| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic head having a troidal coil which is small in magnetic path length and small in DC current value. SOLUTION: The film thickness t2 of a second coil layer (second coil piece) 108 arranged below a main magnetic pole layer (first magnetic layer) 110 is set larger than the film thickness t1 of a first coil layer (first coil piece) 115. Thus, even while the film thickness t1 of the first coil layer (first coil piece) 115 arranged in a space 122 between the main magnetic pole layer (first magnetic layer) 110 and a return path layer (second magnetic layer) 117 is reduced to reduce the magnetic path length of a magnetic flux flowing through the main magnetic layer (first magnetic layer) 110 and the return path layer (second magnetic layer) 117, the DC resistance value of the entire coil layer is reduced by increasing the film thickness t2 of the second coil layer (second coil piece) 108. COPYRIGHT: (C)2006,JPO&NCIPI
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