RECORDING PERFORMANCE OF Co-Cr MEDIA ON CARBON UNDERLAYERS

Magnetic structures in Co-Cr media for perpendicular magnetic recording

High bit densities have been demonstrated in longitudinal as well as in perpendicular magnetic recording. For the latter an area density of more than 12 G b i t / i n 2 has been obtained in a sputtered C o C r T a hard disk with a soft magnetic underlayer recorded with a special single pole head. In this paper the role of microstructure and morphology in relation to the compositional separation...

Scatter Diagram Analysis of Cr Segregation in Co–Cr Based Recording Media

The segregation of Cr in Co–Cr based thin film recording media was measured using energy-filtered TEM images and quantitatively evaluated by the scatter diagram (SD) method. Following a description of such SD analysis it is applied to the measurement of Cr segregation in two CoCrPtB thin film recording media with different Cr contents. Taking the entire data sets into account, the two dimension...

Recording characteristics of perpendicular magnetic media with CoZrNb, NiFeNb, and exchange-pinned NiFeNb soft magnetic underlayers

MgO seed layers for CoCrPt/Cr longitudinal magnetic recording media

Sputter deposited MgO thin films with the B1 crystal structure and ~002! film texture are used as seed layers to improve the texture and magnetic properties of the CoCrPt/Cr magnetic thin films on glass substrates for longitudinal recording. The desired ~002! textured Cr underlayers are usually obtained by sputtering Cr onto heated substrates. However, it is found that the MgO seed layers can i...

Texture evolution in CoCrPtTa/Cr/NiAl magnetic recording media

Crystallographic textures in a CoCrPtTa/Cr/NiAl multilayer magnetic recording media were studied by electron diffraction. It was found that texture quality evolves through the thickness of the films. A large improvement of texture quality was discovered at the interface of the Cr and NiAl layers. Surprisingly, there remains a portion of randomly oriented grains in the CoCrPtTa layer, in additio...