Microwave Oscillator Current Direction Switching for Asymmetry Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Symmetrical spin torque oscillators used in microwave-assist magnetic recording may become asymmetrical due to manufacturing variations, leading to decreased oscillating efficiency.
Innovation Solution
A disk device with a recording head comprising a microwave oscillator and a switching circuit that adjusts the direction of current flow to optimize the oscillating efficiency of the spin torque oscillator, compensating for variations in processing by measuring error rates and switching between two current flow directions to achieve better performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a symmetrical spin torque oscillator is used for microwave-assist recording, then the design should provide balanced oscillation performance, but manufacturing variations cause asymmetry that decreases oscillating efficiency
Solution Approach 1:
The patent applies asymmetry by providing two current supply circuits that supply current in opposite directions to the spin torque oscillator. This allows the system to compensate for manufacturing-induced asymmetry by selecting the current direction that produces optimal oscillation, effectively using controlled asymmetry to overcome unwanted asymmetry from manufacturing variations
Solution Approach 2:
The patent changes the parameter of current flow direction to optimize oscillation efficiency. By switching between two current directions based on measured oscillation characteristics, the system adapts to manufacturing variations and maintains reliable performance despite asymmetry in the oscillator structure
2Ease of manufacture
If manufacturing variations occur in spin torque oscillators, then production cost and ease of manufacture are improved, but oscillating efficiency decreases
Solution Approach 1:
The system performs self-diagnosis by measuring oscillation characteristics and automatically selects the optimal current direction without external intervention. This self-service capability allows the system to compensate for manufacturing variations automatically, maintaining high oscillation efficiency despite variations in production
Solution Approach 2:
The patent makes the current supply dynamic by providing switching capability between two current directions. This dynamic adjustment allows the system to adapt to manufacturing variations in each individual oscillator, ensuring optimal performance without requiring precise manufacturing control
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
Improves the oscillating efficiency of the spin torque oscillator, enhancing the microwave assist effect and reducing errors in data recording, thereby optimizing the recording process.
Implementation Method 1
a spin torque oscillator is provided as a microwave oscillator and a microwave magnetic field is applied to the magnetic recording layer of a magnetic disk from the spin torque oscillator when recording
Implementation Method 2
a measurement circuit configured to measure a voltage across the spin torque oscillator when a current is supplied to the spin torque oscillator
Data Source
AI summary
According to one embodiment, a disk device includes a disk includes a recording layer, a recording head includes a main pole configured to apply a recording magnetic field onto the recording layer, and a microwave oscillator adjacent to the main pole, configured to apply a microwave magnetic field to the recording layer, a current supply circuit configured to supply a current to the microwave oscillator, and a switching circuit configured to switch a direction of current flow to the microwave oscillator.