Yes, Invar is a magnetic alloy with a composition of 36% nominal nickel and the balance iron. Iron, nickel, and cobalt are elemental metals that are magnetic below their Curie points. Alloys can be magnetic if they contain these elements. However, Invar is not used for its magnetic properties. It is used for its low expansion characteristics, the lowest of any known alloy (approx. one-tenth of carbon steel at temps up to 400°F). Invar is particularly useful in applications that require minimum thermal expansion and high dimensional stability.