Magnetic Recording Head Negative Anisotropy Layer
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Solution Overview
Problem
High-frequency-assisted magnetic recording heads face challenges in maintaining effective magnetization rotation due to spin waves disrupting the oscillation in the high-frequency oscillator, leading to reduced assist effects and lower recording density.
Innovation Solution
Incorporating a magnetic material layer with negative magnetic anisotropy on the main magnetic pole or write shield, which faces the high-frequency oscillator, to suppress magnetization rotation and enhance the oscillating magnetic field, thereby improving the recording ability and achieving high recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-frequency oscillator is provided in the write gap to assist magnetic recording, then recording density can be improved, but spin waves occur that disturb magnetization rotation and reduce the assist effect
Solution Approach 1:
A nonmagnetic layer is introduced as an intermediary between the high-frequency oscillator and the write shield magnetic pole. This nonmagnetic layer acts as a mediator that prevents the generation of spin waves in the write shield magnetic pole while allowing the high-frequency oscillator to function properly. The nonmagnetic layer decouples the harmful magnetic interaction that causes spin waves, thereby maintaining stable magnetization rotation in the oscillator and preserving the recording assist effect.
2Power
If current is supplied through the main magnetic pole and write shield magnetic pole to the high-frequency oscillator, then the oscillator can generate high-frequency magnetic field, but spin waves are generated that reduce oscillation efficiency
Solution Approach 1:
The nonmagnetic layer serves as an intermediary that allows current to pass through to the high-frequency oscillator while preventing the formation of spin waves in the write shield magnetic pole. This intermediary structure enables the oscillator to generate the required high-frequency magnetic field without the energy loss associated with spin wave generation, thereby maintaining oscillation efficiency.
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 magnetic material layer with negative magnetic anisotropy effectively suppresses spin waves, allowing for stable high-frequency assist and improved recording density by maintaining efficient magnetization rotation and enhancing the magnetic field assist effect.
Implementation Method 1
a magnetic material layer which has negative magnetic anisotropy with respect to a direction intersecting with the stack surfaces of the high-frequency oscillator
Implementation Method 2
a phenomenon (spin wave) in which the magnetization near the surface of the write shield or main magnetic pole facing the surface of the oscillation layer fluctuates synchronously with magnetization rotation in the oscillation layer occurs
Data Source
AI summary
According to one embodiment, a magnetic recording head includes an air-bearing surface, a main magnetic pole, a write shield opposed to the main magnetic pole with a write gap therebetween, a high-frequency oscillator which includes a spin injection layer and a oscillation layer and is provided between the main magnetic pole and the write shield, the oscillation layer and the spin injection layer including a stack surface extending in a direction intersecting with the air-bearing surface, and a magnetic material layer which is provided in at least one of the main magnetic pole and the write shield, faces the high-frequency oscillator, and has negative magnetic anisotropy with respect to a direction intersecting with the stack surfaces of the high-frequency oscillator.