Hello, I am working on a product that uses a cylinder shaped neodymium magnet that is 1/2 inches long and has a diameter of 1/8 inch. It will be held in place by a piece of magnetic metal, with a .05 inch piece of plastic separating the magnet and magnetic metal. My question is what type of material should the 'magnetic metal' piece be made from? Iron, steel, etc? I want the strongest 'pull' factor between the magnet and metal piece, but as the function of this assembly is to measure the amount of force it takes to 'pull' the magnet away from the magnetic metal I need a magnetic metal that will resist getting more magnetized over time because of the close proximity to the magnet, which in turn would change the amount of force required to separate the two, giving different readings over time (I think that will happen, if not let me know). Are there metals like this out there, or is it just the nature of magnetism that the more 'pull' a material has, the more it will get magnetized over time when in proximity to a magnet. Hope that all made sense!
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