The manufacturer I want to recommand is REMA-CN, which supplies so-called Terfenol-D, aka rare earth magnetostrictive alloy.
Well, it seems odd that there is no such an entry in Wikipedia. But it does exist. We can say it is one type of rare earth magnet or one type of rare earth alloys. Among them, I want to mention here is a special one: Terfenol-D. It is categorized into rear earth alloys in Wikipedia, according to which, 'Terfenol-D, an alloy of the formula TbxDy1-xFe2 (x ~ 0.3), is a magnetostrictive material.'
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