Interface Wall Energy in Exchange-Coupled Magneto-Optical Recording Films

Abstract

Exchange-coupled double-layered (ECDL) films were adopted to increase density of magnetically induced super-resolution (MSR) media by using center aperture detection scheme, and to improve sensitivity of switching field simultaneously. A carrier to noise ratio of 40 dB was obtained at 0.5 µ m recording marks produced by a switching field of 75 Oe. Temperature dependence of interface wall energy affects recording/playback characteristics of ECDL MSR disks considerably.

High magnetization exchange-couple double-layer TbFeCo for magnetic flux reading optical recording

“…(3) and (4) and (5) From (3) and (4), and the value from VSM measurement, the interface energy for 20 nm memory layer and 20 nm readout layer is about 4.1 erg/cm .…”

“…Commonly used single-layer MO film can not meet these requirements since net magnetization of the films must be small at room temperature in order to diminish the influence of demagnetic field in thermo-magnetic writing process. Exchange-coupled dual-layer (ECDL) films have been investigated as conventional MO recording media [3], [4]. Yet, Mr and coercivity reported are not adequate to yield higher flux density and to ensure domain stability simultaneously.…”