Head and Granular Media for Thermally Assisted Magnetic Recording for Recording Density of 6 Tb/in$^{2}$

Akagi, Fumiko; Ushiyama, Junko; Ando, Ayano; Miyamoto, Hiroyuki

doi:10.1109/tmag.2012.2237018

Cited by 4 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where A(T) is an approximation equation obtained from the exchange stiffness constants when MH loops calculated by Landau-Lifshitz-Gilbert simulation were fitted in the experiments. 9) The Curie temperature was 600 K. The H k decreased to about 820 from 4000 kA m −1 (298 at 548 K (298 K + 250 K). The head fields were calculated via FEM.…”

Section: mentioning

confidence: 92%

Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording

Akagi

Matsushima

2022

Jpn. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

In this study, we investigated the relationship between the temperature rise in the recording dots of a bit-patterned medium and its thermal conductivity during heated dot magnetic recording (HDMR) using numerical calculation (electromagnetic field and heat conduction analyses). When the thermal conductivities of the recording and heat sink layers were anisotropic, the temperature rise of a dot’s lower cell could be increased while maintaining a small temperature difference between the upper and lower cells. The HDMR process was calculated via micromagnetic simulation using the Landau–Lifshitz–Bloch equation at vertical and in-plane thermal conductivities of 24.0 and 1.0 W/mK (12.0 and 10.0 W/mK), respectively, for the recording (heat sink) layer. Results showed a bit error rate of 0%, and there was no error.

show abstract

Section: mentioning

confidence: 92%

Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording

Akagi

Matsushima

2022

Jpn. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…To improve the medium's thermal performance and the thermal diffusion, the introduction of a heat sink layer, typically Au, but also Cr, Al or Cu [13], between the seed layer and the glass substrate is recommended.…”

Section: Recording Media For Hamrmentioning

confidence: 99%

Materials and Processes in Heat Assisted Magnetic Recording

Gavrilǎ

Gavrilă

2014

AMR

View full text Add to dashboard Cite

The conventional magnetic recording has approached its physical limits. Further growth of the areal density is limited by the superparamagnetic effect and by the limited possibilities to further improve write heads design and pole materials in order to enhance the writing field. A new technology proposed to surpass these limits is theheat assisted magnetic recording(HAMR). The principle of HAMR and the structure of a HAMR system are discussed, as well as the processes characterizing the writing process and the requirements for the materials needed for this type of recording. Some important challenges of the HAMR technology are summarized.

show abstract

Achievement and expected issues in heat assisted magnetic recording

Gavrilǎ¹

2017

JESI

View full text Add to dashboard Cite

The main goals in magnetic recording are the continuous increase of the areal recording density and the highest possible signal-to-noise ratio (SNR). The conventional magnetic recording has approached its physical limits. Further growth of the areal density is limited by the superparamagnetic effect and by the limited possibilities to further improve write heads design and pole materials in order to enhance the writing field. The perpendicular magnetic recording (PMR) with pole head and perpendicular media is the best alternative, especially to defer the superparamagnetic limit. PMR is also better situated to face the challenging design trilemma of magnetic recording: To increase the areal recording density, smaller grain volumes are needed, but to ensure the thermal stability of recorded information, the anisotropy should be increased accordingly; or, the increased anisotropy asks for higher writing fields, which are unavailable with the saturation magnetization of the magnetic materials of the current heads. Obviously, an alternative technology is needed to overcome the physical limit of conventional perpendicular recording (CPR). The most promising successor of CPR is the heat–assisted magnetic recording (HAMR), which is a multidisciplinary technology, a combination of magnetic and optical recording technology that proved experimentally areal densities of more than 1 Tb/in2 . HAMR allows the use of very smallgrain media, required for recording at ultra-high densities, with a larger magnetic anisotropy at room temperature, thus assuring a good thermal stability, while the local heating leads to a temporary magnetic softening of the medium. The realization of HAMR involved some challenges from both optical design and media properties. In the optical design the use of near-field transducers (NFT) represents an important advance. Regarding the media, a thermal design was used to produce the heating and cooling of the media within a very short time, about 1 ns, in order to achieve the desired data rate and generate a large thermal gradient for sharp bit edge definition. The structure of a HAMR system is briefly discussed, as well as the processes characterizing the writing process. A special attention is paid to the requirements for the materials needed for this type of recording: the granular L10-ordered FePt:X alloy sputtered on glass disk, the FePt-C and FePtC-Ag granular films and the bitpatterned media. Some important challenges of the HAMR technology are also summarized.

show abstract

Head and Granular Media for Thermally Assisted Magnetic Recording for Recording Density of 6 Tb/in$^{2}$

Cited by 4 publications

References 4 publications

Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording

Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording

Materials and Processes in Heat Assisted Magnetic Recording

Achievement and expected issues in heat assisted magnetic recording

Contact Info

Product

Resources

About