Study of Flying Stability of a Thermally Assisted Magnetic Recording System with Laser Diode Mount Light Delivery

Choi, Jihun; Park, No Cheol; Park, Kyoung Su; Park, Young Pil

doi:10.7567/jjap.52.09lf02

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…However, exceeding 1 Tbit per inch 2 storage density is not possible with the latter techniques 9 and hence further developments are essential. The next generation of high density recording technologies such as thermally assisted recording (TAR) 10,11 combined with bit patterned media (BPM) 12,13 extends the theoretical storage limit as high as 20 Tbit per inch 2 . 14 In order to develop efficient BPM devices, there is a strong demand for nanosystems with an ordered structure.…”

Section: Introductionmentioning

confidence: 99%

Evolution of magnetism on a curved nano-surface

et al. 2015

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To design custom magnetic nanostructures, it is indispensable to acquire precise knowledge about the systems in the nanoscale range where the magnetism forms. In this paper we present the effect of a curved surface on the evolution of magnetism in ultrathin iron films. Nominally 70 Å thick iron film was deposited in 9 steps on 3 different types of templates: a) A monolayer of silica spheres with 25 nm diameter b) a monolayer of silica spheres with 400 nm diameter and for comparison a flat silicon substrate. The in-situ iron evaporation took place in an ultrahigh vacuum chamber using molecular beam epitaxy technique. After the evaporation steps, time differential nuclear forward scattering spectra, grazing incidence small angle X-ray scattering images and X-ray reflectivity curves were recorded. In order to reconstruct and visualize the magnetic moment configuration in the iron cap formed on top of the silica spheres, micromagnetic simulations were performed for all iron thicknesses. We found a great influence of the template topography on the onset of the magnetism and on the developed magnetic nanostructure. We observed individual magnetic behaviour for the 400 nm spheres which was modelled by vortex formation and collective magnetic structure for the 25 nm spheres where magnetic domains spread over several particles. Depth selective nuclear forward scattering measurements showed that the formation of magnetism begins at the top region of the 400 nm spheres contrary to the 25 nm particles were the magnetism first appears in the region where the spheres are in contact with each other.

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