J. Mater. Sci. Technol. ›› 2022, Vol. 106: 28-32.DOI: 10.1016/j.jmst.2021.07.034

• Research Article • Previous Articles     Next Articles

Large-scale area of magnetically anisotropic nanoparticle monolayer films deposited by MAPLE

Lei Zhanga,c, Feng Xue, Jian Zhanga, Baoru Biana,*(), Yong Hud,*(), Fei Xuee, Juan Dub,*()   

  1. aKey Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
    bInstitute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
    cUniversity of Chinese Academy of Sciences, Beijing 100049, China
    dCollege of Sciences, Northeastern University, Shenyang 110819, China
    eAnhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China

Abstract:

Magnetically anisotropic nanoparticle monolayer films are of great interest for the development of applications such as high-density data storage, sensors. However, the formation of large-scale magnetically anisotropic monolayer film is a challenging task. Here, we provide a new way to fabricate large-scale area of Fe3O4 nanoparticle monolayer films by vacuum deposition technique (matrix-assisted pulsed laser evaporation, MAPLE). During the deposition process, only interactions between nanoparticles influence nanoparticle self-assembly behaviors. A strong magnetic anisotropy, characterized by in-plane and out-of-plane coercivity and saturation field obtained by DCM (dynamic cantilever magnetometry), was obtained both in cubic and spherical Fe3O4 nanoparticle monolayer films. The inter-particle dipolar interaction but not crystal anisotropy is responsible for this effective magnetic anisotropy, which has been proved by Monte-Carlo simulations.

Key words: Nanoparticle monolayer film, Magnetic anisotropy, MAPLE, Dynamic cantilever magnetometry, Monte-Carlo simulation, Dipolar interaction