Angled Write Pole Tip for HAMR Flux Density
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Solution Overview
Problem
Heat-assisted magnetic recording (HAMR) systems face design limitations due to complex manufacturing techniques for the write pole circuit, which restricts the ability to enhance magnetic field intensity and rise time, particularly in achieving high linear density capability and fast write operations.
Innovation Solution
A transducer head design featuring a write pole circuit with a paddle portion and an extended tip portion, where the extended tip angles away from the central axis of the paddle, and a coil wraps around it, providing unequal bevels to increase flux density and a return pole with a central axis perpendicular to the paddle, enhancing magnetic field control and rise time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If complex manufacturing techniques are used for the write pole circuit in HAMR systems, then the magnetic field intensity and rise time can be improved, but the design space for the magnetic portion of the writer is limited
Solution Approach 1:
The write pole circuit is divided into a paddle portion and an extended tip portion, allowing independent optimization of each segment. The extended tip portion can be specifically designed to enhance magnetic field intensity at the write location without affecting the overall structural complexity
Solution Approach 2:
The extended tip portion angles away from the central axis of the paddle portion, creating an asymmetric configuration that concentrates magnetic flux density where needed. This asymmetric design improves magnetic field intensity while maintaining manufacturing feasibility
2Manufacturing precision
If the extended tip portion has unequal double bevels to funnel flux density, then flux density at the end portion is increased, but the manufacturing complexity increases
Solution Approach 1:
Unequal double bevels are applied specifically to the extended tip portion to concentrate flux density at the critical write location. This localized geometric modification achieves precise flux control without requiring complex manufacturing processes for the entire write pole structure
3Reliability
If a light source and waveguide are used for thermal assistance, then write operations on high-stability magnetic compounds are enabled, but the manufacturing techniques become complex and design space is limited
Solution Approach 1:
The optical components (light source and waveguide) are separated from the magnetic write pole design, allowing the magnetic portion to be optimized independently. This extraction enables complex optical functions without constraining the magnetic circuit design space
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 design significantly boosts both transitional and steady-state performance, improving write field rise time, consistency, and magnitude, while being compatible with optical specifications of HAMR transducer heads, thus overcoming previous limitations in write field generation and saturation.
Implementation Method 1
a coil wraps around the extended tip portion
Implementation Method 2
HAMR systems apply heat to each bit storage area during a write operation
Implementation Method 3
laser thermal assistance by converting laser light by the near field transducer to evanescent fields that are more compact and create a highly intense energy spot on the media
Implementation Method 4
The extended tip portion may have unequal double bevels to funnel flux density into a smaller cross section to increase flux density at an end portion of the extended tip portion
Data Source
AI summary
In an example, a method comprises aligning a central axis of a paddle portion on a write pole circuit to be substantially perpendicular to an adjacent magnetic surface, and bending a central axis of an extended tip portion relative to the central axis of the paddle portion. In another example, a transducer head comprises a write pole circuit having a paddle portion with a central axis, and an extended tip portion with a central axis, the central axis of the extended tip portion angled from the central axis of the paddle portion. In another example, a magnetic circuit comprises a write pole circuit having a paddle portion and an extended tip portion, the extended tip portion bending away from a central axis of the paddle portion, and a coil wrapping around the extended tip portion.