# Why Ferrites are used as a cores for inductors

Why specifically we use the ferrites as a core for the inductors? For example a NiZn toroid as a core for an inductor?

• Because they have a higher resistivity than metals and are cheaper than powder cores. Apr 7 '19 at 19:52
• It wasn't obvious to me until I made some research, but I believe OP is talking about "Nickel-zinc ferrite", $\text{Ni_aZn_{(1-a)}Fe_2O_4}$, (found here) and not Nickel-Zinc batteries. Apr 7 '19 at 19:56
• What have you read so far? en.wikipedia.org/wiki/Ferrite_core and product.tdk.com/info/en/catalog/datasheets/… There are two material types and MANY variations of both. Apr 7 '19 at 20:02
• Which other magnetic materials (and their electromagnetic properties) did you research before asking this question? Apr 7 '19 at 21:12
• Hint: as mentioned by others, eddy effects are the main reason. Note how low-frequency AC inductors use laminated Si-steel cores, and then consider what happens as frequency increases. Ferrites are made of very small particles.sintered together. Apr 8 '19 at 2:26