Method and system for providing high magnetic flux saturation CoFe films
View Patent ↗A method and system plates CoFeX, where X is an insertion metal. The method and system include providing a plating solution including hydroxymethyl-p-tolylsulfone (HPT). The plating solution being configured to provide a CoFeX film having a high saturation magnetic flux density of greater than 2.3 Tesla and not more than 3 weight percent of X. The method and system also include plating the CoFeX film on a substrate in the plating solution. In some aspects, the plated CoFeX film may be used in structures such as main poles of a magnetic recording head.
1. A method for plating CoFeX, where X is an insertion metal comprising:
providing a plating solution including hydroxymethyl-p-tolylsulfone (HPT), the plating solution being configured to provide a CoFeX film having a high saturation magnetic flux density of greater than 2.3 Tesla and not more than 3 weight percent of X; and plating the CoFeX film on a substrate in the plating solution, wherein plating solution further comprises CoSO 4 , FeSO 4 , NaCl, boric acid, and sodium lauryl sulfate.
2. The method of claim 1 wherein X includes at least one of Ni, Rh, Cr, Ru, Pt, Pd, and Mn.
3. The method of claim 1 wherein the step of configuring the plating solution further includes setting a pH of the plating solution to be at least 2 and not more than 3.
4. The method of claim 1 wherein the step of configuring the plating solution further includes setting a concentration of the HPT to be at least 0.001 and not more than 0.1 grams per liter.
5. The method of claim 4 wherein the concentration of HPT is at least 0.005 and not more than 0.025 grams per liter.
6. The method of claim 5 wherein the saturation magnetic flux density is at least 2.35 T.
7. The method of claim 6 wherein the saturation magnetic flux density is at least 2.4 T.
8. The method of claim 1 wherein the step of plating the CoFeX film further includes:
plating the CoFeX film using a direct current.
9. The method of claim 1 wherein the step of plating the CoFeX film further includes:
plating the CoFeX film using a pulsed current.
10. The method of claim 9 wherein the CoFeX film includes at least fifty-five and not more than eighty weight percent of Fe.
11. The method of claim 9 wherein the CoFeX film includes at least sixty and not more than sixty five weight percent Fe.
12. The method of claim 1 wherein the step of plating the CoFeX film further includes:
terminating the plating when the CoFeX film has a thickness of at least 0.1 micron and not more than two microns.
13. The method of claim 1 wherein the CoFeX film as plated has a hard axis coercivity of less than or equal to two Oe and an easy axis coercivity of less than or equal to six Oe.
14. A method for providing a write head comprising:
providing a plating solution including hydroxymethyl-p-tolylsulfone, CoSO 4 , FeSO 4 , NaCl, H 3 BO 3 , and sodium lauryl sulfate, the plating solution having a pH of not more than three and not less than two, the plating solution being configured to provide a CoFe film for a write pole having a high saturation magnetic flux density of greater than 2.35 Tesla, and having a composition of 60-65 weight percent of Fe; and plating the CoFe film for the write head on a substrate in the plating solution.
15. The method of claim 14 wherein the step of providing the plating solution further includes:
maintaining the plating solution at a temperature of at least fifteen and not more than thirty-five degrees Celsius.
16. The method of claim 15 wherein the temperature is at least eighteen and not more than twenty-four degrees Celsius.