Template-Assisted Direct Growth of 1 Td/in² Bit Patterned Media

Abstract

We present a method for growing bit patterned magnetic recording media using directed growth of sputtered granular perpendicular magnetic recording media. The grain nucleation is templated using an epitaxial seed layer, which contains Pt pillars separated by amorphous metal oxide. The scheme enables the creation of both templated data and servo regions suitable for high density hard disk drive operation. We illustrate the importance of using a process that is both topographically and chemically driven to achieve high quality media.

Spin wave computing using pre-recorded magnetization patterns

“…2) includes two magnetic layers. In the bias layer there are nanodots each of which can be reversed independently 6,7 .…”

“…Let us proceed with a numerical demonstration of a few simplistic algorithms. We assume the bias layer is made from a FeCo alloy with the saturation magnetization 𝜇 𝑀 = 1.2 T, magnetic anisotropy field 0.9T 6,7 , damping coefficient 𝛽 = 0.06, patterned as a periodic array of magnetic dots with a square cross-section (Fig. 1), 15nm thick, with center-to-center distance of 24nm and 12nm separation between the dots.…”

Increasing Magnetic Anisotropy in Bimetallic Nanoislands Grown on fcc(111) Metal Surfaces

“…This forces one to chose materials with high magnetic anisotropy energy (MAE) per atom, which requires large switching fields. Novel magnetic recording materials [ 3 , 4 ], bit patterned media (BPM) [ 5 ], and novel writing technologies, such as heat-assisted magnetic recording (HAMR) [ 4 , 6 ], are investigated to enable HDDs with increased storage densities.…”

Investigation of writing error in staggered heated-dot magnetic recording systems

“…For example, a directed self-assembly of nanoparticles has been interested because of large area patterning. [13][14][15][16][17] Nonetheless, this technique still has some challenges such as controlling island size distribution, obtaining small island size, and fabricating perfect templates or masks. 18 Besides the island size fluctuation, the written-in error can also be caused by bit island position jitter, main pole position fluctuation, heat spot position, and so forth.…”