Microwave Assisted Magnetic Recording Head Sector Control
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Solution Overview
Problem
Current perpendicular magnetic recording technology faces challenges in achieving high recording density and reliability due to the distribution of magnetic properties in the circumferential direction of the recording medium, leading to issues like degraded servo quality, increased error rates, and limited manufacturing yield, especially at varying temperatures.
Innovation Solution
A magnetic recording method and device that adjust recording current and driving current for each sector of a perpendicular magnetic recording medium using a microwave assisted magnetic recording head with a high-frequency magnetic field oscillator, coupled with a thermal expansion element for clearance control, to optimize recording conditions based on sector-specific characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant recording current is used for the entire recording medium, then the device complexity is reduced, but the manufacturing precision and reliability deteriorate due to magnetic property distribution
Solution Approach 1:
The recording medium is divided into multiple sectors in the circumferential direction, and each sector is assigned different recording current values based on its magnetic properties. This segmentation allows optimized recording parameters for each sector while maintaining overall system simplicity.
Solution Approach 2:
Different recording current values are applied to different sectors based on their specific magnetic property characteristics. Each sector receives tailored recording parameters that match its local magnetic properties, improving recording quality uniformity across the entire medium.
2Reliability
If higher recording current is applied to areas with weak write ability, then the recording reliability improves, but the magnetic head and medium durability deteriorate due to excessive magnetic field intensity
Solution Approach 1:
The system identifies sectors with weak write ability and applies higher recording current values specifically to those sectors. This localized approach ensures reliable recording in difficult areas while avoiding excessive current application to the entire medium, thus protecting magnetic head and medium durability.
Solution Approach 2:
The recording current values are dynamically adjusted based on the detected magnetic properties of each sector. The system can adapt the current magnitude in real-time during recording operations to match the specific requirements of each sector, optimizing both reliability and durability.
3Manufacturing precision
If strict magnetic head selection is performed to solve recording problems at room temperature, then the manufacturing precision improves, but the adaptability to temperature variations deteriorates
Solution Approach 1:
The system dynamically adjusts recording current values based on detected magnetic properties that vary with temperature. This dynamic adaptation allows the system to maintain optimal recording quality across different temperature conditions without requiring strict magnetic head selection, improving both manufacturing precision and temperature adaptability.
Solution Approach 2:
The recording current parameters are changed based on temperature conditions and detected magnetic properties. By adjusting the current values dynamically according to temperature variations, the system maintains consistent recording quality across different temperature environments without compromising adaptability.
4Productivity
If microwave assisted magnetic recording is applied to increase recording density, then the productivity improves, but the device complexity increases due to additional high-frequency magnetic field oscillator
Solution Approach 1:
The high-frequency magnetic field oscillator is integrated into the magnetic head to enable microwave assisted magnetic recording. This multi-functional magnetic head can perform both conventional recording and microwave-assisted recording, increasing productivity while managing device complexity through functional integration.
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 enables effective microwave assisted magnetic recording suitable for each sector, improving servo information quality and error rates, resulting in a high-yield, high-capacity magnetic storage device with enhanced track density and reliability across different temperature environments.
Implementation Method 1
high-frequency magnetic field in a microwave band is applied to a perpendicular magnetic recording medium so as to excite precession of medium magnetization
Implementation Method 2
a thermal expansion element (clearance controller) that controls clearance between the recording head or the reproducing head and the perpendicular magnetic recording medium
Data Source
AI summary
Disclosed is a technique of providing a large-capacity magnetic storage device at high device manufacturing yield while keeping the reliability, the magnetic storage device enabling recording on a perpendicular magnetic recording medium having distribution of characteristics in the circumferential direction as well at high track density of 500 kTPI or more that would be expected from the average characteristics of the medium. A recording condition from is selected for each sector from a parameter table that stores a set of at least two types of recording conditions by a microwave assisted magnetic recording head including a magnetic recording pole and a high-frequency magnetic field oscillator in the magnetic storage device, and information is recorded for each sector based on the condition.