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MAGNETIC TAPE DEVICE, MAGNETIC REPRODUCING METHOD, AND HEAD TRACKING SERVO METHOD

  • US 20190051325A1
  • Filed: 10/15/2018
  • Published: 02/14/2019
  • Est. Priority Date: 03/29/2017
  • Status: Active Grant
First Claim
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1. A magnetic tape device comprising:

  • a magnetic tape; and

    a reproducing head,wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,a C—

    H derived C concentration calculated from a C—

    H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, andΔ

    SFD in a longitudinal direction of the magnetic tape calculated by Expression 1 is equal to or smaller than 0.50,
    Δ

    SFD=SFD25°

    C.


    SFD


    190°

    C.




    Expression 1in Expression 1, the SFD25°

    C.
    is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25°

    C., and the SFD

    190°

    C.
    is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of −

    190°

    C.

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