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Magnetic recording medium having a dimensional variation

專(zhuān)利號(hào)
US10867630B2
公開(kāi)日期
2020-12-15
申請(qǐng)人
Sony Corporation（JP Tokyo）
發(fā)明人
Noboru Sekiguchi; Minoru Yamaga
IPC分類(lèi)
G11B5/62; G11B5/733; G11B5/706; C23C14/00; G11B5/735
技術(shù)領(lǐng)域
recording,magnetic,layer,medium,in,σmd,δw,nm,or,average
地域： Tokyo

摘要

The average thickness tT of a magnetic recording medium meets the requirement that tT≤5.5 [μm], and the dimensional change amount Δw in the width direction of the magnetic recording medium with respect to the tension change in the longitudinal direction of the magnetic recording medium meets the requirement that 700 ppm/N≤Δw.

說(shuō)明書(shū)

The Ru contained in the second base layer 132B has the same hexagonal close-packed lattice structure as Co which is a main constituent of the recording layer 115. For this reason, Ru has the effect of achieving a balance between the improved crystal orientation of the recording layer 115 and the promoted granularity. Furthermore, in order to further improve the crystal orientation of the Ru contained in the second base layer 132B, the first base layer 132A and the seed layer 131 are provided under the second base layer 132B. For the magnetic recording medium 130 according to the third embodiment, the first base layer 132A containing inexpensive CoO that has a face-centered cubic lattice structure achieves a substantially similar effect (function) to that of the second base layer 132B containing Ru. For this reason, the thickness of the second base layer 132B can be reduced. Furthermore, in order to enhance the crystal orientation of the first base layer 132A, the seed layer 131 containing Cr, Ni, and Fe is provided.

EXAMPLES

The present disclosure will be specifically described with reference to examples, but the present disclosure is not to be considered limited to only these examples.

權(quán)利要求

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