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MAGNETIC TAPE DEVICE AND MAGNETIC REPRODUCING METHOD

  • US 20180286442A1
  • Filed: 03/14/2018
  • Published: 10/04/2018
  • 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 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, a binding agent, and fatty acid ester on the non-magnetic support,the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm, anda difference Safter

    Sbefore between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured by optical interferometry regarding the surface of the magnetic layer before performing the vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 8.0 nm.

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