Parabolic NFT Waveguide Blocker for HAMR Thermal Background

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Solution Overview

Problem

In heat-assisted magnetic recording (HAMR) heads, uncoupled optical energy radiates as background, degrading the thermal spot confinement and reducing the thermal gradient, which affects the data capacity and reliability of hard disk drives (HDDs).

Innovation Solution

A parabolic waveguide blocker is introduced in the near-field transducer (NFT) to reduce electromagnetic radiation and recycle scattering fields, improving the thermal gradient and increasing the area density capacity (ADC) of HAMR heads by using a parabolic shape with a 45-degree slope angle and materials like Ruthenium or Rhodium.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If uncoupled optical energy is allowed to radiate from the waveguide core, then the NFT can be excited and heat the recording medium, but the uncoupled light degrades the confinement of the thermal spot and reduces the thermal gradient

Engineering Contradiction:

Improvethermal gradientVSAvoidthermal background

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful uncoupled optical energy that would otherwise create thermal background into a beneficial effect by using a parabolic waveguide blocker to redirect and concentrate this energy back onto the NFT, enhancing the thermal gradient while eliminating the background heating effect

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The parabolic waveguide blocker acts as an intermediary element between the waveguide core and the recording medium, intercepting uncoupled optical energy and redirecting it to the NFT, thereby mediating the energy distribution to improve thermal confinement

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If a traditional waveguide blocker is used, then electromagnetic radiation can be reduced, but the scattering field from the NFT is not recycled

Engineering Contradiction:

Improveelectromagnetic radiationVSAvoidscattering field

Core Design Contradiction:

Object-generated harmful factorsVSLoss of energy

Solution Approach 1:

The patent converts the previously wasted scattering field energy into a beneficial resource by using the parabolic shape to redirect scattered light back onto the NFT, thereby reducing energy loss and enhancing the heating effect

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

Instead of allowing the scattering field to be discarded as waste energy, the parabolic waveguide blocker recovers this energy by redirecting it back onto the NFT, thereby improving overall system efficiency and thermal gradient

Inventive Principle:

Principle #34Discarding and recovering

3Temperature

If the waveguide blocker uses a parabolic shape with 45-degree slope angle, then the thermal gradient is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvethermal gradientVSAvoidwaveguide blocker fabrication

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent employs a parabolic curved surface instead of flat or simple geometric shapes, utilizing curvature to achieve superior light redirection and thermal gradient improvement, though this increases manufacturing complexity compared to simpler geometries

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 parabolic waveguide blocker effectively suppresses background electromagnetic radiation, enhancing the thermal gradient and ADC of HAMR heads, thereby improving data storage density and reliability.

Implementation Method 1

The waveguide blocker can be configured to reduce electromagnetic radiation from the waveguide core

Methodology Applied

Scientific EffectElectromagnetic radiation absorption: Absorption (EM radiation)

Implementation Method 2

near field surface plasmon resonance on the NFT can be excited by a waveguide and heats the recording medium

Methodology Applied

Scientific EffectSurface plasmon resonance:

Implementation Method 3

improve a thermal gradient to increase an area density capacity (ADC) of the hard disk drive write head

Methodology Applied

Scientific EffectThermal gradient enhancement: Temperature Gradient

Data Source

PatentUS20250372121A1Parabolic Shaped Plasmonic Waveguide Blocker For Heat Assisted Recording Head

Publication Date: 2025.12.04 HEADWAY TECHNOLOGIES INC

AI summary

The present embodiments relate to a near-field transducer (NFT) for a hard disk drive write head with a parabolic waveguide blocker. The waveguide blocker can include a parabolic curved surface in a center portion of a first side of the waveguide blocker and a first side comprising a slope angle of between 10-90 degrees. The waveguide blocker can be configured to reduce electromagnetic radiation from the waveguide core and recycle a scattering field emitting from the NFT to mitigate a thermal background in a recording medium and improve a thermal gradient to increase an area density capacity (ADC) of the hard disk drive write head.