Origin of focused laser irradiation-induced enhancement of perpendicular magnetic anisotropy in Pt/Co/Pt thin films investigated by spatially resolved x-ray absorption spectroscopy

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  • K. Amemiya
    Institute of Materials Structure Science, High Energy Accelerator Research Organization 1 , Tsukuba, Ibaraki 305-0801, Japan
  • M. Sakamaki
    Institute of Materials Structure Science, High Energy Accelerator Research Organization 1 , Tsukuba, Ibaraki 305-0801, Japan
  • J. Kisielewski
    Faculty of Physics, University of Białystok 3 , Ciołkowskiego 1L, 15-245 Białystok, Poland
  • Z. Kurant
    Faculty of Physics, University of Białystok 3 , Ciołkowskiego 1L, 15-245 Białystok, Poland
  • I. Sveklo
    Faculty of Physics, University of Białystok 3 , Ciołkowskiego 1L, 15-245 Białystok, Poland
  • M. Tekielak
    Faculty of Physics, University of Białystok 3 , Ciołkowskiego 1L, 15-245 Białystok, Poland
  • A. Wawro
    Institute of Physics, Polish Academy of Sciences 4 , Aleja Lotników 32/46, 02-668 Warsaw, Poland
  • A. Maziewski
    Faculty of Physics, University of Białystok 3 , Ciołkowskiego 1L, 15-245 Białystok, Poland

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<jats:p>The origin of the focused single-pulse laser irradiation-induced changes in magnetic anisotropy of a Pt/Co/Pt film is investigated by the x-ray absorption near-edge structure and extended x-ray absorption fine structure techniques combined with the photoelectron emission microscope. A significant increase of the Co–Co bond length in both in-plane and out-of-plane directions is observed on the periphery of the laser spot, at which perpendicular magnetization appears. With increasing laser power density towards the center of the laser spot, anisotropic structural changes are observed accompanied by the reappearance of in-plane magnetization. The enhancement of perpendicular magnetization is attributed to the lattice expansion-induced magnetoelastic effect, while the in-plane compressive strain in the Co film is suggested to be the origin of the reappearance of in-plane magnetization at higher laser power densities.</jats:p>

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