Patent ID: 7230793

Claim:
A magnetic recording head for recording information on and/or reproducing information from an information storage medium comprising a substrate and a magnetic recording layer which is stacked on the substrate and on which recording is performed in a predetermined magnetic recording direction, the magnetic recording head comprising: a head body having an end divided into two parts, the two parts facing each other with a predetermined distance therebetween; first and second poles that are disposed on the two parts of the head body, respectively, to form a magnetic path and that face each other with a predetermined gap therebetween; and an anisotropic medium that is interposed between the first and second poles and has a magnetic anisotropy, wherein a magnetic field going into the predetermined gap decreases so as to be induced in the predetermined magnetic recording direction, and wherein when a longitudinal size of a portion of the first pole facing the information storage medium is U h and a length of the anisotropic medium perpendicular to the magnetic recording layer is A l , the size of the anisotropic medium is determined using Equation below: 1 ≤ U h A l ≤ 4.