Mixed magnetic powders for making a magnetic core or body is disclosed, wherein the mixed magnetic powders comprises: a first magnetic powder; a second magnetic powder, wherein the first magnetic powder and the second magnetic powder are made of a same soft magnetic material, wherein the ratio of the D50 of the first magnetic powder to the D50 of the second magnetic powder is in the range of 5 to 12, wherein the first magnetic powder weighs 50 to 90 percent of the total weight of the first magnetic powder and the second magnetic powder; and the second magnetic powder weighs 10 to 50 percent of the total weight of the first magnetic powder and the second magnetic powder.