TMR Servo Head Resistance Stability in Low-Speed Magnetic Tape
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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 low, 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 includes a non-magnetic support with a magnetic layer containing ferromagnetic powder and a binding agent, and has a C—H derived C concentration of 45 to 65 atom % calculated from X-ray photoelectron spectroscopic analysis, to prevent the decrease in resistance value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TMR head is used as servo head in magnetic tape device, then sensitivity and signal intensity are improved, but resistance value decreases significantly at low transportation speed, affecting head position control accuracy
Solution Approach 1:
The patent changes the chemical composition parameters of the magnetic layer by controlling the C-H derived C concentration to be 45 to 65 atom%, which fundamentally alters the interaction between the magnetic layer and TMR head, preventing the resistance value decrease that normally occurs at low transportation speeds
Solution Approach 2:
The patent uses a composite magnetic layer containing ferromagnetic powder and organic binder with specific C-H derived C concentration, creating a material composition that maintains stable TMR head resistance characteristics during low-speed tape transportation
2Quantity of substance
If recording density is increased to achieve high capacity, then recording capacity is improved, but magnetic signal strength becomes weaker, requiring higher sensitivity magnetic head
Solution Approach 1:
The patent changes the chemical composition parameters of the magnetic layer by controlling the C-H derived C concentration to be 45 to 65 atom%, which enhances the magnetic signal characteristics and enables effective reading of weak signals from high-density recording
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
Prevents the significant decrease in resistance value of the TMR head, maintaining signal intensity and accuracy of head position control during low-speed magnetic tape transportation, thereby ensuring reliable head tracking servo operations.
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 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
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 TMR head, 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, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and 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 45 to 65 atom %.