Magnetically soft, high saturation magnetization laminates of iron-cobalt-nitrogen and iron-nickel

A device comprising:

• a solid body having a leading end, a trailing end and a media-facing surface;
• an electrically conductive coil disposed in said body and including a plurality of adjacent coil sections oriented substantially parallel to each other;
• and
• first and second pole layers disposed in said body adjacent to said coil sections, said second pole layer disposed closer than said first pole layer to said trailing end, at least one of said pole layers including a structure having a plurality of FeCoN films interleaved with a plurality of FeNi films, each of said films having an atomic concentration of iron that is at least fifty percent, magnetic saturation of at least about twenty-three-thousand Gauss, and having a magnetic coercivity measured substantially along said hard axis of less than two Oersted.

A device comprising:

• a solid body having a leading end, a trailing end, and a media-facing surface;
• an electrically conductive coil disposed in said body and including a plurality of adjacent coil sections oriented substantially parallel to each other;
• and
• a magnetic loop substantially encircling and electrically isolated from said coil sections, said loop including first and second ferromagnetic pole tips that are disposed adjacent to said media-facing surface and separated from each other by nonferromagnetic material,
• wherein at least one of said pole tips includes a plurality of primarily-iron, cobalt-containing layers interleaved with a plurality of primarily-iron, nickel-containing layers, such that said pole tip has a magnetic saturation in excess of 23-kiloGauss, a hard axis coercivity of less than 2 Oersted and a permeability of at least 1500.

A device comprising:

• a first plurality of layers containing (FeACoBNC)(1−Y)XY, where X is an element from the group consisting of V, Cr, Ir, Ni, Rh, Mo, W, Nb and Ti, having atomic concentrations of A≧0.5, B≦0.5, 0≦C≦0.2, 0≦X≦0.1, and wherein A+B+C=1;
• and
• a second plurality of layers containing FeSNi1−S, having atomic concentrations of S≧0.3;
• wherein said first and second plurality of layers are interleaved to form a structure having an easy axis of magnetization and a hard axis of magnetization, having a magnetic saturation of at least about twenty-three-thousand Gauss, and having a magnetic coercivity measured substantially along said hard axis of less than two Oersted.