Magnetic Head Seed Layer Stabilizes Pole Magnetization
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Solution Overview
Problem
Conventional microwave assisted magnetic recording heads experience reduced effective magnetic permeability of the main magnetic pole due to spin wave generation, degrading recording characteristics.
Innovation Solution
Incorporating a non-magnetic separation seed layer with elements like tungsten, molybdenum, or iridium between the main magnetic pole and the spin-torque oscillator, which increases magnetic damping and suppresses spin wave generation, thereby stabilizing the magnetization and improving recording characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a spin torque oscillator is formed on the main magnetic pole to generate spin waves, then the recording capacity can be increased through microwave assisted magnetic recording, but the effective magnetic permeability of the main magnetic pole is reduced, degrading recording characteristics
Solution Approach 1:
A nonmagnetic separation seed layer is introduced as an intermediary between the main magnetic pole and the spin torque oscillator. This separation layer prevents direct magnetic interaction while allowing the spin torque oscillator to function, thereby maintaining the effective magnetic permeability of the main magnetic pole and preserving recording characteristics while still enabling spin wave generation for increased recording capacity
Solution Approach 2:
The structure is segmented by introducing a separate nonmagnetic layer that divides the main magnetic pole from the spin torque oscillator components. This segmentation isolates the magnetic pole's magnetic properties from the spin torque effects, allowing independent optimization of both functions - the main magnetic pole maintains high effective magnetic permeability while the spin torque oscillator generates spin waves for microwave assisted recording
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 solution effectively suppresses spin wave generation, enhances magnetic damping, and improves recording characteristics by stabilizing the magnetization of the main magnetic pole, leading to more efficient spin torque oscillation and increased recording capacity.
Implementation Method 1
the SIL causes a spin-torque effect on the main magnetic pole, thereby generating a spin wave in the main magnetic pole
Implementation Method 2
the magnetic damping of the main magnetic pole can be increased and the generation of spin wave to the spin torque in the main magnetic pole can be suppressed
Data Source
AI summary
According to one embodiment, a magnetic head includes a spin-torque oscillator which further includes a non-magnetic separation seed layer formed directly on a main magnetic pole and containing an element selected from W, Re, Os and Ir, an SIL, an IL and FGL formed one on another in this order.