Gbits/in2 using barium ferrite (BaFe) particulate FD media and CoPtCr-SiO2 sputtered FD media respectively, along with hard disc drive (HDD) type GMR heads, a modern PRML read channel and robust ECC.
The authors measured the remanent magnetization curves for a series of CoPtCr-SiO2 perpendicular media with various thickness at low and high applied field sweep rates. They discussed the "intrinsic" switching field distribution (SFD) caused by the variations in the grain-to-grain switching field. Magnetic analysis revealed the values of the saturation magnetization and the uniaxial magnetic...
In the present study, the switching field distribution (SFD) of the Tb/Pt/Ru/CoPtCr-SiO2 perpendicular media has been studied in relation to the Ar pressure at which the recording layer was deposited. The goal of the present study is to correlate the SFDs of the Tb/Pt/Ru/CoPtCr-SiO2 media with their intergranular exchange coupling and their grain size distribution.
The perpendicular media investigated employed silicon oxide in the recording layer to facilitate grain segregation, as reported. Overcoat used for these studies includes sputtered CNx, SiNx and ion beam carbon. Method for corrosion assessment includes (1) ICP-MS measurement of extractable Co, (2) Electrochemical polarization curve, and (3) Temperature and Relative Humidity (T&RH) condensation...
In this study, the spatial distribution of MSF in CoCrPt-Si02 granular perpendicular recording medium and CoCrPt patterned medium are reported. MFM images were observed with a SPA300HV scanning probe microscope coupled to an electromagnet producing a controllable perpendicular magnetic field of up to 10 kOe in a vacuum. The diameter of the cutting edge of the probe tip was less than 30 nm. Measurement...
In this paper, we have determined the values of the internal stresses induced on the radial, azimuthal and axial directions during dc Joule heating. We have calculated the internal stresses and magnetic domain structures for five samples considered as being representative cases. These stresses are owing to the successive heating, crystallization and cooling of the metal as well as to contractions...
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