Magnetic head having first and second protective films with different coefficients of linear expansion

A magnetic head comprising:

• a substrate;
• a read head including a magnetoresistive element, a first shield, and a second shield;
• a write head including a magnetic pole and a coil;
• a first protective film having a first coefficient of linear expansion;
• and
• a second protective film having a second coefficient of linear expansion smaller than said first coefficient of linear expansion,
• wherein said first and second protective films are formed parallel to a direction of which said first and second shields are formed and said second protective films is stacked on said first protective film in a thickness direction of the magnetic pole,
• wherein said second protective film is recessed against the air bearing surface of said magnetic pole.

A manufacturing method of a magnetic head comprising steps of:

• forming a read head above a slider substrate;
• forming a write head above said read head;
• forming a first and second protective films above said write head, said second protective film stacked on said first protective film in a thickness direction of said both read and write heads;
• and
• machining an air bearing surface of said slider substrate after forming said first and second protective films,
• wherein a coefficient of linear expansion of said first protective film is larger than a coefficient of linear expansion of said second protective film, and
• wherein said second protective film is recessed from said air bearing surface of said write head.