Microwave-Assisted Magnetic Recording Head for High-Density Servo Patterns
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Solution Overview
Problem
Conventional perpendicular magnetic recording techniques face challenges in achieving high-density recording with high servo signal quality due to side erasing effects, leading to reduced effective magnetization and signal quality, and complex positioning processes.
Innovation Solution
A servo pattern is recorded using a microwave assisted magnetic recording head with a ring-shape magnetic core and high-frequency oscillation element, allowing for seamless recording without significant side writing, resulting in enhanced magnetization and positional signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional perpendicular magnetic recording techniques are used, then recording density can be increased, but side erasing effects occur reducing effective magnetization and servo signal quality
Solution Approach 1:
The patent applies microwave-assisted magnetic recording technology that utilizes high-frequency oscillation (vibration) of the magnetic head to reduce the switching magnetic field required for recording. This vibrational mechanism enables precise magnetization reversal at high densities while minimizing side erasing effects that would otherwise degrade servo signal quality.
Solution Approach 2:
The patent changes the recording mechanism from conventional magnetic field alone to microwave-assisted magnetic field, fundamentally altering the parameter space of magnetic recording. This enables recording at higher densities (500 kTPI or more) while maintaining servo signal quality by controlling the interaction between microwave frequency fields and the magnetic medium.
2Reliability
If side erasing effects are reduced for high-density recording, then effective magnetization improves, but positioning process complexity increases
Solution Approach 1:
The patent employs self-servo technology where the servo patterns are automatically recorded and processed during the manufacturing process without requiring complex external positioning equipment. The system uses the recorded servo patterns themselves to guide subsequent recording operations, eliminating the need for separate complex positioning processes.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with microwave-assisted magnetic field control. Instead of relying on mechanical precision and complex positioning mechanisms, the system uses controlled microwave frequency magnetic fields to achieve precise magnetization patterns, simplifying the overall positioning process.
3Productivity
If seamless servo pattern recording is achieved, then format efficiency increases, but recording head requirements become more stringent
Solution Approach 1:
The patent designs a magnetic head system that performs multiple functions: it records servo patterns, maintains high-density data recording capability, and ensures seamless transitions without requiring separate specialized components. The microwave-assisted magnetic head integrates these functions, enabling seamless servo pattern recording that improves format efficiency while remaining manufacturable.
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 enables precise positioning and high-density recording with improved servo signal quality and format efficiency, achieving track densities of 500 kTPI or more with reduced side erasing effects and increased manufacturing yield.
Implementation Method 1
microwave assisted magnetic recording (MAMR), in which high-frequency magnetic field in a microwave band is applied to a magnetic recording medium so as to excite precession movement of medium magnetization
Implementation Method 2
high-frequency Spin Torque Oscillator (STO) has been proposed by Japanese Patent No. 4677589, configured to rapidly rotate spins by spin torque, thus generating high-frequency magnetic field
Implementation Method 3
a magnetic head that generates a magnetic field for reversing magnetization polarity
Implementation Method 4
magnetization-reversed so as to be suitable for the polarity of the magnetic recording field, thus effectively inducing the magnetization reversal
Data Source
AI summary
Disclosed is a technique of providing a perpendicular magnetic recording medium in which high-quality servo information enabling high-density recording of 500 kTPI or more is recorded, and a magnetic storage device of an adaptive track formatting type having large capacity, high reliability and high performance with high device manufacturing yield. At a servo area of the perpendicular magnetic recording medium, a servo sequence such as a burst pattern for positioning in a servo track is recorded in a seamless manner without big recording footprint (several times longer than the servo bit) and in a magnetization pattern such that a total amount of the recording magnetization is substantially zero.