Noble Metal Alloy Diffusion Barrier for HAMR Head Thermal Stability
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Solution Overview
Problem
Current heat-assisted magnetic recording (HAMR) heads face challenges due to thermal issues, where heating of the magnetic head can cause diffusion of insulating materials into the magnetic pole, leading to device failure and performance degradation.
Innovation Solution
A noble metal alloy diffusion barrier layer with a melting point greater than 1065 degrees Celsius is introduced between the insulating layer and the magnetic lip to prevent diffusion, selected from metals like Au, Pt, Ir, and Ru, with an alloying element comprising less than 10 percent, to isolate the near-field transducer from the magnetic pole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating is applied to the magnetic media to lower coercivity for writing, then writing capability is improved, but thermal migration and diffusion of insulating material into the magnetic pole occurs causing device failure
Solution Approach 1:
A diffusion barrier layer comprising a noble metal alloy is introduced between the insulating layer and the magnetic lip to prevent diffusion of insulating material into the magnetic pole during thermal operations
Solution Approach 2:
The diffusion barrier layer uses a composite noble metal alloy consisting of a base noble metal (Au, Pt, Ir, Re, or Ru) with a small amount of alloying element (less than 10 percent) that is immiscible in the noble metal, creating a material with enhanced diffusion barrier properties and elevated melting point
2Temperature
If the melting point of the diffusion barrier layer is increased to prevent thermal migration, then structural integrity at high temperature is improved, but manufacturing complexity increases
Solution Approach 1:
The melting point and diffusion barrier properties are enhanced by changing the compositional parameters of the noble metal alloy, specifically by adding a small controlled amount (less than 10 percent) of alloying element that is immiscible in the noble metal
Solution Approach 2:
The alloying element is distributed locally within the noble metal matrix to create regions with enhanced thermal stability and diffusion resistance, while maintaining the overall noble metal characteristics
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 diffusion barrier layer effectively prevents oxygen diffusion from the insulating layer into the magnetic lip, enhancing the reliability and performance of the HAMR head by maintaining structural integrity and preventing thermal migration.
Implementation Method 1
A noble metal alloy diffusion barrier layer is present between the insulating layer and the magnetic lip to prevent diffusion from the insulating layer into the magnetic lip
Implementation Method 2
The solution heats up a localized area on the media to a temperature above the Curie temperature, thereby, lowering the effective coercivity of the localized region
Implementation Method 3
heats up a localized area on the media to a temperature above the Curie temperature, thereby, lowering the effective coercivity
Data Source
AI summary
The present invention generally relates to a HAMR head. An insulating layer isolates the NFT from the magnetic lip of the magnetic pole. A noble metal alloy diffusion barrier layer is present between the insulating layer and the magnetic lip to prevent diffusion from the insulating layer into the magnetic lip. The noble metal alloy has a melting point of greater than about 1065 degrees Celsius, and the noble metals may be selected from Au, Pt, Ir, Re and Ru. The alloying elements comprise less than 10 percent of the alloy. The alloying elements can include Rh, W, Mo, Ni, Pt, Co, B, Ru and combinations thereof. The diffusion barrier layer may surround the magnetic lip, may surround the insulating layer, or may simply be at the interface of the insulating layer and the magnetic lip.