Recording properties of Co/Pd multilayer using a magnetoresistive sensor

Abstract

We have fabricated Co/Pd, CoCr/Pd, and CoCrTa/Pd multilayer media. Good recording performance was achieved using a magnetoresistive (MR) head for readback. Co/Pd medium has perpendicular coercivity of 5 kOe and perpendicular squareness ratio of 0.83. The recording performance of a Co/Pd multilayer media was compared to conventional longitudinal media Co86Cr10Ta4 media and perpendicular Co78Cr17Ta5 media. The effects of Cr doping of Co, postdeposition annealing of Co/Pd, annealing the plated NiFe keeper layer, the number of layers in the multilayer, and the oxygen concentration of sputtering gas on the noise spectra of media were studied.

Electrochemical Synthesis of Metal Alloys for Magnetic Recording Systems

“…Cobalt-palladium multilayered film [52][53][54][55][56][57][58][59][60][61][62][63][64][65] is a potential material for a perpendicular magnetic recording layer since it has a perpendicular squareness ratio of unity because of its high perpendicular magnetic anisotropy [53]. The suppression of intergranular exchange coupling is significant for improving the read-write (R/W) characteristics of a Co/Pd multilayered medium with a soft magnetic underlayer (SUL).…”

Reduction of medium noise of co-pd multilayered perpendicular magnetic recording media by a thin carbon interlayer

“…Many studies have been carried out to decrease the intergranular exchange coupling. For example, a sputtering process for fabricating the [Co-Pd] multilayered film using high-Ar gas pressure [2], the addition of other elements to the multilayer such as Cr-Ta [3] Manuscript received August 22, 2002; revised October 22, 2002. This work was supported by the Center of Excellence Research on "Establishment of Molecular Nano-Engineering by Utilizing Nanostructure Arrays and its Development into Micro-System" from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.…”