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Disk Noise of Quadrilayer MnBi Magneto-Optical Disks
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Disk noise of quadrilayer MnBi magneto-optical disks with grooved glass substrates
was investigated. Both reflectivity noise and polarization noise of MnBi disks were
20 dB higher than those of TbFeCo disks. The degree of c-axis orientation of a
hexagonal MnBi layer, which is inversely proportional to fluctuation in the magnetization
direction, and Mn oxide in a MnBi layer are not dominant origins of the high disk noise.
Bi layers 20 nm in thickness on grooved substrates have many hillocks over 50 nm in
height at land edges. Noise reduction of 10 dB can be achieved by using a flat glass
substrate. Surface roughness on the Bi layers is one of the main causes of high disk noise of MnBi disks.
Title: Disk Noise of Quadrilayer MnBi Magneto-Optical Disks
Description:
Disk noise of quadrilayer MnBi magneto-optical disks with grooved glass substrates
was investigated.
Both reflectivity noise and polarization noise of MnBi disks were
20 dB higher than those of TbFeCo disks.
The degree of c-axis orientation of a
hexagonal MnBi layer, which is inversely proportional to fluctuation in the magnetization
direction, and Mn oxide in a MnBi layer are not dominant origins of the high disk noise.
Bi layers 20 nm in thickness on grooved substrates have many hillocks over 50 nm in
height at land edges.
Noise reduction of 10 dB can be achieved by using a flat glass
substrate.
Surface roughness on the Bi layers is one of the main causes of high disk noise of MnBi disks.
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