The Development on Areal Density of Magnetic Recording

 With the development in magnetic recording, people will seek for higher areal density. To raise the areal density without damaging signal to noise ratio (SNR) and thermal stability, several methods have been proposed after many years of research. This passage will introduce two major approaches, heat assisted magnetic recording (HAMR) and composite media. Besides, the evaluation for two methods will also be discussed in the passage. Apart from these two methods, a new method trapping electron assisted magnetic recording (TEAMR) will also be mentioned in the final of the passage. In conclusion, HAMR is faced with many problems in fabrication, composite media has many improvements to take full advantage of it and TEAMR is promising but costs much nowadays.