Laminated NiFe Front Shield for Data Writer Saturation
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Solution Overview
Problem
In data storage devices, such as rotating media hard disk drives, the increasing data capacity and decreasing spacing between data bits lead to physically smaller components like data writers becoming easily saturated with magnetic flux, causing unwanted erasure of data due to close proximity to the write pole, which existing technologies fail to adequately address.
Innovation Solution
A data writer front shield is constructed with a lamination of magnetic alloy materials, specifically using NiFe with 80% iron by weight, which provides a higher magnetic moment, lower coercivity, and reduced anisotropy field, allowing for optimized shielding and reduced risk of saturation, thereby enhancing data writing performance and preventing inadvertent data erasure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the data writer component is made physically smaller to increase data density, then data capacity increases, but the front shield becomes easily saturated with magnetic flux causing unwanted data erasure
Solution Approach 1:
The front shield is constructed using a composite material consisting of NiFe alloy with 80% iron by weight. This specific composition provides enhanced magnetic properties including higher magnetic moment and lower coercivity, allowing the shield to effectively manage magnetic flux in the compact data writer configuration without saturating and causing data erasure.
2Object-affected harmful factors
If the front shield is positioned closer to the write pole to improve shielding, then shielding effectiveness increases, but magnetic flux saturation occurs causing data erasure
Solution Approach 1:
The invention changes the material parameters of the front shield by using NiFe alloy with 80% iron content. This parameter change results in lower coercivity and reduced anisotropy field, enabling the shield to operate effectively at closer positions to the write pole without experiencing magnetic flux saturation that would cause data erasure.
3Ease of manufacture
If traditional magnetic shield materials are used, then manufacturing is simpler, but the shield saturates easily reducing data writing performance
Solution Approach 1:
The invention modifies the material composition parameters to use NiFe alloy with 80% iron by weight, which provides superior magnetic properties including higher magnetic moment and lower coercivity compared to traditional shield materials. This enables the shield to maintain effectiveness without saturation, preserving data writing performance in high-density storage applications.
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 use of an NiFe front shield with 80% iron by weight improves data writer performance by minimizing unwanted shunting and data erasure risks, enabling high data density storage while maintaining precise magnetic control and reduced material stress.
Implementation Method 1
The utilization of 80% iron in a NiFe layer contrasts to a NiFe layer composition with 55% iron by weight by providing a greater magnetic moment for the front shield
Implementation Method 2
providing a greater magnetic moment for the front shield along with lower Hc, less Hk
Implementation Method 3
providing a greater magnetic moment for the front shield along with lower Hc, less Hk
Implementation Method 4
providing a greater magnetic moment for the front shield along with lower Hc, less Hk, lower material stress after annealing operations
Data Source
AI summary
A data storage device data writer may arrange a write pole to be positioned uptrack from a front shield on an air bearing surface. The front shield can consist of a lamination of a first magnetic alloy material and a second magnetic alloy material. The second magnetic alloy material may be NiFe that has 80% iron by weight.