Jump to main content
Jump to site search

Issue 83, 2016
Previous Article Next Article

All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

Author affiliations

Abstract

We investigate optically induced ultrafast magnetization dynamics in [Co(0.5 nm)/Pd(1 nm)]5/NiFe(t) exchange-spring samples with tilted perpendicular magnetic anisotropy using a time-resolved magneto-optical Kerr effect magnetometer. The competition between the out-of-plane anisotropy of the hard layer, the in-plane anisotropy of the soft layer and the applied bias field reorganizes the spins in the soft layer, which are modified further with the variation in t. The spin-wave spectrum, the ultrafast demagnetization time, and the extracted damping coefficients – all depend on the spin distribution in the soft layer, while the latter two also depend on the spin–orbit coupling between the Co and Pd layers. The spin-wave spectra change from multimode to single-mode as t decreases. At the maximum field reached in this study, H = 2.5 kOe, the damping shows a nonmonotonic dependence on t with a minimum at t = 7.5 nm. For t < 7.5 nm, intrinsic effects dominate, whereas for t > 7.5 nm, extrinsic effects govern the damping mechanisms.

Graphical abstract: All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

Back to tab navigation

Publication details

The article was received on 11 May 2016, accepted on 15 Aug 2016 and first published on 23 Aug 2016


Article type: Paper
DOI: 10.1039/C6RA12227B
Citation: RSC Adv., 2016,6, 80168-80173
  •   Request permissions

    All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

    C. Banerjee, S. Pal, M. Ahlberg, T. N. A. Nguyen, J. Åkerman and A. Barman, RSC Adv., 2016, 6, 80168
    DOI: 10.1039/C6RA12227B

Search articles by author

Spotlight

Advertisements