Editing Magnetic core (section)

==== Sendust, KoolMU ====
An alloy of 6% aluminium, 9% silicon, and 85% iron. Core losses higher than MPP. Very low [[magnetostriction]], makes low audio noise. Loses inductance with increasing temperature, unlike the other materials; can be exploited by combining with other materials as a composite core, for temperature compensation. Saturation flux of about 1 tesla. Good temperature stability. Used in switching power supplies, pulse and flyback transformers, in-line noise filters, swing chokes, and in filters in [[phase-fired controller]]s (e.g. dimmers) where low acoustic noise is important.<ref name="coilws"/>

Absence of nickel results in easier processing of the material and its lower cost than both high-flux and MPP.

The material was invented in Japan in 1936. It is usable up to about 500&nbsp;kHz to 1&nbsp;MHz, depending on vendor.<ref name="chalmers"/>