TMR Servo Head Resistance at Low Tape Speed
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Solution Overview
Problem
The use of TMR heads as servo heads in magnetic tape devices experiences 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 in head tracking servo systems.
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 coefficient of friction on the base portion of the surface is maintained at or below 0.30, preventing the significant decrease in resistance value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the magnetic tape transportation speed is reduced to or below 18 m/sec, then energy consumption is reduced, but the TMR head resistance value decreases significantly leading to decreased sensitivity and signal intensity
Solution Approach 1:
The invention changes the friction parameter of the magnetic tape surface by controlling the binding agent content and surface treatment, reducing the coefficient of friction to maintain TMR head resistance and sensitivity at low transportation speeds while reducing energy consumption
2Device complexity
If the TMR head is used as servo head at low transportation speeds, then device complexity is reduced, but signal intensity decreases due to resistance value drop
Solution Approach 1:
The invention modifies the magnetic tape surface parameters (friction coefficient through binding agent control) to prevent TMR head resistance degradation, ensuring reliable signal intensity when using TMR heads as servo heads at low speeds
3Stability of the object's composition
If the coefficient of friction of the magnetic layer surface is increased to prevent head sliding, then head position stability is improved, but TMR head resistance value decreases due to excessive friction
Solution Approach 1:
The invention optimizes the friction parameter to a specific range (coefficient of friction ≤ 0.30) that balances head position stability during recording with TMR head sensitivity maintenance, achieved through controlled binding agent content in the magnetic layer
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
This configuration allows the TMR head to maintain its sensitivity and signal intensity, ensuring accurate head position control and preventing signal degradation during head tracking servo operations at low transportation speeds.
Implementation Method 1
the servo head is a magnetic head (hereinafter, also referred to as a 'TMR head') including a tunnel magnetoresistance effect type element (hereinafter, also referred to as a 'TMR element') as a servo pattern reading element
Implementation Method 2
a magnetic signal (specifically, a leakage magnetic field) obtained from a magnetic layer
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 coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.