Nanostructured magnetic films for extremely high density recording

Sellmyer, David J.; Yu, M.; Kirby, Roger D.

doi:10.1016/s0965-9773(99)00291-3

Cited by 109 publications

(60 citation statements)

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“…1 Such a high magnetic recording density requires media to have high coercivity and a grain size of less than 10 nm. 2 With such small grain size, the particle magnetization becomes thermal instability. In order to overcome the thermal instability and continue the growth of the areal density, recent studies have been focused on high anisotropy, L1 0 phased FePt and CoPt alloy thin films.…”

Section: Introductionmentioning

confidence: 99%

Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

Shao

Yan

Sellmyer

2003

Journal of Applied Physics

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We report effects of rapid thermal annealing on nanostructure, texture, and magnetic properties of granular FePt:Ag films. It was found that the orientations of FePt grains were dependent strongly on the as-deposited multilayer structure and the annealing processes. Through the control of the annealing processes, ͑001͒ textured L1 0 granular FePt:Ag films were obtained. Magnetic measurements revealed that saturation magnetization M s , perpendicular coercivity H c , and remanence ratio M r /M s , were also dependent on the annealing temperature, annealing time and Ag content. Perpendicular H c values increased from 1.5 to 15 kOe when the annealing temperature changed from 400 to 600°C for 600 s. Perpendicular H c values remained about 11 kOe when the annealing time changed from 5 to 600 s. The effect of Ag content on magnetic properties is reported.

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Section: Introductionmentioning

confidence: 99%

Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

Shao

Yan

Sellmyer

2003

Journal of Applied Physics

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“…13,14 This idea is supported by the fact that media noise for Co-based films is proportional to M s V*. 15 It can be shown that 6,16 …”

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confidence: 96%

“…5͒ and weakly exchange-coupled grains of less than 10 nm in size according to very simple estimates. 6 For grain size dϷ10 nm (VϷd 3 ϭ1ϫ10 Ϫ18 cm 3 ), the issue of thermal stability has to be considered. The magnetization of a grain decays due to thermal fluctuations.…”

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confidence: 99%

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Nanocomposite CoPt:C films for extremely high-density recording

Liu

Möser

et al. 1999

Applied Physics Letters

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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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confidence: 99%

Temperature-dependent rigidity and magnetism of polyamide 6 nanocomposites based on nanocrystalline Fe-Ni alloy of various geometries

Mohamed¹,

Pedrazzoli²,

Nady³

et al. 2016

Express Polym. Lett.

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Magnetic nanomaterials are essential components of modern technology in a wide range of applications, including catalysis [1], sensors [2], data storage [3], biotechnology/biomedicine [4], magnetic resonance imaging [5], environmental remediation [6], spintronic [7] and microwave devices [8,9]. Nanoscale magnetic materials are so attractive because they show remarkable novel phenomena compared to their bulk counterparts, such as superparamagnetism, ultrahigh magnetic anisotropy and coercive force, and giant magnetoresistance. These phenomena arise from finite size and surface effects that dominate the magnetic behavior of individual nanoparticles [10,11] Abstract. The focus of this study is to explore the potential use of Polyamide 6 nanocomposite reinforced with nanocrystalline (nc) Fe 20 Ni 80 alloy (Fe 20 Ni 80 /PA6 PNC) in electromagnetic applications and provide understanding of how the alloy particle geometry is controlling the nanocomposite's physical properties. Thermomechanical rigidity, room-temperature soft magnetic performance and thermal soft magnetic stability of Fe 20 Ni 80 /PA6 PNCs based on spherical-sea urchin alloy particles (UMB2-SU) and necklace-like alloy chains (UMB2-NC) have been investigated. Both PNCs have considerably superior bulk properties compared to neat PA6 and UMB2-SU exhibits the most remarkable overall performance. Morphological observations disclose two relevant phenomena: i) improved dispersion and distribution of the SU alloy particles than the NC ones within PA6 matrix, leading to stronger filler-matrix interfacial interactions within the UMB2-SU as compared to the UMB2-NC and ii) presence of constraint polymer regions in between alloy segments within the UMB2-SU that provide secondary reinforcing and soft magnetic mechanisms. Such phenomena along with the lower alloy crystallite size and PA6 γ-crystal type content within the UMB2-SU than in the UMB2-NC, are considered the main responsible factors for the distinctive performance of UMB2-SU. Overall, compared to various ferromagnetic nanocrystalline metallic materials, the research proposes the SU nc Fe 20 Ni 80 alloy as a valuable nanofiller in polymers for electromagnetic applications.

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Nanostructured magnetic films for extremely high density recording

Cited by 109 publications

References 5 publications

Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

Nanocomposite CoPt:C films for extremely high-density recording

Temperature-dependent rigidity and magnetism of polyamide 6 nanocomposites based on nanocrystalline Fe-Ni alloy of various geometries

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