Journal
SPIN
Volume 7, Issue 1, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S2010324717400033
Keywords
Ultrafast spin dynamics; heat sink layer; TbFeCo films; TRMOKE
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Funding
- National Natural Science Foundation of China [51201081, 61366002, 61664009, 11674142, 61465015]
- Research Funds for the Central Universities [lzujbky-2016-124]
- Research Funds for East-land young teachers training program of Yunnan University
- High-end Scientific and Technological Talents Introduction Project of Yunnan Province [2013HA019]
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The ultrafast demagnetization processes (UDP) in Ta (t nm)/TbFeCo (20 nm) films have been studied using the time-resolved magneto-optical Kerr effect (TRMOKE). With a fixed pump fluence of 2 mJ/cm(2), for the sample without a Ta underlayer (t=0nm), we observed the UDP showing a two-step decay behavior, with a relatively longer decay time (T-2) around 3.0 ps in the second step due to the equilibrium of spin-lattice relaxation following the 4f occupation. As a 10nm Ta layer is deposited, the two-step demagnetization still exists while T-2 decreases to similar to 1.9ps. Nevertheless, the second-step decay (T-2=0ps) disappears as the Ta layer thickness is increased up to 20 nm, only the first-step UDP occurs within 500 fs, followed by a fast recovery process. The rapid magnetization recovery rate strongly depends on the pump fluence. We infer that the Ta layer provides conduction electrons involving the thermal equilibrium of spin-lattice interaction and serves as heat bath taking away energy from spins of TbFeCo alloy film in UDP.
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