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MAGNETIC TAPE AND MAGNETIC RECORDING AND REPRODUCING DEVICE

  • US 20190103130A1
  • Filed: 09/27/2018
  • Published: 04/04/2019
  • Est. Priority Date: 09/29/2017
  • Status: Active Grant
First Claim
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1. A magnetic tape comprising:

  • a non-magnetic support; and

    a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,wherein Δ

    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 1,in Expression 1, the SFD25°

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

    190°

    C.,the magnetic layer includes an oxide abrasive,a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, andan average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μ

    m to 0.08 μ

    m.

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