MAMR Head Multi-Layer Recording for Density and Format Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic recording systems face challenges in maximizing aerial density capability due to the inverse competition between track density and format efficiency on a single recording surface, leading to substantial memory requirements for storing data sector split information and increased production costs.
Innovation Solution
Implementing a magnetic recording medium with multiple recording layers, each having distinct ferromagnetic resonant frequencies for user data and servo data, utilizing microwave-assisted magnetic recording (MAMR) to increase coercivity and reduce grain size, thereby enhancing recording density and format efficiency by separating servo wedges from user data layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If track density is increased on a single recording surface, then aerial density capability is improved, but format efficiency deteriorates due to data sector split information storage requirements
Solution Approach 1:
The invention divides the recording surface into multiple recording layers, each capable of storing data sectors independently. By segmenting the storage across layers, the system can store data sector split information in one layer while user data resides in another layer, eliminating the format efficiency penalty that would otherwise result from tracking sector splits on the same surface.
Solution Approach 2:
The invention transitions from a two-dimensional single-surface recording approach to a three-dimensional multi-layer recording structure. This dimensional change allows simultaneous optimization of track density (by adding layers vertically) while maintaining format efficiency (by storing sector split metadata in a separate layer), thereby resolving the inverse competition between these parameters.
2Manufacturing precision
If microwave-assisted magnetic recording is used to increase coercivity, then recording density is improved, but production costs increase
Solution Approach 1:
The invention utilizes microwave-assisted magnetic recording by introducing a write-assist arrangement that generates radiofrequency magnetic fields at the ferromagnetic resonant frequency of the recording layer. This parameter change in the magnetic field characteristics enables higher coercivity recording media to be written, thereby achieving higher recording density while the multi-layer structure helps manage the complexity of implementing MAMR.
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 significantly increases aerial density capability by allowing higher track densities and format efficiency, reducing memory requirements and production costs, while maintaining accurate data location and storage capacity.
Implementation Method 1
a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency
Implementation Method 2
A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer
Implementation Method 3
a write pole configured to generate a write magnetic field
Implementation Method 4
A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers
Data Source
AI summary
A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.