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Enhanced optical mode coherence in exchange coupled soft magnetic multilayers

https://doi.org/10.1063/5.0093827

Liu, H. ; Ciuciulkaite, Agne ; Kapaklis, Vassilios ; Karaiskaj, D. ; Arena, D. A. ( June 2022 , Journal of Applied Physics)

We report on an all-optical investigation of coupled spin excitation modes in a series of magnetic trilayer structures. Using time-resolved magneto-optic Kerr effect (tr-MOKE) magnetometry, we observe multi-mode coherent spin excitations in [Formula: see text]/Ru/[Formula: see text] multilayers even though the tr-MOKE optical detection is sensitive only to the [Formula: see text] magnetization dynamics. Frequency shifts of the different modes indicate that the coupling between the [Formula: see text] and [Formula: see text] layers varies from anti-ferromagnetic to ferromagnetic to uncoupled as the Ru spacer layer thickness is increased from 8 Å to 200 Å. The lifetime of the high frequency coherent oscillations in the [Formula: see text] layer increases by over 200%–300% even in the case of uncoupled [Formula: see text] and [Formula: see text] layers with a 200 Å thick Ru spacer. The results suggest an additional method to decrease the damping of high-moment alloys in layered magnetic nanostructures.
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Superradiant coupling effects in transition-metal dichalcogenides

https://doi.org/10.1364/OPTICA.5.000749

Stevens, C. E. ; Stroucken, T. ; Stier, A. V. ; Paul, J. ; Zhang, H. ; Dey, P. ; Crooker, S. A. ; Koch, S. W. ; Karaiskaj, D. ( June 2018 , Optica)
Multidimensional spectroscopy of magneto-excitons at high magnetic fields

https://doi.org/10.1063/5.0070113

Mapara, V. ; Stevens, C. E. ; Paul, J. ; Barua, A. ; Reno, J. L. ; McGill, S. A. ; Hilton, D. J. ; Karaiskaj, D. ( November 2021 , The Journal of Chemical Physics)
Coulomb-interaction induced coupling of Landau levels in intrinsic and modulation-doped quantum wells

https://doi.org/10.1103/PhysRevB.95.245314

Paul, J. ; Stevens, C. E. ; Zhang, H. ; Dey, P. ; McGinty, D. ; McGill, S. A. ; Smith, R. P. ; Reno, J. L. ; Turkowski, V. ; Perakis, I. E. ; et al ( June 2017 , Physical Review B)
Strong Quantum Coherence between Fermi Liquid Mahan Excitons

https://doi.org/10.1103/PhysRevLett.116.157401

Paul, J. ; Stevens, C. E. ; Liu, C. ; Dey, P. ; McIntyre, C. ; Turkowski, V. ; Reno, J. L. ; Hilton, D. J. ; Karaiskaj, D. ( April 2016 , Physical Review Letters)
Optical Coherence in Atomic-Monolayer Transition-Metal Dichalcogenides Limited by Electron-Phonon Interactions

https://doi.org/10.1103/PhysRevLett.116.127402

Dey, P. ; Paul, J. ; Wang, Z. ; Stevens, C. E. ; Liu, C. ; Romero, A. H. ; Shan, J. ; Hilton, D. J. ; Karaiskaj, D. ( March 2016 , Physical Review Letters)
Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets

https://doi.org/10.1063/5.0073606

Liu, H. ; Knut, R. ; Saha, S. ; Malik, R. S. ; Jatkar, K. ; Stefanuik, R. ; Söderström, J. ; Shoup, J. E. ; Khadka, Durga ; Thapaliya, T. R. ; et al ( December 2021 , Journal of Applied Physics)