Magnetically soft, high saturation magnetization laminates of iron-cobalt-nitrogen and iron-nickel for magnetic head pole layers

A magnetic head comprising:

• a first layer containing NiFe having an atomic concentration of iron that is at least thirty percent and not more than seventy percent;
• a second layer that adjoins the first layer and contains FeCoN having an atomic concentration of iron that is greater than the second layer's atomic concentration of cobalt, having an atomic concentration of nitrogen that is less than the second layer's atomic concentration of cobalt and less than three percent;
• and
• a third layer containing FeCoNi having an atomic concentration of nickel that is less than eight percent, having an atomic concentration of cobalt that is less than the third layer's atomic concentration of iron and greater than the third layer's atomic concentration of nickel, the third layer adjoining only one of the first and second layers.

A magnetic head comprising:

• a first plurality of layers each containing NiFe having an atomic concentration of iron that is at least about thirty percent;
• a second plurality of layers that is interleaved with the first plurality of layers, the second plurality of layers each containing FeCoN having an atomic concentration of iron that is greater than an atomic concentration of cobalt, and having an atomic concentration of nitrogen that is less than the atomic concentration of cobalt, the atomic concentration of nitrogen being less than eight percent;
• and
• a layer containing FeCoNi that adjoins one of the layers containing NiFe or one of the layers containing FeCoN.

A disk drive comprising:

• a disk including a magnetic media layer;
• and
• a magnetic head including:
• a first layer containing NiXFe(1-X), wherein 0.3≦X≦0.7;
• a second layer containing FeYCoZN(1-Y-Z), wherein 0.5≦Y≦0.8 and 0<(1-Y-Z)≦0.03, and the second layer adjoins the first layer;
• and
• a third layer containing FeACoBNi(1-A-B), wherein 0.6≦A≦0.7, 0.1≦(1-A-B)≦0.08 and the third layer adjoins only one of the first and second layers.