GMR Transducer Separation Structure for Tape Wear
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Solution Overview
Problem
Giant magneto-resistive (GMR) sensors face limitations in tape drives due to corrosion and wear issues when in contact with tape, leading to reduced read-back signal-to-noise ratio and limited data capacity and rate, as they are prone to corrosion and abrasion from the tape environment.
Innovation Solution
A GMR transducer with a separation structure formed from non-magnetic or ferromagnetic materials, including an isolation film and patterned permanent magnet films, is used to physically separate the GMR sensor from the head-tape interface, reducing exposure to corrosive agents and abrasion while maintaining magnetic signal reading capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GMR sensor is placed at the head-tape interface to read data signals, then read-back signal quality is improved, but the sensor is exposed to corrosion and wear from tape contact
Solution Approach 1:
The invention divides the sensor assembly into two distinct parts: the GMR sensor element and the head-tape interface, separated by a non-magnetic separation structure. This segmentation allows the sensor to read magnetic signals through the separation structure without direct contact with the tape, thus maintaining measurement precision while improving reliability by eliminating corrosion and wear from tape contact.
Solution Approach 2:
A non-magnetic separation structure is introduced as an intermediary between the GMR sensor and the tape. This intermediary structure allows magnetic flux to pass through while preventing direct physical contact between the sensor and tape, thereby maintaining signal reading capability while protecting the sensor from corrosive and abrasive environmental factors.
2Quantity of substance
If track pitch is reduced to increase data capacity, then linear data density is improved, but physical read width is proportionally reduced resulting in decreased read signal
Solution Approach 1:
The invention changes the physical parameters of the read sensor system by using a GMR sensor with significantly higher resistance change amplitude (>10%) compared to AMR sensors (2.5%). This parameter change in sensor sensitivity compensates for the reduced physical read width that occurs when track pitch is reduced, allowing high linear data density to be maintained while preserving strong read signal strength.
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 separation structure effectively reduces corrosion and wear on GMR sensors, enabling increased data capacity and rate in tape drives by maintaining signal integrity and extending sensor lifespan, thus overcoming the limitations imposed by anisotropic magneto-resistive sensors.
Implementation Method 1
Giant magneto-resistive (GMR) sensors face limitations in tape drives due to corrosion and wear issues when in contact with tape
Implementation Method 2
The separation structure includes an under-layer film and an isolation film. The under-layer film conducts magnetic flux from tape at the head-tape interface to the GMR sensor
Data Source
AI summary
A giant magneto-resistive (GMR) transducer for reading data signals magnetically recorded on tape includes a GMR sensor and a separation structure formed on a front edge of the GMR sensor. The GMR sensor reads data signals magnetically recorded on a tape located at a head-tape interface. The separation structure physically separates the GMR sensor from the head-tape interface. The separation structure includes at least one film formed of at least one of non-magnetic and ferromagnetic materials such that the separation structure isolates the GMR sensor from physical contact with the tape at the head-tape interface while maintaining the ability of the GMR sensor to read data signals magnetically recorded on the tape even though the GMR sensor is physically separated from the tape at the head-tape interface. The separation structure may include an under-layer film and an isolation film. The GMR transducer is fabricated by a series of fabrication steps.