Magnetic recording and reproducing device comprising a magnetic head including a trailing shield and first and second shields having alternating magnetic and nonmagnetic layers

A magnetic head, comprising:

• a first shield;
• a second shield;
• a magnetic pole provided between the first shield and the second shield;
• and
• a trailing shield separated from the magnetic pole in a first direction crossing a direction from the first shield toward the second shield,
• the first shield including a plurality of first magnetic layers and a plurality of first nonmagnetic layers arranged alternately along a first stacking direction crossing the first direction, the first nonmagnetic layers including at least one selected from the group consisting of Ru, Cu, and Cr, thicknesses of the first nonmagnetic layers each being not less than 0.3 nanometers and not more than 2.2 nanometers,
• the second shield including a plurality of second magnetic layers and a plurality of second nonmagnetic layers arranged alternately along a second stacking direction crossing the first direction, the second nonmagnetic layers including at least one selected from the group consisting of Ru, Cu, and Cr, thicknesses of the second nonmagnetic layers each being not less than 0.3 nanometers and not more than 2.2 nanometers.