Abstract: A coated member manufacturing method includes: an application step for applying a magnesium hydroxide solution on a surface of a Fe—Co-based alloy base material; and a baking step for baking the base material after the application step at 600-900° C. to form a magnesium oxide coating on the base material. This coated member has, on a Fe—Co-based alloy base material, a baked coating of magnesium oxide having a lattice constant of 4.20-4.23 ?.

Abstract: Along with higher performance of products, materials are also required to achieve both a high strength and favorable magnetic properties according to applications of products. Therefore, the present invention provides an Fe—Co-based alloy bar which enables both a high strength and favorable magnetic properties to be achieved. An Fe—Co-based alloy bar contains 30% to 80% of crystal grains having a grain orientation spread (GOS) value of 0.5° or more in terms of an area ratio, and having an average crystal grain size number of more than 8.5 and 12.0 or less. The Fe—Co-based alloy bar of the present invention has a high 0.2% yield strength after magnetic annealing so that it can support various high-strength applications.