Nonconductive Magnetic Shield Laminate for Tape Head Protection
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Solution Overview
Problem
Magnetic tape drive systems face issues with shorting and erosion due to defects on the tape surface, which cause electrical shorts and inoperability, especially with new, unworn media, as conventional designs lack effective protection for the tape heads.
Innovation Solution
Incorporating a magnetic sensor structure with a magnetic shield featuring laminate pairs comprising a magnetic layer and an electrically nonconductive nonmagnetic layer, along with a nonmagnetic spacer layer, to create a protective barrier that reduces wear and prevents electrical shorting, while maintaining effective magnetic functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spacing between the head and tape is minimized to improve recording and read performance, then magnetic coupling and transition sharpness are improved, but the risk of electrical shorting and erosion from tape surface defects increases
Solution Approach 1:
An electrically nonconductive nonmagnetic layer is introduced as an intermediary between the magnetic head and the tape. This layer acts as a mediator that provides electrical insulation to prevent shorting while maintaining adequate magnetic coupling, thus resolving the contradiction between improved magnetic coupling and reduced shorting risk.
Solution Approach 2:
The magnetic head incorporates a composite structure with multiple layers including magnetic layers and electrically nonconductive nonmagnetic layers. This composite material approach allows the head to simultaneously achieve magnetic functionality and electrical insulation, preventing shorting while maintaining recording performance.
2Device complexity
If conventional magnetic head designs are used to maintain simplicity, then device complexity is low, but erosion and shorting occur due to lack of protective barriers
Solution Approach 1:
The magnetic head uses a composite laminate structure alternating between magnetic and electrically nonconductive nonmagnetic layers. This composite design provides inherent protective barriers against erosion and shorting while maintaining relatively simple fabrication processes and overall device complexity.
Solution Approach 2:
The electrically nonconductive nonmagnetic layers function as thin protective films within the magnetic head structure. These thin film barriers provide erosion protection and electrical insulation without significantly increasing the head's overall complexity or size.
3Reliability
If laminate pairs with substantial nonconductive layer thickness are used to maximize protection, then electrical insulation is improved, but magnetic shielding effectiveness and mechanical stability deteriorate
Solution Approach 1:
The invention optimizes the thickness parameters of both magnetic and electrically nonconductive nonmagnetic layers within specific ranges. By carefully controlling these dimensional parameters, the laminate structure achieves adequate electrical insulation while preserving magnetic shielding effectiveness and mechanical stability.
Solution Approach 2:
The alternating laminate structure of magnetic and electrically nonconductive nonmagnetic layers creates a composite material system where the combined properties of both materials provide electrical insulation, magnetic shielding, and mechanical stability simultaneously, balancing the competing requirements.
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 solution effectively prevents shorting and erosion, enhancing the durability and reliability of tape drive systems by using laminate pairs that provide improved magnetic shielding and mechanical stability, allowing for closer head-tape spacing without compromising performance.
Implementation Method 1
a magnetic shield having at least one laminate pair comprising a magnetic layer and an electrically nonconductive nonmagnetic layer
Implementation Method 2
an electrically nonconductive nonmagnetic layer
Data Source
AI summary
An apparatus according to one embodiment includes a magnetic sensor structure, a magnetic shield having at least one laminate pair comprising a magnetic layer and an electrically nonconductive nonmagnetic layer, and a nonmagnetic spacer layer between the sensor structure and the magnetic shield. In one embodiment, a deposition thickness of the nonconductive nonmagnetic layer in each laminate pair is about 10% or less of a total deposition thickness of the laminate pair. In another embodiment, a deposition thickness of the nonconductive nonmagnetic layer in each laminate pair is between about 1 and about 12 nanometers. In yet another embodiment, the magnetic shield has at least one second laminate pair, and a nonlaminated magnetic portion sandwiched between the at least one laminate pair and the at least one second laminate pair.