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The coercive field of the as-cast Fe68Si20Nb12 and Fe60Si20Nb20 ribbons decreases with increasing temperature abruptly up to 35K, then slowly up to around 200K. Above this temperature the coercive field increases. Qualitatively this is attributed to the point that this unusual coercive field curve behavior is related mainly to the nano-crystalline material containing two nanocrystalline phases (BCC...
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