New Recording Method Combining Thermo-Magnetic Writing and Flux Detection

Abstract

We have developed a new perpendicular thermo-magnetic recording method coupled with magnetic flux detection. The resolution is substantially improved by flux detection. Compared to the latest magneto-optical disk drives, the carrier-to-noise ratio of a reproduced signal is 5 dB higher, and the recording density reaches 8.3 Gbit/inch2. Moreover, this recording method has a good affinity to near-field optics, and it is an effective technique for attaining a higher density beyond the super-paramagnetic limitation in longitudinal magnetic recording.

Modeling laser induced lubricant depletion in heat-assisted-magnetic recording systems using a multiple-layered disk structure

“…Heat assisted magnetic recording (HAMR) has been demonstrated to be a promising technology to further increase the areal storage density of hard disk drives beyond 2 Tbits/in 2 (Alex et al 2001;Saga et al 1999;Rausch et al 2006;Xu et al 2006;Kryder et al 2008). In HAMR systems, a pulsed laser beam of nanosecond duration is focused on the magnetic grains to increase the temperature by a few hundred Kelvin and thereby reduce the coercivity of the magnetic material and allow writing of data.…”

Thermomagnetic writing on deep submicron-patterned TbFe films by nanosecond current pulse

“…On the other hand, amorphous rare earth-transition metal (RE-TM) alloys exhibit very large perpendicular anisotropy at room temperature together with high remanent squareness, and their magnetic properties strongly depend on the temperature. Therefore, RE-TM alloys have been practically used as magneto-optical (MO) recording media for a long time [6], and recently, they are investigated as a candidate for the next generation heat-assisted magnetic recording (HAMR) media [7,8]. Because of the suitable magnetic properties to the thermomagnetic writing, RE-TM alloys are considered to be useful as a storage layer in thermally assisted perpendicularly magnetized MRAM.…”

Optical and Thermal Analysis of Nano-Patterned Medium Structure for Near-Field Assisted Recording Using FDTD Method

“…In order to avoid this difficulty, materials with a high coercivity and a high Curie temperature are used for magnetic recording medium. Therefore, heat assisted magnetic recording storage has been proposed 1) . By heating a local area, coercive force decreases, and a magnetic recording materials at the heated area can be written by applying a small magnetic field.…”