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Magnetic recording medium having a dimensional variation

專利號(hào)
US10867630B2
公開日期
2020-12-15
申請(qǐng)人
Sony Corporation（JP Tokyo）
發(fā)明人
Noboru Sekiguchi; Minoru Yamaga
IPC分類
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.

說明書

First, the configuration of a magnetic recording medium 10 according to the first embodiment will be described with reference to FIG. 1. The magnetic recording medium 10, which is a vertical magnetic recording-type magnetic recording medium, includes, as shown in FIG. 1, an elongated substrate 11, an base layer (nonmagnetic layer) 12 provided on one main surface of the substrate 11, a recording layer (magnetic layer) 13 provided on the base layer 12, and a back layer 14 provided on the other main surface of the substrate 11. Note that the back layer 14 is provided as necessary, and may be omitted. Hereinafter, of the main surfaces of the magnetic recording medium 10, the surface on the side with the recording layer 13 provided is referred to as a magnetic surface, and the opposite surface on the side with the back layer 14 provided is referred to as a back surface.

The magnetic recording medium 10 has an elongated shape, and runs in the longitudinal direction for recording/reproducing. Furthermore, the magnetic recording medium 10 is configured to be capable of recording a signal at a shortest recording wavelength of preferably 100 nm or less, more preferably 75 nm or less, still more preferably 60 nm or less, particularly preferably 50 nm or less, and used for, for example, a recording/reproducing device that has a shortest recording wavelength in the range mentioned above. This recording/reproducing device may include a ring-type head as a recording head. The recording track width is, for example, 2 μm or less.

(Substrate)

權(quán)利要求

1
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