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 language | English |
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Article number | 140406 |
Journal | Physical Review B |
Volume | 100 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2019 Oct 11 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics