Hello, I have recently been tasked with finding the permeability of iron at a frequency of 10 kHz. I have never done research before, this is my first time, I been looking all over the internet (IEEE, elsevier, ScienceDirect, etc...) for anything that might give me information on the subject. The lowest frequency I could find was at 30 kHz no less than that. I had never posted on a physics forum before, if I posted too much useless information or talked too much I am sorry. I do not know who to turn to for this research question.