Electrodeposited CoNiFeP soft-magnetic films for high-frequency applications

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posted on 2010-09-03, 10:29 authored by Fernando M.F. Rhen, Saibal Roy

We have studied the influence of P and of plating current density on static/dynamic magnetic and electrical properties of CoNiFe high moment alloy. We found that morphology, electrical and magnetic properties of films with P content up to 10 at. % are quite different from those of pure CoNiFe. CoNiFeP morphology consists of a structure made of isolated islands with sizes varying between 10 and 50 μm. We indirectly obtained resistivity in this structure by using high-frequency magnetic measurements. Film composition is weakly dependent on plating current density for values larger than 10 mA cm-2. Coercivities increase up to 6400 A m-1 and magnetization saturation is reduced to 1.0 T in CoNiFeP films. The most remarkable effect of P addition to CoNiFe is the increase of resistivity over two order of magnitude with values of 5.2 x10[power]-5Ωm compared to 2.4 x10[power]-7Ωm of pure CoNiFe.We also found that the ferromagnetic resonance of CoNiFeP alloy is 3 GHz for sample with 10 at. % P and a performance factor (BF) of ~4x10[power]5 Ts-1, which is a better performance than bulk ferrite.

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EI, SFI

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