High-Density Magneto-Optical Recording With Domain Wall Displacement Detection

Abstract

In this paper we propose a new method to reproduce signals from high-density recorded patterns irrespective of the resolution of the readout optical system. The basic mechanism of this method, that is, domain wall displacement due to the temperature gradient, was confirmed by direct observation through a polarizing microscope. A clear readout waveform and a CNR of 39.5dB were obtained for a mark length of O.l,um with this method.

Magnetic properties and microcolumnar structure of a TbFeCo memory layer for high-density magneto-optical recording

“…One was a 0.6 mm polycarbonate substrate/SiN ͑35 nm͒/TbFeCo ͑100 nm͒/SiN ͑50 nm͒ and the other was a SiN ͑35 nm͒/with magnetic underlayers of GdFeCoCr/TbFeCoCr ͑60 nm͒/TbFeCo ͑100 nm͒/SiN ͑50 nm͒, designed with a structure that acts as a domain wall displacement detection system. 6,7 The magnetic properties were measured with a vibrating sample magnetometer, a torque magnetometer, and a Kerr magnetometer. The surface and cross-sectional structures of the films were observed using scanning electron microscopy ͑SEM͒, and an atomic force microscope.…”

Wall structure and energy on DWDD

“…Layer structure in Fig. 9(a) is the same as began to seep in the D-layer, and finally, two walls were created in the D-layer (2). In this case, the right wall in the D-layer was caught by the right wall in the M-layer (3).…”

Sputtering gases and pressure effects on the microstructure, magnetic properties and recording performance of TbFeCo films

“…These media were designed with a layer structure that acts as a domain wall displacement detection system, which evaluates their static magnetic properties as well as their recording and readout properties [9,10].…”