Simulation of magnetic footprints for heat assisted magnetic recording

Pituso, Kotchakorn; Khunkitti, Pirat; Kruesubthaworn, Anan; Chooruang, Komkrit; Tongsomporn, Damrongsak; Kaewrawang, Arkom

doi:10.1051/epjap/2017170060

Cited by 3 publications

(6 citation statements)

References 20 publications

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“…The magnetic recording simulation process of HAMR technology used the correlation between the temperature and the properties of the magnetic materials to create the hotspot area. Therefore, the hotspot area model used the Brillouin function equation, as shown in Equations (2)–(4) [ 13 , 14 ]:

and

where

where J is the total angular momentum quantum number, n is a medium film series factor, T is the temperature, T C is the Curie temperature, H k is the anisotropy field, and K u is the magnetocrystalline anisotropy constant.…”

Section: Methodsmentioning

confidence: 99%

“…The L 1 0 -FePt medium is currently selected as a candidate because of the suitability of the magnetic properties [ 4 , 5 , 6 , 7 , 8 ]. The high K u , the high saturation magnetization, M s , and the low curie temperature, T c , are the magnetic properties of L 1 0 -FePt that have been optimized for the new technology of hard disks, such as MAMR [ 9 ] and HAMR [ 4 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Many publications have simulated magnetic recording to achieve high areal density and high performance. The transition jitter has been used to indicate the performance of the magnetic recording process [ 12 , 13 , 14 , 15 , 22 ]. Valcu and Yeh [ 22 ] have improved Voronoi-pattern media for very close to the microtrack model prediction.…”

Section: Introductionmentioning

confidence: 99%

“…One of the simulations showed that the grain pitch has a greater effect on the transition jitter than on the read width. Pituso et al [ 13 , 14 ] have simulated the magnetic recording process in a two-dimensional (2-D) format. The simulation demonstrates magnetic footprints of HAMR technology where heating is based on the relationship of magnetic properties with temperature.…”

Section: Introductionmentioning

confidence: 99%

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Micromagnetic Simulation of L10-FePt-Based Transition Jitter of Heat-Assisted Magnetic Recording at Ultrahigh Areal Density

Jongjaihan

Kaewrawang

2022

Micromachines

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The areal density of hard disk drives increases every year. Increasing the areal density has limitations. Therefore, heat-assisted magnetic recording (HAMR) technology has been the candidate for increasing the areal density. At ultrahigh areal density, the main problem of the magnetic recording process is noise. Transition jitter is noise that affects the read-back signal. Hence, the performance of the magnetic recording process depends on the transition jitter. In this paper, the transition jitter of L10-FePt-based HAMR technology was simulated at the ultrahigh areal density. The micromagnetic simulation was used in the magnetic recording process. The average grain size was 5.1 nm, and the standard deviation was 0.08 nm. The recording simulation format was five tracks in a medium. It was found that a bit length of 9 nm with a track width of 16.5 nm at the areal density of 4.1 Tb/in2 had the lowest transition jitter average of 1.547 nm. In addition, the transition jitter average decreased when increasing the areal density from 4.1 to 8.9 Tb/in2. It was found that the lowest transition jitter average was 1.270 nm at an 8 nm track width and a 9 nm bit length, which achieved an ultrahigh areal density of 8.9 Tb/in2.

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and

where

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Micromagnetic Simulation of L10-FePt-Based Transition Jitter of Heat-Assisted Magnetic Recording at Ultrahigh Areal Density

Jongjaihan

Kaewrawang

2022

Micromachines

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“…Recently, the capacity of hard disk drives has been heading towards a stalemate since the thermal stability of the conventional media has reached its limitation [ 1 , 2 , 3 , 4 , 5 , 6 ]. In order to increase recording densities, several techniques have been proposed to overcome the stability limitation, such as exchange-coupled-composite (ECC) media, heat-assisted magnetic recording (HAMR) bit-patterned media (BPM), and microwave-assisted magnetic recording (MAMR) [ 1 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The ECC media have been introduced to improve the magnetic properties of the media; the major goal is to reduce the magnitude of the switching field, H sw [ 7 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic Simulation of L10-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density

Khunkitti

Wannawong²,

Jongjaihan

et al. 2021

Micromachines

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In this work, we propose exchange-coupled-composite-bit-patterned media (ECC-BPM) with microwave-assisted magnetic recording (MAMR) to improve the writability of the magnetic media at a 4 Tb/in2 recording density. The suitable values of the applied microwave field’s frequency and the exchange coupling between magnetic dots, Adot, of the proposed media were evaluated. It was found that the magnitude of the switching field, Hsw, of the bilayer ECC-BPM is significantly lower than that of a conventional BPM. Additionally, using the MAMR enables further reduction of Hsw of the ECC-BPM. The suitable frequency of the applied microwave field for the proposed media is 5 GHz. The dependence of Adot on the Hsw was additionally examined, showing that the Adot of 0.14 pJ/m is the most suitable value for the proposed bilayer ECC-BPM. The physical explanation of the Hsw of the media under a variation of MAMR and Adot was given. Hysteresis loops and the magnetic domain of the media were characterized to provide further details on the results. The lowest Hsw found in our proposed media is 12.2 kOe, achieved by the bilayer ECC-BPM with an Adot of 0.14 pJ/m using a 5 GHz MAMR.

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The Effects of the Grain Sizes and the Heat Spot Geometry on the Transition Jitter in HAMR Technology

Donchai,

Otasai,

Jongjaihan

et al. 2024

2024 21st International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolo

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Simulation of magnetic footprints for heat assisted magnetic recording

Cited by 3 publications

References 20 publications

Micromagnetic Simulation of L10-FePt-Based Transition Jitter of Heat-Assisted Magnetic Recording at Ultrahigh Areal Density

Micromagnetic Simulation of L10-FePt-Based Transition Jitter of Heat-Assisted Magnetic Recording at Ultrahigh Areal Density

Micromagnetic Simulation of L10-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density

The Effects of the Grain Sizes and the Heat Spot Geometry on the Transition Jitter in HAMR Technology

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