Servo Master Perpendicular Magnetic Anisotropy Transfer
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Solution Overview
Problem
Current methods for recording servo information on magnetic recording media are time-consuming and expensive, especially as recording density increases, and require a large external magnetic field to efficiently magnetize the medium.
Innovation Solution
A servo master with a material having a high perpendicular magnetic anisotropy constant is used, which can generate a large magnetic field using a relatively small external magnetic field by applying perpendicular and lateral components of the field to efficiently transfer a servo pattern to the magnetic recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large external magnetic field is applied to generate a magnetic field capable of magnetizing a magnetic recording medium, then the magnetization efficiency is improved, but the device size and power consumption increase
Solution Approach 1:
The patent changes the magnetic anisotropy parameter of the servo master material from in-plane to perpendicular magnetic anisotropy. This parameter change allows the generation of a large magnetic field component perpendicular to the recording medium surface using a relatively small external magnetic field, thereby improving magnetization efficiency while reducing device size and power consumption requirements
Solution Approach 2:
The patent employs composite material structures including the servo master layer, underlayer, and cap layer with specific magnetic properties. The servo master is formed of materials with perpendicular magnetic anisotropy (such as CoCrPt, CoCrPtB, CoPt, CoFe, FePt), creating a composite system that efficiently generates the required magnetic field for magnetization with reduced external field requirements
2Quantity of substance
If the recording density of the magnetic recording medium is increased, then the storage capacity is improved, but the time required to record servo information increases
Solution Approach 1:
By changing the magnetic anisotropy parameter to perpendicular orientation and optimizing the magnetic field application parameters (applying field in both perpendicular and parallel directions), the patent achieves efficient servo pattern transfer even at high recording densities, reducing the time required for servo information recording while maintaining high storage capacity
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 approach reduces the intensity of the external magnetic field required by 10-30% and allows for more efficient magnetization of the servo area, decreasing the size and power consumption of the magnetic field generation device, thereby lowering costs and improving recording efficiency.
Implementation Method 1
applying perpendicular and lateral components of the field to efficiently transfer a servo pattern to the magnetic recording medium
Implementation Method 2
the servo master can be formed of a material having a magnetic anisotropy in a perpendicular direction to a surface of the magnetic recording medium
Implementation Method 3
A magnetic anisotropy constant of the servo master may be 1/20 of a perpendicular magnetic anisotropy constant of the magnetic recording medium or greater
Implementation Method 4
can generate a large magnetic field using a relatively small external magnetic field
Data Source
AI summary
A servo master having a pattern capable of being magnetically transferred as a servo pattern to a magnetic recording medium, wherein the servo master is formed of a material having a magnetic anisotropic constant perpendicular to a surface of the magnetic recording medium. The magnetic transfer method can include preparing a servo master patterned with a servo pattern to be formed on a magnetic recording medium, and arranging the servo master on the magnetic recording medium and applying an external magnetic field to the servo master in a first direction perpendicular to a recording surface of the magnetic recording medium, and in a second direction parallel to the recording surface of the magnetic recording medium.