Magnetic head having magnetic layers of varying thickness and magnetic recording device

A magnetic head, comprising:

• a first magnetic pole;
• a second magnetic pole;
• a magnetic element provided between the first magnetic pole and the second magnetic pole in a first direction from the first magnetic pole to the second magnetic pole,
• the magnetic element including:
• a first magnetic layer provided between the first magnetic pole and the second magnetic pole,
• a second magnetic layer provided between the first magnetic layer and the second magnetic pole,
• a third magnetic layer provided between the second magnetic layer and the second magnetic pole,
• a fourth magnetic layer provided between the third magnetic layer and the second magnetic pole,
• the first magnetic layer including a first face facing the first magnetic pole,
• the fourth magnetic layer including a second face facing the second magnetic pole,
• a first area of the first face being larger than a second area of the second face,
• a first nonmagnetic layer provided between the first magnetic pole and the first magnetic layer;
• a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
• a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer;
• a fourth nonmagnetic layer provided between the third magnetic layer and the fourth magnetic layer;
• and
• a fifth nonmagnetic layer provided between the fourth magnetic layer and the second magnetic pole, wherein
• a first thickness of the first magnetic layer along the first direction is thicker than a second thickness of the second magnetic layer along the first direction, and
• a third thickness of the third magnetic layer along the first direction is thinner than a fourth thickness of the fourth magnetic layer along the first direction.