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Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.

Titel:	MAGNETIC TAPE AND MAGNETIC RECORDING AND REPRODUCING DEVICE
Link:	Zum Volltext
Veröffentlichung:	2020
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20200227084 Publication Date: July 16, 2020 Appl. No: 16/832284 Application Filed: March 27, 2020 Assignees: FUJIFILM Corporation (Tokyo, JP) Claim: 1. A magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, wherein the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40. Claim: 2. The magnetic tape according to claim 1, wherein the oxide abrasive is an alumina powder. Claim: 3. The magnetic tape according to claim 1, wherein the ferromagnetic powder is a ferromagnetic hexagonal ferrite powder. Claim: 4. 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: 5. The magnetic tape according to claim 1, further comprising a non-magnetic layer containing a non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. Claim: 6. The magnetic tape according to claim 1, further comprising a back coating layer containing a non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Claim: 7. A magnetic recording and reproducing device comprising: the magnetic tape according to claim 1; and a magnetic head. Claim: 8. The magnetic recording and reproducing device according to claim 7, wherein the oxide abrasive is an alumina powder. Claim: 9. The magnetic recording and reproducing device according to claim 7, wherein the ferromagnetic powder is a ferromagnetic hexagonal ferrite powder. Claim: 10. The magnetic recording and reproducing device according to claim 7, wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. Claim: 11. The magnetic recording and reproducing device according to claim 7, wherein the magnetic tape further comprises a non-magnetic layer containing a non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. Claim: 12. The magnetic recording and reproducing device according to claim 7, wherein the magnetic tape further comprises a back coating layer containing a non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Current International Class: 11; 11; 11; 11; 11; 11

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MAGNETIC TAPE AND MAGNETIC RECORDING AND REPRODUCING DEVICE