Skip to Main content Skip to Navigation
Journal articles

Ultrafast manipulation of magnetic anisotropy in a uniaxial intermetallic heterostructure TbCo 2 /FeCo

Abstract : Abstract We study experimentally and theoretically the dynamics of spin relaxation motion excited by a femtosecond pulse in the TbCo 2 /FeCo multilayer structures with different ratios of TbCo 2 to FeCo thicknesses r d = d T b C o 2 / d F e C o . The main attribute of the structure is in-plane magnetic anisotropy that is artificially induced during sputtering under a DC magnetic field. The optical pump-probe method revealed strongly damped high-frequency oscillations of the dynamical Kerr rotation angle, followed by its slow relaxation to the initial state. Modeling experimental results using the Landau–Lifshitz-Gilbert (LLG) equation showed that the observed entire dynamics is due to destruction and restoration of magnetic anisotropy rather than to demagnetization. For the pumping fluence of 7 mJ cm −2 , the maximal photo-induced disruption of the anisotropy field is about 14% for the sample with r d = 1 and decreases when r d increases. The anisotropy relaxation is a three-stage process: the ultrafast one occurs within several picoseconds, and the slow one occurs on a nanosecond time scale. The Gilbert damping in the multilayers is found to be one order of magnitude higher than that in the constituent monolayers.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03597082
Contributor : Collection IEMN Connect in order to contact the contributor
Submitted on : Friday, March 4, 2022 - 10:46:13 AM
Last modification on : Tuesday, July 19, 2022 - 11:48:22 AM
Long-term archiving on: : Sunday, June 5, 2022 - 6:43:08 PM

File

Ultrafast manipulation of magn...
Files produced by the author(s)

Identifiers

Citation

Sergei Ovcharenko, Mikhail Gaponov, Alexey Klimov, Nicolas Tiercelin, Philippe Pernod, et al.. Ultrafast manipulation of magnetic anisotropy in a uniaxial intermetallic heterostructure TbCo 2 /FeCo. Journal of Physics D: Applied Physics, IOP Publishing, 2022, 55 (17), pp.175001. ⟨10.1088/1361-6463/ac4a9a⟩. ⟨hal-03597082⟩

Share

Metrics

Record views

25

Files downloads

9