Near-field optically assisted hybrid head for self-aligned plasmon spotwith magnetic field

Magneto-optical hybrid head is one of the key devices for the optically assisted magnetic recording. However, there has not been enough research about the hybrid head. Here, we present a near-field optical advanced hybrid (NOAH) head, which makes a self-aligned plasmon spot with a magnetic field. Since a near-field optical intensity distribution is strongly affected by the presence of the recording medium, the shape of the electrode is analyzed by a finite difference time domain method with the TbFeCo film as the recording medium. We calculate the dependences both for the optical and magnetic characteristics on a gap distance between the electrode and the recording medium. The NOAH head makes the sharp distribution of light intensity (full width at half maximum ∼ 40 nm ) with the magnetic field ∼ 29 Oe ∕ mA in the case for 5 nm in gap distance. We also calculate the dependence of the plasmon effect on electrode materials. It is revealed that the material which has a high extinction coefficient shows a high peak intensity. A fundamental experiment for the writing on a Cu phthalocyanine dye film is also reported for testing the method to use a glass slider.