Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films

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6 Citations (Scopus)

Abstract

Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.

Original languageEnglish
Article number140406
JournalPhysical Review B
Volume100
Issue number14
DOIs
Publication statusPublished - 2019 Oct 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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