Heated Dot Magnetic Recording Media - Path to 10 Tdots/in<sup>2</sup>

Kuo, David; Lee, Kim Y.; Yang, XiaoMin; Xiao, Shuaigang; Hsu, Yautzong; Yu, Zhaoning; Feldbaum, Michael; Klemmer, T. J.; Kubota, Yukiko; Thiele, Jan-Ulrich; Steiner, Philip; Wago, K.; Dallorto, Stefano; Olynick, Deirdre L.

doi:10.1109/icaums.2016.8479820

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…An annealing at 600 • C transformed these FePt colloidal nanoparticles into carbon-coated L1 0 FePt-phase nanoclusters. As proposed by Seagate a few years ago [6], the heated dot magnetic recording (HDMR) is a promising technology suitable for increasing the density of media used for magnetic recording to values around 4 Tb/in 2 . It is indeed true that the heated-dot magnetic recording technology needs arrays of magnetic dots, periodically dispersed, non-interacting and well within the nanometer-size range, with stable magnetic response and high uniaxial perpendicular magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

“…While the chemical route described in [4,5] provides non-interacting, small nanoparticles, their carbonaceous coating can impede the recording processes by diminishing the magnetic response. The lithographical route proposed in [6] has the advantage of providing regular disposal of these small nanoclusters. Here, the media is made of a continuously deposited FePt film and a lithographical path is employed to provide and define regular arrays of periodically disposed magnetic dot, which are subsequently heated to achieve the L1 0 FePt phase.…”

Section: Introductionmentioning

confidence: 99%

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Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Crisan,

Schinteie

et al. 2023

Coatings

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Nano-logic magnetic structures are of great interest for spintronic applications. While the methods used for developing arrays of magnetic L10-phase dots are, in most cases, based on deposition followed by annealing at high temperatures, usually around 700 °C, we demonstrate here a technique where a much lower annealing temperature (i.e., 400 °C) is needed in order to promote fully the disorder–order phase transformation and achievement of highly coercive L10-phase dots. In order to develop building blocks based on arrays of L10-phase FePt dots for further spintronic applications, an engraving technique using electron beam lithography is employed. This paper describes the fabrication, as well as the morphological and magnetic characterization, of regularly placed FePt dots of various shapes, as pre-requisites for integration into nano-logic devices. As a proof of concept, regular arrays of FePt circular dots were devised and their structural characterization, using X-ray diffraction (XRD) and transmission electron microscopy (TEM), was performed. It has been shown that annealing at only 400 °C for 30 min proved the occurrence of the tetragonal L10 phase. Moreover, structural characterization showed that the disorder–order phase transformation was complete with only the L10 phase detected in high resolution TEM. The magnetic characterization provided more insight into the potential of such arrays of magnetic devices with convenient values of magnetic coercivity, remanent and saturation magnetization. These findings show good potential for developing regular arrays of uniformly shaped magnetic entities with encouraging magnetic performances in view of various applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Crisan,

Schinteie

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

“…An annealing at 600 • C transformed these FePt Crystals 2024, 14, 58 2 of 12 colloidal nanoparticles into carbon-coated L1 0 FePt phase nanoclusters. As proposed by Seagate a number of years ago [6], the heated dot magnetic recording (HDMR) is a promising technology suitable for increasing the density of media used for magnetic recording to values of around 4 Tb/in 2 . It is indeed true that the heating dot magnetic recording technology needs arrays of magnetic dots that are periodically dispersed, non-interacting, well within the nanometer-size range, and that have a stable magnetic response and high uniaxial perpendicular magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

“…While the chemical route described in [4,7] provides non-interacting, small nanoparticles, their carbonaceous coating can impede the recording processes due to the diminishing of the magnetic response. The lithographical route proposed in [6] has the advantage of providing regular disposal of these small nanoclusters. Here, the media is made of a continuously deposited FePt film and lithographical path is employed to provide and define regular arrays of periodically disposed magnetic dots which are subsequently heated to achieve the L1 0 FePt phase.…”

Section: Introductionmentioning

confidence: 99%

Lithographically Ordered FePt L10 Dots with High Coercivity for Logic-Conditioned Magnetic Nanostructures

Crisan,

Crisan

2023

Crystals

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In order to develop the building blocks for future biosensing and spintronic applications, an engraving technique using electron beam lithography is employed in order to develop nanomagnetic pre-patterned structures with logic potential. The paper describes the realization and morphological and magnetic characterization of potentially logic-conditioned substrates, a building block to be further used as an integration platform upon which nanodevices, such as magnetic wires, or various geometrical shapes, circles, triangles, can be considered as pre-requisite for full integration into logic devices. As a proof of concept, regular arrays of FePt circles or magnetic dots were devised and structural characterization by X-ray diffraction and transmission electron microscopy proved the occurrence of the tetragonal L10 phase. Moreover, the magnetic characterization provided more insight into the potential of such arrays of magnetic devices as the hysteresis provided good values of magnetic coercivity, remanent and saturation magnetization. These findings show good potential for developing regular arrays of uniformly shaped magnetic entities with encouraging magnetic performances in view of potential applications in various applications.

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Optimization of Layer Thicknesses for Dual-Layer Bit-Patterned Media Recording (BPMR) Systems

Rueangnetr,

Warisarn,

Greaves

2024

2024 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)

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Heated Dot Magnetic Recording Media - Path to 10 Tdots/in²

Cited by 5 publications

References 1 publication

Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Lithographically Ordered FePt L10 Dots with High Coercivity for Logic-Conditioned Magnetic Nanostructures

Optimization of Layer Thicknesses for Dual-Layer Bit-Patterned Media Recording (BPMR) Systems

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Heated Dot Magnetic Recording Media - Path to 10 Tdots/in2

Cited by 5 publications

References 1 publication

Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Highly Coercive L10-Phase Dots Obtained through Low Temperature Annealing for Nano-Logic Magnetic Structures

Lithographically Ordered FePt L10 Dots with High Coercivity for Logic-Conditioned Magnetic Nanostructures

Optimization of Layer Thicknesses for Dual-Layer Bit-Patterned Media Recording (BPMR) Systems

Contact Info

Product

Resources

About

Heated Dot Magnetic Recording Media - Path to 10 Tdots/in²