Sendust

Sendust ( Japanese:センダスト) is a magnetic metal powder, which was developed in 1936 at the Imperial Tohoku University in Sendai, Japan as an alternative to permalloy in coils for telephone networks. The name is a portmanteau, meaning dust (English: dust ) from Sendai: Sen -dust. The sendust alloy typically consists of 85 % iron, 9% and 6% silicon aluminum. The powder is sintered to form magnetic cores for coils. Sendust cores have a high magnetic permeability, low magnetic losses and a good temperature stability.

Sendust is harder than permalloy and is therefore useful for abrasive applications such as endangered heads in audio recording equipment. For modern applications in the field of video and data recordings it is not suitable due to poor high- frequency response.