Ultra-thin Fe-Pt films of perpendicular composite media were studied. It was found that a preparation condition at a temperature of 375 C and introduction of an exchange-decoupling layer between the Fe-Pt layer and the soft-magnetic underlayer led to reduction of the initial growth layer of the Fe-Pt film. A 5 nm thick Fe-Pt medium exhibited a high SNR and a high recording resolution with high thermal stability.

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Abstract-Correlation of the medium noise and the recording properties to the macroscopic M-H loops were studied for perpendicular recording media. A simple analysis of medium noise based on particulate noise source was proposed. The analysis well explained experimental results, and suggested a significant role of SQ.L along with magnetic domain size on the noise and SIN. The M-H loop for low noise media with a high output and a high resolution was also proposed.

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Perpendicular magnetic recording media with a high resolution and a low noise property were studied using a micromagnetic simulation. It was suggested that the introduction of a small separation between the adjacent grains is effective to obtain such media increasing the perpendicular M-H loop slope without increasing the domain size. The separation is thought to reduce the demagnetizing field acting on the magnetic grains increasing the M-H loop slope of the grains.