Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 1: Joint Symposium "Tailoring Magnetism in L10-ordered Nanostructures: Perspectives for Magnetic Recording beyond 1 Tb/in2" (SYTM)
MA 1.1: Hauptvortrag
Montag, 26. März 2012, 09:30–10:00, H 0105
Thermally Assisted Magnetic Recording at 620 Gb/in2 using Granular L10 FeCuPtAg-X Media — •D. Weller, O. Mosendz, S. Pisana, T. Santos, G. Parker, J. Reiner, and B. C. Stipe — Hitachi Global Storage Technologies, San Jose Research Center, San Jose, CA USA
Highly L10-ordered FeCuPtAg-X (X=C, BN, ...) nano-granular thin films as potential thermally-assisted magnetic recording (TAR) media have been studied. These films are fabricated in a flexible sputter system allowing deposition of appropriate adhesion, heat sink and structural seed layers before growing FeCuPtAg-X at elevated temperature to induce chemical L10 ordering and to optimize grain size, grain distribution and texture. Typical seed layers are 5-10 nm thick MgO (002) with rocking curve widths of FWHM ∼4 deg. Granular FeCuPtAg-X films with thickness of ∼7 nm and well isolated grains have room temperature coercivities up to ∼5 T, depending on growth temperature and grain isolation. The Curie temperature is reduced to 600-650K by adding about 10 at% Cu, which is used to adjust (lower) the heating power needed during recording. So far, static tester experiments on our best optimized media using a TAR head demonstrate areal densities up to AD∼620-650 Gbits/in2. The goal is to optimize media and extend AD beyond Tb/in2, which is one of the key projects going forward.
While the focus of this talk is on heat assisted magnetic recording (HAMR or TAR), we will also mention alternative technologies to move beyond the superparamagnetic limit of today’s perpendicular magnetic recording (PMR). These include Shingled Write Recording (SWR), Microwave Assisted Magnetic Recording (MAMR) and Bit Patterned Magnetic Recording (BPMR).