Design and recording simulation of 1Tbit/in2 patterned media

Honda, N.; Takahashi, Shogo; Ouchi, Kazuhiro

doi:10.1016/j.jmmm.2008.03.048

Cited by 14 publications

(3 citation statements)

References 17 publications

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“…The soft magnetic unit length of 25.0 nm is long enough to reduce the effective coercivity for the hard magnetic unit [3]. The hard magnetic unit length of 10.0 nm is long enough in terms of thermal stability [5]. Materials for the hard and soft magnetic units are assumed to be FePt type and Fe type materials, so the anisotropy field and the saturation magnetization for the hard magnetic unit are set to 18 kOe and 1000 emu/cc and the saturation magnetization for the soft magnetic unit is set to 1200 emu/cc.…”

Section: Simulationmentioning

confidence: 99%

Magnetization Switching Time for Hard/Soft Magnetic Composite Pillar

Matsuzaki

Tanaka

Kurisu

et al. 2009

Trans. Mat. Res. Soc. Japan

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A hard/soft magnetic composite pillar array medium(CPA media) is proposed for Tera-bits/inch 2 recording. The recording frequency of 1.5 GHz is considered to be necessary to obtain high data rate with 1 Tbits/inch 2 recording rensity. A magnetization switching time for the single hard/soft magnetic composite pillar was evaluated using a micromagnetic simulator based on the Landau-Lifshitz-Gilbert equation. The switching time less than 0.33 nano second was found to be attained by appropriately setting the damping constant, the incident angle of applied field, and the exchange constant between the hard and soft magnetic units. The influence of the neighboring pillars in the array was also evaluated. The CPA media was found to be available for the high frequency recording corresponding to 1.5 GHz.

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Section: Simulationmentioning

confidence: 99%

Magnetization Switching Time for Hard/Soft Magnetic Composite Pillar

Matsuzaki

Tanaka

Kurisu

et al. 2009

Trans. Mat. Res. Soc. Japan

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“…Nowadays, discoveries such as giant magnetoresistance (GMR) 1,2 , tunneling magnetoresistance (TMR) 3,4 and innovations like dynamic flying height (DFH) 5 or perpendicular magnetic recording (PMR) [6][7][8] made possible the continuous increase of stored information on a unit surface area. However, exceeding 1 Tbit/inch 2 storage density is not possible with the latter techniques 9 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/inch 2 14 .…”

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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“…This phenomenon is known as the superparamagnetic effect. Patterned media have been suggested as a potential solution for this physical limit [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thicknesses on the Microstructure and Magnetic Properties of CoPt Thin Films

Shen

Kuo

Lin

et al. 2010

AMR

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The microstructures and magnetic properties of CoPt thin films with thicknesses between 1 and 20 nm deposited on amorphous glass substrate and post-annealing at 600°C for 30 min were investigated. The morphology of CoPt thin film would change from a discontinuous nano-size CoPt islands into a continuous film gradually as the film thickness was increased from 1 to 20 nm. The formation mechanism of the CoPt islands may be due to the surface energy difference between the glass substrate and CoPt alloy. Each CoPt island could be a single domain particle. This discontinuous nano-island CoPt recording film may increase the recording density and enhance the signal to noise ratio while comparing with the continuous film. The as-deposited 5 nm CoPt film revealed the separated islands morphology after annealing at 600°C for 30 min. This nano-size CoPt thin film may be a candidate for ultra-high density magnetic recording media due to its discontinuous islanded nanostructure.

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Design and recording simulation of 1Tbit/in2 patterned media

Cited by 14 publications

References 17 publications

Magnetization Switching Time for Hard/Soft Magnetic Composite Pillar

Magnetization Switching Time for Hard/Soft Magnetic Composite Pillar

Evolution of magnetism on a curved nano-surface

Effect of Thicknesses on the Microstructure and Magnetic Properties of CoPt Thin Films

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