A Major Step Closer to a Viable Recording Material for Future Hard Disk Drives

Magnetic recording is the main technology underpinning today’s massive information storage. Now, business are racing to establish brand-new hard drive gadgets (HDDs) efficient in recording densities higher than 1 terabit per square inch.

Perpendicular recording HDDs keep information as small locations of “up” or “down” magnetization within a thin layer on the surface areas of the disks. Each small location represents one little details, and increasing the areal density of recordings needs a decrease in bit size.

The catch is that the existing magnetic recording media that depend on perpendicular cobalt-chromium-platinum (CoCrPt) oxide granular movies are reaching their physical limitation– a density of around 750 gigabits per square inch– since thermal changes avoid diminishing the grain size listed below 6 to 7 nanometers. In AIP Advances, from AIP Publishing, a group of scientists in India report their work tweaking the L10 stage, or crystallographic orientation, of an iron and platinum (FePt) alloy as a option.

The L10 stage of the FePt alloy boasts high magnetocrystalline anisotropy, which suggests that it stays thermally steady even at grain sizes as little as 3 nanometers. However the material’s drawback is that it needs a high annealing temperature level (500 degrees to 600 degrees Celsius) to change the transferred disordered stage into a purchased tetragonal L10 stage, raising the expense of production.

“The material’s need for such a high annealing temperature renders it incompatible with industrial processes, as well as causes significant grain growth and an increase in bit size — none of which is desirable,” stated Ajay Gupta, director of the Center for Spintronic Products at Amity University in India.

This has actually led to a technique established by the authors which leads to a substantial improvement of the L10 improvement rate in FePt systems by reducing the buying temperature level listed below 300 degrees C. “This is a major step toward realizing L10 FePt as a material for high density perpendicular recording,” Gupta stated.

L10 FePt as a perpendicular recording media might one day be able to increase the magnetic recording density in HDDs beyond 1 terabit per square inch. “Our work overcomes one of the main challenges by reducing the ordering temperature,” stated Gupta. “But there are still other crucial requirements — such as achieving the desired grain orientation — that must be met before it will become viable to use L10 FePt.”

The group is now pursuing a much better understanding of the atomic-level system for the improvement of the L10 improvement rate in FePt, and attempting to enhance the layer structure and densities of the multilayer structure to accomplish peak improvement. “We’re working on the desired grain orientation for producing perpendicularly magnetized media by selecting the proper underlayer of material over which FePt will be deposited,” Gupta stated.

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