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Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets

Liu, H. (author)
Univ S Florida, Dept Phys, Tampa, FL 33620 USA.
Knut, Ronny (author)
Uppsala universitet,Energimaterialens fysik
Saha, Susmita (author)
Uppsala universitet,Energimaterialens fysik
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Malik, Rameez Saeed, 1987- (author)
Uppsala universitet,Energimaterialens fysik
Jatkar, Kasturie (author)
Uppsala universitet,Institutionen för fysik och astronomi
Stefanuik, Robert (author)
Uppsala universitet,Kemisk och biomolekylär fysik
Söderström, Johan, 1978- (author)
Uppsala universitet,Kemisk och biomolekylär fysik
Shoup, J. E. (author)
Univ S Florida, Dept Phys, Tampa, FL 33620 USA.
Khadka, Durga (author)
Univ Miami, Dept Phys, Coral Gables, FL 33124 USA.
Thapaliya, T. R. (author)
Univ Miami, Dept Phys, Coral Gables, FL 33124 USA.
Huang, S. X. (author)
Univ Miami, Dept Phys, Coral Gables, FL 33124 USA.
Gupta, A. (author)
Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA.
Karis, Olof (author)
Uppsala universitet,Energimaterialens fysik
Karaiskaj, D. (author)
Univ S Florida, Dept Phys, Tampa, FL 33620 USA.
Arena, D. A. (author)
Univ S Florida, Dept Phys, Tampa, FL 33620 USA.
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Univ S Florida, Dept Phys, Tampa, FL 33620 USA Energimaterialens fysik (creator_code:org_t)
American Institute of Physics (AIP), 2021
2021
English.
In: Journal of Applied Physics. - : American Institute of Physics (AIP). - 0021-8979 .- 1089-7550. ; 130:24
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We present all-optical studies of spin dynamics in two classes of ferrimagnets. Both sets of experiments use table-top laser-based pump–probe techniques to examine the ultrafast and longer timescale spin excitations. We use the visible/near infra-red time-resolved magneto-optical Kerr effect (tr-MOKE) to follow the spin dynamics of a series of metallic (FeCo)1−xGdx thin films with varying Gd content. Magnetic compensation in the films occurs at a Gd concentration of ≈26%, and the spin dynamics of the films exhibit a non-monotonic variation in effective magnetization. We also examine spin dynamics in an insulating NiFe2O4 spinel using ultrafast techniques up at extreme ultraviolet energies, which permit element-specific investigations. The element and time-resolved delay scans reveal a non-trivial interaction between spin excitations on the different magnetic sub-lattices of the magnetic insulator.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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