Inclined Recessed Main Pole for MAMR Head Yield
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Solution Overview
Problem
The miniaturization of magnetic recording components in HDDs leads to reduced magnetic flux, making it difficult to maintain the precise alignment and size specifications of MAMR heads, which affects the recording magnetic field strength and yield.
Innovation Solution
A recessed main pole structure with angled surfaces and a microwave oscillator positioned between the main pole and an upper shield, allowing for reduced dependency on flare length for magnetic field intensity, enabling stable high-frequency magnetic field generation and improved alignment precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main pole is scaled down to reduce bit size, then the recording density is improved, but the emitted magnetic flux is reduced which precludes generation of sufficient recording magnetic field
Solution Approach 1:
The patent combines conventional magnetic recording with microwave oscillation in a single head structure. The microwave oscillator generates high-frequency magnetic fields that assist the main pole in writing data, allowing the main pole to be smaller while still achieving sufficient recording field strength through the synergistic effect of both mechanisms.
Solution Approach 2:
The patent introduces microwave frequency parameters (typically 2-20 GHz) to the recording system. By modulating the main pole field with high-frequency microwave oscillations, the effective magnetic field strength is enhanced, enabling smaller pole sizes while maintaining recording capability.
2Length of moving object
If the main pole size is reduced, then the bit size is reduced, but the area at the air bearing surface is reduced which reduces emitted magnetic flux
Solution Approach 1:
The patent merges microwave oscillation functionality with the main pole structure. The microwave oscillator is positioned adjacent to or integrated with the main pole, creating a combined structure where the microwave field compensates for the reduced magnetic flux from the smaller pole area.
Solution Approach 2:
The microwave oscillator acts as an intermediary that provides additional magnetic field energy to compensate for the reduced main pole area. The high-frequency oscillations mediate between the limited pole size and the required magnetic flux for successful recording.
3Measurement precision
If MAMR head components are miniaturized, then the recording density is improved, but the alignment precision between main pole and microwave oscillator becomes more difficult to maintain
Solution Approach 1:
The patent merges the main pole and microwave oscillator into a more integrated structure where their relative positions are fixed by common structural elements. This integration reduces the sensitivity to alignment errors that would occur with separate miniaturized components.
Solution Approach 2:
The patent segments the head into functional zones (main pole region, microwave oscillator region, shield regions) with defined interfaces. This segmentation allows for standardized manufacturing processes and tolerance accumulation management, improving overall alignment precision.
4Reliability
If the main pole and microwave oscillator sizes are simultaneously constrained, then the recording function is maintained, but the production yield is reduced due to difficulty in maintaining relative positional relationships
Solution Approach 1:
The patent combines multiple functions (main pole, microwave oscillator, shields) into an integrated assembly that is manufactured as a unified structure. This merging reduces the number of separate alignment operations required, thereby improving production yield while maintaining recording functionality.
Solution Approach 2:
The patent employs preliminary structuring where common layers and support structures are formed before final component definition. This preliminary action establishes reference frameworks that guide subsequent precise positioning, improving both yield and functionality.
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 design enhances the yield of MAMR heads by reducing the dependency on flare length, ensuring stable magnetic field intensity and improved recording performance, even with fluctuations in flare length specifications.
Implementation Method 1
a microwave oscillator or spin torque oscillator (STO) 23 is used for generating a high-frequency magnetic field
Implementation Method 2
microwave oscillator or spin torque oscillator (STO) 23 is used for generating a high-frequency magnetic field
Implementation Method 3
a main pole configured to emit a recording magnetic field for affecting a magnetic medium
Data Source
AI summary
In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole configured to serve as a first electrode and having a front portion at an air bearing surface (ABS) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the ABS, wherein an upper surface of the front portion of the main pole is angled with respect to a plane of deposition at a first angle of inclination of greater than 0°, and wherein at least a portion of an upper surface of the rear portion of the main pole is angled at a first angle of declination greater than 0° with respect to the plane of deposition, an upper shield positioned above the main pole, the upper shield configured to serve as a second electrode, and a microwave oscillator positioned between the main pole and the upper shield at the ABS.