Magnetic Tape Back Coating Protrusion Control for Dropout Reduction
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Solution Overview
Problem
Magnetic tapes using hexagonal strontium ferrite and ε-iron oxide powders experience significant dropout issues due to protrusions on the back coating layer, leading to increased error rates, which existing technologies have not effectively addressed.
Innovation Solution
A magnetic tape design with a back coating layer having a controlled number of protrusions between 50 nm and 75 nm in height, limited to 700 pieces per 6400 μm², to minimize the formation of recesses on the magnetic layer surface, thereby reducing dropout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hexagonal strontium ferrite powder or ε-iron oxide powder is used in the magnetic layer, then high density recording suitability is improved, but dropout occurs remarkably leading to increased error rate
Solution Approach 1:
The back coating layer is prepared in advance with controlled protrusion characteristics (height and density) before the magnetic layer is formed. This preliminary control of the back coating layer's surface topology prevents excessive recess formation in the magnetic layer, thereby preventing dropout during signal reading while allowing the use of high-density ferromagnetic powders
Solution Approach 2:
The invention changes the physical parameters of the back coating layer, specifically controlling the height distribution of protrusions (limiting the number of protrusions with height ≥50 nm to 700 pieces/6400 μm² or less). This parameter control of the back coating layer's surface profile prevents the formation of harmful recesses that cause dropout, enabling reliable signal reading with high-density magnetic powders
2Shape
If the back coating layer has many protrusions, then the back coating layer structure is formed, but recesses are formed on the magnetic layer surface causing dropout
Solution Approach 1:
The invention precisely controls the protrusion parameters in the back coating layer, specifically limiting the number of protrusions with height ≥50 nm to 700 pieces/6400 μm² or less. This parameter control maintains the necessary back coating layer structure while preventing excessive recess formation in the magnetic layer that would cause dropout
Solution Approach 2:
The invention uses a composite structure consisting of the non-magnetic support, magnetic layer with ferromagnetic powder, and back coating layer with controlled protrusions. This composite design allows the back coating layer to provide structural support while its controlled protrusion characteristics prevent harmful recesses in the magnetic layer, thereby preventing dropout
Data Source
AI summary
The magnetic tape includes: a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ε-iron oxide powder, and the number of protrusions having a height of 50 nm or more and less than 75 nm on a surface of the back coating layer is 700 pieces/6400 μm2 or less.