TMR Head Servo Stability via Ferrite Tilt
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Solution Overview
Problem
The challenge in magnetic tape devices is the significant decrease in resistance value of TMR heads when used as servo heads, particularly at low transportation speeds, leading to decreased sensitivity and signal intensity, which affects the accuracy of head tracking servo in magnetic tape devices.
Innovation Solution
A magnetic tape device with a TMR head using a magnetic tape that includes a non-magnetic support, a magnetic layer with ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent, where the ferromagnetic hexagonal ferrite powder is tilted at an angle of 0.85 to 0.95, preventing a significant decrease in resistance value and ensuring stable signal reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a TMR head is used as a servo head in a magnetic tape device, then high sensitivity and signal intensity are achieved, but the resistance value decreases significantly at low transportation speeds, reducing measurement precision
Solution Approach 1:
The patent changes the physical parameters of the magnetic tape by controlling the tilt angle of ferromagnetic hexagonal ferrite powder particles in the magnetic layer. By optimizing this particle orientation parameter (cosθ between 0.85-0.95), the magnetic signal characteristics are improved, which stabilizes the resistance value of the TMR head during low-speed transportation and prevents significant resistance decreases that would compromise measurement precision.
Solution Approach 2:
The patent employs a composite magnetic layer containing both ferromagnetic hexagonal ferrite powder and non-magnetic powder. This composite material structure creates optimized magnetic signal properties that enhance the stability of the TMR head resistance value during operation, particularly at low transportation speeds, thereby maintaining reliable measurement precision for head tracking servo.
2Use of energy by moving object
If the magnetic tape transportation speed is reduced, then energy consumption is lowered, but the TMR head resistance value decreases significantly, affecting sensitivity
Solution Approach 1:
The patent modifies the magnetic layer parameters by controlling the tilt angle of ferromagnetic hexagonal ferrite powder particles. This parameter change optimizes the magnetic signal strength and characteristics, enabling the TMR head to maintain high sensitivity and stable resistance values even during low-speed transportation, thus allowing reduced energy consumption without compromising measurement precision.
3Quantity of substance
If recording density is increased, then capacity is improved, but the magnetic signal becomes weaker, requiring higher sensitivity heads
Solution Approach 1:
The patent uses a composite magnetic layer with ferromagnetic hexagonal ferrite powder and non-magnetic powder to create optimized magnetic signal properties. This composite structure enhances signal strength while maintaining high recording density, addressing the trade-off between capacity and signal strength that necessitates the use of high-sensitivity TMR heads.
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 a significant decrease in resistance value of the TMR head, maintaining high sensitivity and signal intensity even at low transportation speeds, thereby enhancing the accuracy of head tracking servo 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 magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent
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 hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.