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Invar can be used as magnetic core material, but there are better choices. Invar is alloyed for its thermal stability. It is iron with a good percentage of nickel. Remember that magnetic core material is usually laminated or is "powdered" in a way to electrically isolate the "bits" of core material so eddy currents will be reduced. A link is posted to the article on Invar put up by our friends at Wikipedia, where knowledge is free.

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โˆ™ 2008-02-19 07:08:04
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Q: Can INVAR alloy be used as a magnetic core?
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