MAGNETIC TAPE DEVICE, MAGNETIC REPRODUCING METHOD, AND HEAD TRACKING SERVO METHOD
First Claim
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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Accused Products
Abstract
Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, 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 %, and ΔSFD (=SFD25°C.−SFD−190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD−190° C. being SFD measured at a temperature of −190° C.
97 Citations
14 Claims
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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. - View Dependent Claims (3, 6)
-
-
2. A magnetic tape device comprising:
-
a magnetic tape; and a servo head, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes a servo pattern, 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.
-
-
4. 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 %, anda ratio Sdc/Sac of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
-
-
5. A magnetic tape device comprising:
-
a magnetic tape; and a servo head, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes a servo pattern, 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 %, anda ratio Sdc/Sac of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
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-
7. A magnetic reproducing method comprising:
-
reproducing information recorded on a magnetic tape by a reproducing head, wherein a magnetic tape transportation speed during the reproducing 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. - View Dependent Claims (8, 10)
-
-
9. A magnetic reproducing method comprising:
-
reproducing information recorded on a magnetic tape by a reproducing head, wherein a magnetic tape transportation speed during the reproducing 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 %, anda ratio Sdc/Sac of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
-
-
11. A head tracking servo method comprising:
-
reading a servo pattern of a magnetic layer of a magnetic tape by a servo head in a magnetic tape device, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes the servo pattern, 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. - View Dependent Claims (12, 14)
-
-
13. A head tracking servo method comprising:
-
reading a servo pattern of a magnetic layer of a magnetic tape by a servo head in a magnetic tape device, wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes the servo pattern, 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 %, anda ratio Sdc/Sac of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
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Specification