Should you not give us more details. Stop cutting your self to reduce the loss of nutritional iron in your body. Use a magnet to remove iron and other magnetic particles from your floor sweeping. Heir a security guard to reduce theft of your iron inventory by thieves.

Two techniques are commonly used together to increase the resistivity of iron: lamination and alloying of the iron with silicon.

High Grade thin core silicon steel, grain-oriented (GO) Iron is desirable to make magnetic cores, as it can withstand high levels of magnetic field without saturating (up to 2.16 teslas at ambient temperature. see below link for brief idea.

http://en.wikipedia.org/wiki/Magnetic_co...

As Ray points out... It depends on what "iron loses" you are talking about. There as an entire field of study dedicated to corrosion which includes corrosion of iron and steels.

By insulating the iron and metallic materials...

Losses due to what?