All-optical magnetic recording system using FeMnPt media

摘要

An “all optical switching” (AOS) magnetic recording system, i.e., one that does not require a magnetic field to reverse the magnetization in the magnetic recording media, uses a FeMnPt L10 alloy as the magnetic media. A FeMnPt alloy, with appropriate amounts of Mn, will have high magneto-crystalline anisotropy, but also ferrimagnetic spin alignment for triggering AOS. The combination of high magneto-crystalline anisotropy and ferrimagnetic spin configuration enables the FeMnPt media to function as magnetic media whose magnetization can be switched solely by polarized laser pulses. The FeMnPt media for may be a single layer with or without any segregants. Alternatively, the FeMnPt media may be a multilayered recording layer comprising alternating layers of FePt and MnPt L10 ordered alloys. The segregant-free embodiments of the FeMnPt material may be patterned to form bit-patterned-media (BPM).

主权项

1. An all-optical magnetic recording system comprising:
a magnetic recording medium comprising a generally planar substrate and a continuous non-bit-patterned magnetic recording layer on the substrate, the recording layer comprising a FeMnPt alloy wherein Mn is present in said alloy in an amount greater than or equal to 1 atomic percent and less than or equal to 15 atomic percent; a laser for generating light; a polarizer for polarizing the laser light; means for directing the polarized laser light to the recording layer to switch the magnetization of regions of the recording layer; andwherein the system does not include a write head for generating a magnetic field.