Current transformer of energy

I would like to ask about Permalloy:   1. Can Permalloy be used as the core of a 30kHZ transformer?   2. Can Permalloy be milled? I hope you can help answer this question! Permalloy is a metal alloy material with very low resistivity and drastically increased high-frequency loss. It can generally only be used in the low-frequency range.   At the frequency of 30khz, it is recommended to use manganese-zinc ferrite material, which is still cheap.   Permalloy is generally a strip material, most of which are wound or laminated, and generally do not require milling.   Permalloy of conventional thickness cannot meet the working requirements at a frequency of 30kHz. Ultra-thin strips with a thickness of less than 0.05 are required to have a chance.   Permalloy can be made into strips and rods. Rod materials can be milled, but because Permalloy is soft, it has high requirements for milling tools.