STO Asymmetric Geometry for Perpendicular Current Flow
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Solution Overview
Problem
In microwave assisted magnetic recording (MAMR) heads, the current flowing to the spin torque oscillator (STO) is not perpendicular, leading to reduced spin torque due to its parallel orientation with the media facing surface, which affects the recording quality.
Innovation Solution
The STO is designed with specific surface angles such that the electrical current flowing through it is substantially perpendicular, maximizing spin torque by forming acute angles between its surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the STO is formed near the trailing side of a main pole with a tapered write pole configuration, then the recording magnetic field is increased, but the current flowing to the STO becomes parallel to the media facing surface instead of perpendicular, causing spin torque to decrease
Solution Approach 1:
The STO is designed with an asymmetric angular configuration where the first surface forms a first acute angle and the second surface forms a second acute angle with the third surface, and the second acute angle is less than or equal to the first acute angle. This asymmetric geometry ensures that the current flowing through the STO is substantially perpendicular to the STO, maximizing spin torque while maintaining the tapered write pole configuration for high recording magnetic field.
2Reliability
If the current flowing to the STO is made perpendicular to maximize spin torque, then recording quality is improved, but the STO structure becomes more complex requiring specific angular configurations
Solution Approach 1:
The invention optimizes the angular parameters of the STO by defining specific acute angles between the surfaces. The first acute angle and second acute angle are carefully selected such that the current flow is substantially perpendicular to the STO, maximizing spin torque efficiency. This parameter optimization achieves high recording quality while keeping the structural design within manageable complexity through well-defined geometric relationships.
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 configuration enhances spin torque efficiency, improving the recording quality by ensuring the current is optimally aligned with the STO, thereby increasing the effectiveness of the magnetic field applied to the recording medium.
Implementation Method 1
MAMR enabled magnetic recording heads utilize a spin torque oscillator (STO) for generating a microwave (high frequency AC magnetic field). When the magnetic field from the write head is applied and current is conducted to the STO, the STO oscillates and may provide an AC magnetic field to the medium.
Implementation Method 2
microwave assisted magnetic recording (MAMR) has been studied as a recording method to improve the areal density of a magnetic read/write device
Implementation Method 3
the current flowing to the STO is not perpendicular to the STO, which causes the spin torque to decrease. Having this configuration, the electrical current going through the STO is substantially perpendicular to the STO, which causes the spin torque to be maximized.
Data Source
AI summary
Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO. The STO has a first surface at a media facing surface, a second surface that is opposite the first surface and a third surface adjacent to the first and second surfaces. The first and third surfaces form a first acute angle and the second and third surfaces form a second acute angle, where the second acute angle is less than or equal to the first acute angle. Having this configuration, the electrical current going through the STO is substantially perpendicular to the STO, which causes the spin torque to be maximized.