Patent ID: 8724260

Claim:
An information recording device that includes a magnetic recording medium configured to store user data, and a magnetic head comprising a write head configured to perform a recording operation to the magnetic recording medium, and the write head configured to apply a high-frequency field and a write magnetic field corresponding to the user data to the magnetic recording medium, in order to form a magnetic resonance state in the magnetic recording medium to perform magnetic recording, the write head comprising: a main pole configured to generate the write magnetic field; an opposing pole arranged on a trailing side or a leading side of the main pole apart from the main pole; and a multilayer material arranged between the main pole and the opposing pole, and configured to generate the high-frequency field, wherein the multilayer material includes a receded section formed at a track direction end section at an air bearing surface of the multilayer material; and wherein for a cross-section of the multilayer material, the cross-section being parallel to both the main pole and the opposing pole, the cross-section has a shape such that the width of the cross-section at the air bearing surface side of the multilayer material is shorter than the width at the side of the multilayer material opposite to the air bearing surface side.