Magnetic Head Current Control for Higher Recording Density
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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 configuration that includes a magnetic element between first and second magnetic poles, where a controller supplies specific coil and element currents to generate AC magnetic fields effectively, optimizing the recording operation by controlling coil currents to enhance signal strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional magnetic head configuration is used, then device complexity is low, but recording density improvement is limited
Solution Approach 1:
The magnetic head is divided into multiple magnetic poles (first magnetic pole, second magnetic pole, third magnetic pole, fourth magnetic pole) with distinct functions. The magnetic element is segmented into first and second magnetic layers separated by non-magnetic layers, allowing independent control of each segment to generate AC magnetic fields for improved recording density.
Solution Approach 2:
The patent introduces a fifth dimension by adding a magnetic element with multiple layers between the magnetic poles, creating a three-dimensional structure that generates AC magnetic fields in addition to the traditional two-dimensional pole configuration. This dimensional expansion enables enhanced recording capability without proportionally increasing complexity.
2Manufacturing precision
If AC magnetic field generation is optimized, then recording density improves, but energy consumption increases
Solution Approach 1:
The magnetic element is driven with periodic AC current to generate oscillating AC magnetic fields. This periodic action allows the system to achieve enhanced recording density through resonant coupling with the magnetic recording medium, while the AC nature of the current enables efficient energy utilization compared to DC approaches.
Solution Approach 2:
The patent optimizes recording density by dynamically adjusting parameters including coil current magnitude, AC current frequency, and the ratio between AC and DC components. These parameter changes enable the system to achieve high recording density while minimizing energy consumption by operating at optimal points on the performance curve.
3Reliability
If signal strength is enhanced, then recording stability improves, but device complexity increases
Solution Approach 1:
The patent combines multiple current components (AC current and DC current) into a unified drive mechanism for the magnetic element. This merging allows the system to generate stable AC magnetic fields through a single integrated control approach rather than requiring separate control systems for each current component, thereby improving recording stability without proportionally increasing device complexity.
Solution Approach 2:
The controller monitors and adjusts the AC and DC current components based on feedback from the magnetic element's oscillation characteristics. This feedback mechanism enables the system to maintain optimal signal strength and recording stability by automatically tuning the current parameters, reducing the need for complex manual control systems.
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 AC magnetic fields, ensuring stable oscillation and effective data recording, thereby enhancing the magnetic recording process.
Implementation Method 1
When a first coil current of a first frequency is supplied to the coil... a first signal having a first signal strength of a first component at the first frequency is generated
Implementation Method 2
a magnetic element provided between the first magnetic pole and the second magnetic pole... a first current is supplied between the first terminal and the second terminal... a first signal having a first signal strength
Data Source
AI summary
According to one embodiment, a magnetic recording device includes a magnetic head and a controller. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element provided between the first magnetic pole and the second magnetic pole, a first terminal, a second terminal, and a coil. 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 less than the first coil current value.