I would like to know how grain size affect the magnetic permeability for soft magnetic material i.e. FeCo2V, Fe-Ni alloy
An early paper on this question was addressed by Giselher Herzer at Vacuumschmelze: Article Grain size dependence of coercivity and permeability in nano...
In this paper, his Fig 6 provides a near-direct answer to your question. Coercivity and permeability are inversely related to each other, so Herzer's finding of decreasing Hc with grain size (for grains larger than 1 micron) means increasing permeability with grain size, in that size range.
The same information can be found open source in:
http://www.vacuumschmelze.com/fileadmin/documents/pdf/fipublikationen/Nano_1997.pdf
and in other locations. There is almost nothing else published on this question.
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