Effect of Zr and Nb additions on the high-frequency magnetic properties of Co85-(x+y)Zr3+xNb12+y films

This high-frequency magnetic properties of 250-nm-thick Co85-(x+y)Zr3+xNb12+y (x: 0–5.5, y: 0–11.0) amorphous films are examined as functions of Zr (x) and Nb (y) concentrations. Both x and y influence the high-frequency magnetic properties. In the case of x < 3.0 and y ≤ 5.0, each permeability spectrum appears, but increasing x and y decreases the ferromagnetic resonance (FMR) frequency from 1.20 GHz to 0.41 GHz and increases the effective damping constant from 0.15 to 0.43. For x = 3.0 and y = 8.2, although the permeability spectrum disappears, the effective damping constant is estimated to be approximately 0.82. In contrast, the high-frequency magnetic properties cannot be obtained for x = 5.5 and y = 11.0. Hence, appropriately selecting both Zr and Nb concentrations should effectively control the high-frequency magnetic properties. This finding should be of interest from the viewpoint of new thin film applications, such as microscopic electromagnetic compatibility (EMC), in which properly adjusting th...

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