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A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films.

ABSTRACT: An appropriate writing field is very important for magnetic storage application of L1? FePt nanocomposite thin films. However, the applications of pure L1? FePt are limited due to its large coercivity. In this paper, the ratios of L1? and non-L1? phase FePt alloy nanoparticles in FePt/MgO (100) nanocomposite thin films were successfully tuned by pulsed laser deposition method. By adjusting the pulsed laser energy density from 3 to 7 J/cm², the ordering parameter initially increased, and then decreased. The highest ordering parameter of 0.9 was obtained at the pulsed laser energy density of 5 J/cm². At this maximum value, the sample had the least amount of the soft magnetic phase of almost 0%, as analyzed by a magnetic susceptibility study. The saturation magnetization decreased with the increase in the content of soft magnetic phase. Therefore, the magnetic properties of FePt nanocomposite thin films can be controlled, which would be beneficial for the magnetic applications of these thin films.

SUBMITTER: Yu J

PROVIDER: S-EPMC6359714 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films.

Yu Jian J Xiao Tingting T Wang Xuemin X Zhou Xiuwen X Wang Xinming X Peng Liping L Zhao Yan Y Wang Jin J Chen Jie J Yin Hongbu H Wu Weidong W

Nanomaterials (Basel, Switzerland) 20190103 1

An appropriate writing field is very important for magnetic storage application of L1₀ FePt nanocomposite thin films. However, the applications of pure L1₀ FePt are limited due to its large coercivity. In this paper, the ratios of L1₀ and non-L1₀ phase FePt alloy nanoparticles in FePt/MgO (100) nanocomposite thin films were successfully tuned by pulsed laser deposition method. By adjusting the pulsed laser energy density from 3 to 7 J/cm², the ordering parameter initially increased, and then dec ...[more]

PMID: 30609793

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Project description:Fenestration elements that enable spectrally selective dynamic modulation of the near-infrared region of the electromagnetic spectrum are of great interest as a means of decreasing the energy consumption of buildings by adjusting solar heat gain in response to external temperature. The binary vanadium oxide VO2 exhibits a near-room-temperature insulator-metal electronic transition accompanied by a dramatic modulation of the near-infrared transmittance. The low-temperature insulating phase is infrared transparent but blocks infrared transmission upon metallization. There is considerable interest in harnessing the thermochromic modulation afforded by VO2 in nanocomposite thin films. However, to prepare a viable thermochromic film, the visible-light transmittance must be maintained as high as possible while maximizing thermochromic modulation in the near-infrared region of the electromagnetic spectrum, which necessitates the development of high-crystalline-quality VO2 nanocrystals of the optimal particle size embedded within the appropriate host matrix and refractive index matched to the host medium. Here, we demonstrate the preparation of acrylate-based nanocomposite thin films with varying sizes of embedded VO2 nanoparticles. The observed strong size dependence of visible-light transmittance and near-infrared modulation is explicable on the basis of optical simulations. In this article, we elucidate multiple scattering and absorption mechanisms, including Mie scattering, temperature-/phase-variant refractive-index mismatch between VO2 nanocrystals and the encapsulating matrix, and the appearance of a surface plasmon resonance using temperature-variant absorptance and diffuse transmittance spectroscopy measurements performed as a function of particle loading for the different sizes of VO2 nanocrystals. Nanocrystals with dimensions of 44 ± 30 nm show up to >32% near-infrared energy modulation across the near-infrared region of the electromagnetic spectrum while maintaining high visible-light transmission. The results presented here, providing mechanistic elucidation of the size dependence of the different scattering mechanisms, underscore the importance of nanocrystallite dimensions, refractive-index matching, and individualized dispersion of particles within the host matrix for the preparation of viable thermochromic thin films mitigating Mie scattering and differential refractive-index scattering.

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A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films.

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A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films.

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