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The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.

Titel:	MAGNETIC TAPE HAVING CHARACTERIZED MAGNETIC LAYER AND MAGNETIC RECORDING AND REPRODUCING DEVICE
Link:	Zum Volltext
Veröffentlichung:	2021
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20210358521 Publication Date: November 18, 2021 Appl. No: 17/386616 Application Filed: July 28, 2021 Assignees: FUJIFILM Corporation (Tokyo, JP) Claim: 1. A magnetic tape comprising: a non-magnetic support; a magnetic layer including ferromagnetic powder on the non-magnetic support; and a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer, wherein a thickness of the non-magnetic layer is 0.1 μm to 1.5 μm, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40. Claim: 2. The magnetic tape according to claim 1, wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. Claim: 3. The magnetic tape according to claim 1, wherein the C—H derived C concentration is 45 atom % to 80 atom %. Claim: 4. The magnetic tape according to claim 1, wherein the C—H derived C concentration is 45 atom % to 70 atom %. Claim: 5. The magnetic tape according to claim 1, wherein the thickness of the non-magnetic layer is 0.1 μm to 1.0 μm. Claim: 6. The magnetic tape according to claim 1, wherein the thickness of the non-magnetic layer is 0.1 μm to 0.7 μm. Claim: 7. The magnetic tape according to claim 1, further comprising: a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Claim: 8. A magnetic recording and reproducing device comprising: the magnetic tape according to claim 1; and a magnetic head. Current International Class: 11; 11; 11; 11; 11; 11; 11; 11

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MAGNETIC TAPE HAVING CHARACTERIZED MAGNETIC LAYER AND MAGNETIC RECORDING AND REPRODUCING DEVICE