Outlook for maintaining areal density growth in magnetic recording

Grochowski, E.; Thompson, David A.

doi:10.1109/20.333908

Cited by 82 publications

(12 citation statements)

References 5 publications

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“…Progress in magnetic recording density are due in part to the development of media with finer and finer grain magnetic films. [17][18][19][20][21][22][23] The study of nanoscale magnetic domains are of both fundamental and pressing technical interest as the grain size of advanced recording media is rapidly shrinking to dimensions where magnetic properties depend strongly on NC ͑grain͒ size. At the smallest sizes the NCs become superparamagnetic.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monodisperse cobalt nanocrystals and their assembly into magnetic superlattices (invited)

Sun¹,

Murray²

1999

Journal of Applied Physics

1,014

701

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A simple method for the determination of doping type in nanomaterials based on electrical response to humidity Appl. Phys. Lett. 101, 142110 (2012) Charge transport in functionalized multi-wall carbon nanotube-Nafion composite J. Appl. Phys. 112, 053706 (2012) Tailoring plasmon resonances in the deep-ultraviolet by size-tunable fabrication of aluminum nanostructures Appl. Phys. Lett. 101, 081110 (2012) A critical evaluation of the 0-3 approach for magnetoelectric nanocomposites with metallic nanoparticles High temperature, solution phase reduction of cobalt chloride in the presence of stabilizing agents was employed to produce magnetic colloids ͑ferrofluids͒ of cobalt nanocrystals. We systematically synthesized and isolated nearly monodisperse nanocrystal samples ranging in size from 2 to 11 nm while maintaining better than a 7% std. dev. in diameter. As synthesized cobalt particles are each a single crystal with a complex cubic structure related to the beta phase of elemental manganese ͑⑀-Co͒. Annealing the nanocrystals at 300°C converts them quantitatively to the more common hexagonal-close-packed crystal form. Deposition of these uniform cobalt particles on solid substrates by evaporation of the carrier solvent results in the spontaneous assembly of two-dimensional and three-dimensional magnetic superlattices ͑colloidal crystals͒. A combination of x-ray powder diffraction, transmission electron microscopy, and superconducting quantum interference device magnetometry were used to characterize both the dispersed nanocrystals and the assembled superlattices.

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Section: Introductionmentioning

confidence: 99%

Synthesis of monodisperse cobalt nanocrystals and their assembly into magnetic superlattices (invited)

Sun¹,

Murray²

1999

Journal of Applied Physics

1,014

701

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“…[1][2][3] At present, using Co-based media, areal density of more than 10 Gb/in. 2 has been achieved in commercial hard-disk drives and several 20 Gb/in.…”

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confidence: 99%

Nanocomposite CoPt:C films for extremely high-density recording

Liu

Möser

et al. 1999

Applied Physics Letters

162

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Nanocomposite CoPt:C films were investigated as potential media for extremely high-density recording. An annealing temperature of over 600 °C is necessary to form nanocomposite CoPt:C films consisting of C matrix and fct CoPt nanocrystallites with grain sizes of 8–20 nm and coercivities of 3–12 kOe. Coercivity and grain size increase with increasing annealing temperature and decreasing C concentration and they are insensitive to film thickness. The average activation volumes are about 0.9×10−18 cm3. The properties of these nanocomposite CoPt:C films can be tailored to satisfy the thermal stability, coercivity, and media noise requirements for extremely high-density recording.

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“…These two voltage sources are in series with the same polarity, hence their voltages simply add and the sum, , is mapped proportionally to the VCR . 3 is essentially the GMR bit, any external circuitry connected to and sees the resistance of as the effective GMR resistance across the sense line terminals (between and ).…”

Section: If Ifmentioning

confidence: 99%

“…GMR materials are now being used as highly sensitive magnetic sensors [2] and are responsible for a continued revolution in disk drive performance and storage density [3]. They also show promise of economical high-density data storage in magnetic random-access memory (MRAM) devices [4].…”

Section: Introductionmentioning

confidence: 99%

Universal HSPICE macromodel for giant magnetoresistance memory bits

2000

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Nonvolatile semiconductor storage using giant magnetoresistance (GMR) memory bits has the potential for revolutionizing both high-density and high-speed memory applications with devices exhibiting unlimited write endurance and very low write energy. This paper presents the first universal circuit macromodel for GMR memory bits. The macromodel is realized as a four-terminal subcircuit that emulates GMR bit behavior over a wide range of sense and word-line currents. It realistically models the nonlinear and hysteretic behavior of GMR memory bits, their transient thermal behavior, and the sense-current dependency of their write thresholds. The model is flexible and relatively simple: Ranges of the write/read currents and bit resistance values are incorporated as parameterized variables, and no semiconductor devices are used within the model.

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Outlook for maintaining areal density growth in magnetic recording

Cited by 82 publications

References 5 publications

Synthesis of monodisperse cobalt nanocrystals and their assembly into magnetic superlattices (invited)

Synthesis of monodisperse cobalt nanocrystals and their assembly into magnetic superlattices (invited)

Nanocomposite CoPt:C films for extremely high-density recording

Universal HSPICE macromodel for giant magnetoresistance memory bits

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