- DesignGuide 2
- Effects of
Stripe Width &
Optimum Magnetic Head Performance
By Larry W. Ditty, Executive V. P. Technology, brush Industries, Inc.
- Magnetic Core Materials
- Mumetal
- ASTM A-753-78 Alloy
- Fe Ni
- Hardness Rb 58
- Hypermium™ I
- ASTM A-801 Alloy Type 1
- Fe Co V
- Hardness Rc 25
- Annealed to brush proprietary specifications
- HypermiumII™
- ASTM A-596 Alloy
- Fe Ni Mn
- Hardness Rb 62
- Annealed to brush proprietary specifications
- Supermium®
- Al Fe Si
- Hardness Rc 50
- Processed for enhanced magnetic characteristics, increased hardness and reduced grain size
- Supermium® 2.75
- Al Fe Si
- Hardness Rc 50
- Material specially processed to produce core laminations for high coercivity, 2750 Oersted media and high frequency applications
- Supermium® 3.5
- Al Fe Si
- Hardness Rc 50
- Processed to produce core laminations. A proprietary magnetic head fabrication process produces a magnetic head capable of encoding high coercivity media up to 3500 Oersted
- CC (Ceramic Coat)
- Hardness Rc 60
- Plasma sprayed coating of AlO2 and TiO2 producing a hard wear surface
- The effect of window or stripe width on ceramic
coated magnetic head performance.
On ceramic coated magnetic heads the width of area of magnetic cores presented to the media is determined by the window width at ceramic coating. The optimum width dimension is dependent upon the mechanical hardness of the magnetic core material. - Soft core materials such as Hy-Mu 80 with window width > .020 inches exhibit short operating life due to head scalloping causing spacing loss failure. The solution has been to narrow the stripe width to a recommended .008 to .016 inches. However it must be recognized the narrow window limits the magnetic head to use with low coercivity media and a narrow window width tends to increase manufacturing costs.
- One hard core material, Supermium®, which has a material hardness approaching Ceramic is not subject to scalloping. A larger more cost effective window width can therefore be used. The recommended window width for Supermium® .030 to .040 inches. At the wider width Supermium® does not suffer scalloping and allows high coercivity (2750 oer) performance.
- By Larry W. Ditty
- Executive V. P. Technology
- brush Industries, Inc.
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