Thin film magnetic head with interlayers of multi-layer poles widening to a constant width portion at a receded distance

A thin film magnetic head having at least one write element comprising:

• a first pole portion having a first magnetic film and a second magnetic film;
• a second pole portion;
• and
• a gap film being provided between said first pole portion and said second pole portion, said second pole portion having a third magnetic film and a fourth magnetic film, said third magnetic film being adjacent to said gap film, said fourth magnetic film being adjacent to said third magnetic film, wherein said second magnetic film, said gap film and said third magnetic film have surfaces facing opposite a medium, said surfaces having a width (W21), and said second magnetic film, said gap film and said third magnetic film having a width (W20) larger than said width (W21) at a position receding from said surfaces facing opposite a medium, and extending away with a constant width in a direction away from said surfaces facing opposite a medium, a receding quantity (ΔL) representing the distance from said surfaces facing opposite a medium to a position at which said width (W21) is increased to said width (W20),
• and wherein said fourth magnetic film includes opposite sides that are inclined toward respective opposite sides of said third magnetic film at a predetermined angle less than 90°.