| http://www.w3.org/ns/prov#value | - For example, the weight ratio of the first magnetizable particles to permanent magnetic particles may range from about 20:1 to about 5:1, preferably from about 15:1 to about 8:1. [0114] Illustrative examples of suitable permanent magnetic particles include, but are not limited to, samarium cobalt, neodynium-iron-boron, aluminum-nickel-cobalt, iron, including iron oxide, cobalt, misch metal, cerami
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