Corrosion resistant amorphous magnetic alloys
AssigneeRead-Rite Corporation
InventorDaniel A. Nepela
Life of this patent
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Abstract
The magnetic metal composition of a Co-based alloy includes additives to produce an amorphous condition in the alloy and also includes amounts of Rh to increase the corrosion resistance of the alloy. By adding the amorphous-producing materials and selected amounts of Rh, the corrosion resistance of the resulting Co-based alloys has been found to be considerably improved over that of the base amorphous Co alloy without rhodium.
Claims5
An amorphous magnetic metal alloy for forming thin film magnetic heads having high corrosion resistance consisting essentially of
- Ta Tb Tc where
- Ta includes a atomic % of Co;
- Tb includes b atomic % of Rh;
- and
- Tc includes c atomic % of Zr,
- said alloy being characterized by
- 70.ltoreq.a.ltoreq.90
- 2.ltoreq.b.ltoreq.20
- 2.ltoreq.c.ltoreq.15
- wherein the total atomic % of the elements Co, Rh and Zr of said alloy total 100%, and said magnetic metal alloy has a saturation magnetic induction Bs of at least 12,000 Gauss, and a saturation magnetostriction constant .lambda.s no greater than 1.0.times.10.sub.-6.
An amrphous magnetic metal alloy for forming thing film magnetic heads having high corrosion resistance consisting essentially of
- Ta Tb Tc Td
- where Ta indicates a the atomic % of Co;
- Tb indicates b atomic % Rh;
- Tc indicates c atomic % of Zr;
- Td indicates d atomic % of at least one of Pt, or Pd;
- said alloy being characterizied by
- 70.ltoreq.a.ltoreq.90
- 2.ltoreq.b.ltoreq.15
- 2.ltoreq.c.ltoreq.15
- 3.ltoreq.d.ltoreq.20
- wherein the total atomic % of the elements Co, Rh, Zr, Pt and/or Pd of said alloy total 100%, and said magnetic metal alloy has a saturation magnetic induction Bs of at least 12,000 Gauss, and a saturation magnetostriction constant .lambda.s no greater than 1.0.times.10.sub.-6.
An amorphous magnetic metal alloy having high corrosion resistance said alloy consisting essentially of
- Ta Tb Tc
- where
- Ta includes 90 atomic % of Co;
- Tb includes 5.5 atomic % of Rh;
- and
- Tc includes 4.5 atomic % of Zr so that the magnetostriction is 4.times.10.sup.-8 and the corrosion rate is 0.44 that of 81:19 NiFe;
- wherein the total atomic % of the elements of Co. Rh and Zr total 100%.
Dependencies are inferred from the claim text.