Platinum Group Alloy Near-Field Transducers for HAMR Durability

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Solution Overview

Problem

Heat-assisted magnetic recording (HAMR) devices face challenges with the durability of near-field transducers (NFTs) due to high temperatures and mechanical stress, leading to material diffusion and wear, which affects energy transfer efficiency and focal point precision.

Innovation Solution

The use of alloys comprising platinum group metals like iridium (Ir), rhodium (Rh), and osmium (Os) combined with elements such as hafnium (Hf), niobium (Nb), tantalum (Ta), titanium (Ti), and zirconium (Zr) in near-field transducers, which form two-phase coherent structures with enhanced mechanical strength, hardness, and thermal conductivity, improving durability and energy transfer efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional materials are used in near-field transducers, then manufacturing cost is lower, but durability and mechanical strength deteriorate under high temperature and mechanical stress

Engineering Contradiction:

ImprovedurabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs composite material structures combining platinum group metals (Ir, Rh, Os) with refractory metals (Hf, Nb, Ta, Ti, Zr) to create near-field transducers with superior mechanical strength and thermal stability. This composite approach resolves the contradiction by achieving enhanced durability under HAMR operating conditions while maintaining manufacturability through established thin-film deposition techniques.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the material parameters by selecting specific platinum group metals combined with refractory metals, which possess high melting points, thermal conductivity, and mechanical strength. This parameter change enables the transducer to withstand high temperatures and mechanical stress during HAMR operation, directly improving reliability without compromising ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If high thermal conductivity materials are used, then energy transfer efficiency is improved, but material diffusion increases under high temperature

Engineering Contradiction:

Improveenergy transfer efficiencyVSAvoidmaterial diffusion

Core Design Contradiction:

Use of energy by moving objectVSLoss of substance

Solution Approach 1:

The composite structure of platinum group metals with refractory metals creates a material system where thermal conductivity is optimized for energy transfer while the refractory metal component provides thermal stability that suppresses material diffusion. This composite material resolves the contradiction by balancing thermal performance with dimensional stability under high temperature conditions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention applies local quality by creating a near-field transducer material composition specifically optimized for the high-temperature focal region. The platinum group metal provides excellent thermal conductivity where needed for energy transfer, while the refractory metal addition locally enhances thermal stability to prevent diffusion, achieving both goals simultaneously.

Inventive Principle:

Principle #3Local quality

3Reliability

If material hardness is increased to reduce wear, then durability is improved, but mechanical brittleness increases

Engineering Contradiction:

Improvewear resistanceVSAvoidmechanical toughness

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The composite material system combines platinum group metals with refractory metals to achieve an optimal balance between hardness and toughness. The refractory metal component increases hardness and wear resistance, while the platinum group metal maintains ductility and mechanical toughness, resolving the contradiction between wear resistance and mechanical strength.

Inventive Principle:

Principle #40Composite materials

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

These alloys provide improved mechanical strength, thermal conductivity, and durability for near-field transducers, enabling more efficient energy transfer and reduced wear, thus enhancing the performance of HAMR devices by maintaining high temperatures and precision in focal points.

Implementation Method 1

a near field transducer to focus the light to a spot size smaller than the diffraction limit

Methodology Applied

Scientific EffectLight focusing: Focusing

Implementation Method 2

The NFT absorbs energy from a laser and focuses it to a very small area; this can cause the temperature of the NFT to increase

Methodology Applied

Scientific EffectOptical absorption and thermal conversion: Absorption (EM radiation)

Implementation Method 3

alloys of a first element selected from: platinum (Pt), palladium (Pd), rhodium (Rh), iridium (Ir), ruthenium (Ru), and osmium (Os); and a second element selected from; hafnium (Hf), niobium (Nb), tantalum (Ta), titanium (Ti), vanadium (V), and zirconium (Zr)

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11107496B2Near field transducers including platinum group alloys

Publication Date: 2021.08.31 SEAGATE TECH LLC

AI summary

Heat assisted magnetic recording (HAMR) devices that includes a near field transducer, the near field transducer including alloys of a first element selected from: platinum (Pt), palladium (Pd), rhodium (Rh), iridium (Ir), ruthenium (Ru), and osmium (Os); and a second element selected from; hafnium (Hf), niobium (Nb), tantalum (Ta), titanium (Ti), vanadium (V), and zirconium (Zr).