I'm looking at having to design a custom relay with not a lot of space for magnetics. I have space for a long coil and am looking to drive it with as much flux density as possible. For production, I'm guessing that a powder metal part is the way to go. For prototyping, what would be a good choice for about a 3/8 diameter armature round? I'll be turning part of it down and am o.k. with having to anneal it afterwords.
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