Auxiliary Structure Between Magnetic Pole and NFT
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Solution Overview
Problem
In heat-assisted magnetic recording (HAMR) devices, achieving a high thermal gradient for improved areal data density is hindered by the limitations of optical focusers, which cannot create hotspots smaller than half the wavelength of light, and high temperatures can cause degradation of the magnetic recording pole material, reducing the lifespan of the near-field transducer.
Innovation Solution
Incorporating a metallic auxiliary structure between the near-field transducer (NFT) and the magnetic pole, which extends from the enlarged region towards the media-facing surface, helps concentrate surface plasmons and increase the thermal gradient without significantly raising the NFT temperature, thereby enhancing the coupling efficiency with the recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature is applied to create a thermal gradient for improved areal data density, then the thermal gradient increases, but the magnetic recording pole material degrades and near-field transducer lifespan reduces
Solution Approach 1:
A metallic auxiliary structure is introduced as an intermediary component positioned between the near-field transducer and the magnetic recording pole. This structure acts as a mediator that concentrates surface plasmons and directs thermal energy toward the recording media while physically separating the heat source from the magnetic pole, thereby preventing material degradation while maintaining effective heating for high-density recording
Solution Approach 2:
The metallic auxiliary structure is designed with specific local properties (metallic material with plasmonic characteristics) positioned at a critical location between the NFT and magnetic pole. This local structural modification creates a concentrated thermal gradient in the recording media region while isolating the magnetic pole from direct thermal exposure, resolving the contradiction between achieving high thermal gradient and maintaining pole material stability
2Device complexity
If optical focusers are used to create hotspots, then the device complexity is low, but the hotspot size cannot be smaller than half the wavelength of light limiting areal data density
Solution Approach 1:
The patent replaces the conventional optical focuser system with a near-field transducer based on surface plasmon resonance. This substitution eliminates the diffraction limit constraint by using evanescent waves and plasmonic effects to achieve sub-wavelength hotspot sizes, thereby improving areal data density while maintaining relatively simple device integration through direct writing onto the recording media
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 increases the thermal gradient by 50% or more, improving the sharpness of magnetic transitions and extending the lifespan of the near-field transducer by preventing material diffusion from the magnetic pole.
Implementation Method 1
The structure is configured to extend generation of surface plasmons toward the magnetic pole
Implementation Method 2
increases the thermal gradient by 50% or more
Data Source
AI summary
An apparatus includes a waveguide, a magnetic pole, and a near-field transducer. The near field transducer is positioned at or near a media-facing surface. The near-field transducer is operatively coupled to the waveguide. The near-field transducer includes an enlarged region. The near-field transducer also includes a peg region extending from the enlarged region towards the media-facing surface. The peg region is separated from the magnetic pole. The near-field transducer also includes a structure positioned between the magnetic pole and the peg region. The structure is separated from the peg region by a gap. The structure extends from the enlarged region towards the media-facing surface. The structure is configured to extend generation of surface plasmons toward the magnetic pole.