TMR Servo Head Resistance Stabilization via Magnetic Tape Surface Contact Angle
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Solution Overview
Problem
In magnetic tape devices, the use of TMR heads as servo heads results in a significant decrease in resistance value when the magnetic tape transportation speed is equal to or lower than 18 m/sec, leading to decreased sensitivity and signal intensity, which affects the accuracy of head position control during head tracking servo operations.
Innovation Solution
A magnetic tape device with a TMR head as the servo head, where the magnetic tape has a non-magnetic support with a magnetic layer containing ferromagnetic powder and a binding agent, and a 1-bromonaphthalene contact angle of 48.0° to 53.0°, preventing the significant decrease in resistance value and ensuring stable contact with the TMR head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TMR head is used as servo head in magnetic tape device with transportation speed equal to or lower than 18 m/sec, then sensitivity and signal intensity improve, but resistance value decreases significantly
Solution Approach 1:
The patent changes the physical parameters of the magnetic tape surface by controlling the contact angle with 1-bromonaphthalene to be 45° or more. This parameter change prevents the significant decrease in TMR head resistance value while maintaining high sensitivity and signal intensity during head tracking servo operations at transportation speeds of 18 m/sec or lower.
2Measurement precision
If TMR head is used as servo head, then head position control accuracy improves, but resistance value decreases leading to unstable operation
Solution Approach 1:
The patent modifies the surface properties of the magnetic tape by controlling the contact angle parameter to be 45° or more. This parameter change stabilizes the resistance value of the TMR head during head tracking servo operations, ensuring stable operation while maintaining high head position control accuracy.
3Stability of the object's composition
If magnetic tape transportation speed is reduced to equal to or lower than 18 m/sec, then contact stability improves, but TMR head resistance value decreases significantly
Solution Approach 1:
The patent changes the surface characteristic parameter of the magnetic tape (contact angle with 1-bromonaphthalene) to be 45° or more. This parameter change prevents the significant decrease in TMR head resistance value that normally occurs at low transportation speeds, while maintaining stable contact between the magnetic tape and TMR head.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents the decrease in resistance value of the TMR head, maintaining high sensitivity and signal intensity, thereby enhancing the accuracy of head position control and recording/reproducing characteristics in magnetic tape devices.
Implementation Method 1
the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element
Implementation Method 2
a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 48.0° to 53.0°
Data Source
AI summary
The magnetic tape device includes: a magnetic tape; and a servo head, in which 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, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 48.0° to 53.0°.