Magnetic Head Current Control for Higher-Density AC Recording
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Solution Overview
Problem
Existing magnetic recording devices face challenges in improving recording density due to inefficiencies in generating and utilizing AC magnetic fields for data recording.
Innovation Solution
A magnetic recording device with a magnetic head and controller that includes a magnetic element with specific layer configurations and current supply mechanisms to generate and utilize AC magnetic fields effectively, optimizing the recording coil and element currents to enhance recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional magnetic recording methods are used, then device complexity is maintained at acceptable levels, but recording density cannot be improved
Solution Approach 1:
The magnetic element is segmented into multiple magnetic layers (first magnetic layer, second magnetic layer, third magnetic layer) with different magnetization directions. This segmentation allows independent control of each layer's contribution to the AC magnetic field, enabling enhanced recording density while managing complexity through modular design
Solution Approach 2:
The patent introduces a vertical stacking dimension by arranging multiple magnetic layers perpendicular to the recording medium surface. This dimensional transition from planar to vertical configuration increases the effective magnetic field generation capability without proportionally increasing device footprint complexity
2Productivity
If AC magnetic fields are generated using conventional methods, then device structure remains simple, but the efficiency of data recording is insufficient
Solution Approach 1:
The magnetic element structure incorporates dynamic control capabilities through multiple magnetic layers that can be independently activated. By dynamically switching which layers contribute to the AC magnetic field based on recording requirements, the system achieves higher recording efficiency while managing structural complexity
Solution Approach 2:
The patent utilizes parameter changes in the magnetic layers' magnetization directions and coercive forces to optimize AC magnetic field generation. By carefully selecting and adjusting these magnetic parameters for each layer, recording efficiency is enhanced without requiring proportionally complex device structures
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 device achieves improved recording density by efficiently generating and utilizing AC magnetic fields, ensuring stable oscillation and effective data recording operations.
Implementation Method 1
When a first coil current of a first frequency is supplied to the coil and a first current is supplied between the first terminal and the second terminal, a first signal having a first signal strength of a first component at the first frequency is generated between the first terminal and the second terminal
Implementation Method 2
when a first coil current of a first frequency is supplied to the coil and a first current is supplied between the first terminal and the second terminal, a first signal having a first signal strength of a first component at the first frequency is generated
Data Source
AI summary
According to one embodiment, a magnetic recording device includes a magnetic head, and a controller. The magnetic head including a first magnetic pole, a second magnetic pole, a magnetic element provided between the first magnetic pole and the second magnetic pole, a coil, a first terminal, and a second terminal. In the first operation, the controller is configured to supply a recording coil current to the coil while supplying a recording element current to the magnetic element. An absolute value of the recording coil current is equal to or greater than the coil current value. The recording element current is equal to or less than the first current value.