Perpendicular Magnetic Recording Device Using Pulsed High Frequency Fields
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Solution Overview
Problem
Magnetic recording devices face challenges in increasing recording density due to record errors caused by continuous high frequency magnetic fields interfering between adjacent bits, leading to unstable magnetization reversal and errors.
Innovation Solution
A magnetic recording and reproducing device that employs a controller to generate pulse-modulated high frequency magnetic fields synchronized with recording intervals, alternating between high intensity signal and low intensity non-signal fields to minimize interference and stabilize magnetization reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous high frequency magnetic fields are applied to assist magnetization reversal, then recording density can be increased, but record errors occur due to interference between adjacent bits
Solution Approach 1:
The patent applies periodic pulsed magnetic fields instead of continuous high frequency magnetic fields. The controller generates pulses of high frequency magnetic fields synchronized with the recording intervals, creating periodic action that assists magnetization reversal only when needed. This temporal segmentation eliminates continuous interference between adjacent bits while maintaining the beneficial effect on recording density.
Solution Approach 2:
The continuous high frequency magnetic field is segmented into discrete pulses that are applied only during specific recording intervals. By dividing the continuous field into separate temporal segments synchronized with bit recording, the patent reduces interference between adjacent bits while maintaining effective magnetization reversal assistance during actual recording operations.
2Reliability
If high frequency magnetic field intensity is increased to improve magnetization reversal, then recording stability improves, but interference with adjacent bits increases causing record errors
Solution Approach 1:
The patent applies high intensity high frequency magnetic fields locally in time and space - specifically during recording intervals and at the magnetic head position. The controller synchronizes pulse generation with recording operations, ensuring that high intensity fields are applied only where and when needed for magnetization reversal, while minimizing spread to adjacent non-recording bits.
Solution Approach 2:
By using periodic pulsed fields instead of continuous fields, the patent concentrates high intensity magnetic field application into brief intervals synchronized with recording operations. This periodic action provides strong magnetization reversal assistance when needed while creating idle periods that allow interference to subside between adjacent bits.
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 effectively suppresses record errors and achieves stable recording operations even at high densities by controlling the high frequency magnetic field to prevent unintended magnetization reversal and ensure accurate bit transitions.
Implementation Method 1
generating a first signal magnetic field of a first intensity and a high frequency while generating a first recording magnetic field corresponding to the first information
Data Source
AI summary
According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.