Orientation-controlled nonepitaxial L1 CoPt and FePt films

Zeng, Hao; Yan, Ming; Powers, Nathan; Sellmyer, David J.

doi:10.1063/1.1464663

Cited by 199 publications

(98 citation statements)

References 14 publications

(15 reference statements)

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“…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. [3][4][5] Usually, a heated substrate or a post-thermal annealing is needed for obtaining the ordered structure. However, one of the side effects of annealing is relatively high processing temperature, which may adversely affect grain growth.…”

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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“…4 -6 The fabrication conditions, annealing processes, and magnetic properties of these ͑001͒ textured films also have been investigated systematically. [5][6][7][8][9] For practical applications, nonepitaxially grown L1 0 nanocomposite FePtbased thin films are advantageous because of the ease of growth. In this letter, we report the design and fabrication of nonepitaxially grown ͑001͒ textured L1 0 nanocomposite FePt:C thin films with a soft-magnetic underlayer ͑SUL͒.…”

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confidence: 99%

“…The details regarding the attainment of these preferential ͑001͒ oriented FePt-based composite films and their perpendicular magnetic properties have been reported and discussed in our previous papers. 5,7 In order to study exchange coupling between magnetic grains, the correlation length of this sample was analyzed by MFM. Figure 3 shows the MFM image for an 11 nm thick FePt:C film in the thermally demagnetized states.…”

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confidence: 99%

Fabrication of nonepitaxially grown double-layered FePt:C/FeCoNi thin films for perpendicular recording

Yan

Gao

et al. 2003

Applied Physics Letters

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A noneptaxially grown double-layered thin-film medium of nanocompsite FePt:C with a FeCoNi soft underlayer for high-density perpendicular magnetic recording was fabricated and investigated. Square-shaped perpendicular loops with a remanance ratio nearly equal to one and a coercivity as large as 8.5 kOe were obtained for this ordered FePt:C double-layered medium. The formation of the ordered L10 phase is confirmed by electron diffraction experiments. Transmission electron microscope observations reveal that FePt grains with a uniform size less than 5 nm are embedded in the C matrix and appear to be well isolated. Our results show that nonepitaxially grown (001) textured double-layered nanocomposite L10 FePt-based films with perpendicular anisotropy are a promising candidate to realize extremely high-density perpendicular recording.

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“…The as-deposited multilayers become nanocomposite films with L1 0 -phase FePt grains embedded in a non-magnetic matrix. The orientation of the c axis of the L1 0 -phase nanoparticles is strongly dependent on initial multilayering of Fe/Pt as well as dimensions of the Fe, Pt, and X individual layers [2,6,7]. Figure 5 shows the effect of Ag concentration on the orientation of L1 0 FePt:Ag nanocomposite films [7].…”

Section: I612mentioning

confidence: 99%

Nanomagnetic Structures: Fabrication and Interactions

Sellmyer

Sui

et al. 2004

MRS Proc.

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Magnetic nanostructures with desirable properties such as monodispersed size and crystallographic texturing can be fabricated by a number of synthetic techniques. In this paper, we discuss methods for creating nanoclusters with fine control of individual propertiesand their interactions, as well as a promising chemical technique that provides control of several properties simultaneously. Current and potential applications also will be addressed.

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Orientation-controlled nonepitaxial L1 CoPt and FePt films

Cited by 199 publications

References 14 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)

Fabrication of nonepitaxially grown double-layered FePt:C/FeCoNi thin films for perpendicular recording

Nanomagnetic Structures: Fabrication and Interactions

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