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000893891 1001_ $$0P:(DE-Juel1)174477$$aWang, Fangzhou$$b0$$eCorresponding author$$ufzj
000893891 245__ $$aMagnetization relaxation dynamics in [ Co / Pt ] 3 multilayers on pico- and nanosecond timescales
000893891 260__ $$aCollege Park, MD$$bAPS$$c2021
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000893891 520__ $$aWe experimentally investigated magnetization relaxation dynamics in the largely unexplored time window extending from few picoseconds up to two nanoseconds following femtosecond laser pulse excitation. We triggered magnetization dynamics in [Co(0.4nm)/Pt(0.7nm)]3 multilayers and measured the resulting magneto-optic response by recording both transient hysteresis loops as well as transients of magnetization dynamics. We observe that the coercive field of the sample is still strongly suppressed even ∼1 ms after the laser excitation, which is three orders of magnitude longer than the recovery time of the magnetization amplitude. In addition, we succeeded to fit the magnetization relaxation data in the entire experimentally observed time window by considering two phenomenological time constants τ∗f and τ∗s describing fast (ps) and slow (ns) magnetization relaxation processes, respectively. The fits of the data suggest a magnetic field dependent relaxation slowdown beyond 100 ps after excitation. We observe an explosion of the τ∗f and τ∗s values when the magnetization is completely quenched and relaxes intrinsically in the absence of an external magnetic field. We interpret the phenomenological time constants τ∗f and τ∗s using an intuitive physical picture based on the Landau-Lifshitz-Bloch model and numerical solutions of the extended three-temperature model [Shim et al., Sci. Rep. 10, 6355 (2020)].
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000893891 7001_ $$0P:(DE-Juel1)130582$$aBürgler, Daniel E.$$b1
000893891 7001_ $$0P:(DE-Juel1)130495$$aAdam, Roman$$b2$$ufzj
000893891 7001_ $$0P:(DE-Juel1)165684$$aParlak, Umut$$b3
000893891 7001_ $$0P:(DE-Juel1)177876$$aCao, Derang$$b4$$ufzj
000893891 7001_ $$0P:(DE-Juel1)173666$$aGreb, Christian$$b5
000893891 7001_ $$0P:(DE-Juel1)173665$$aHeidtfeld, Sarah$$b6$$ufzj
000893891 7001_ $$0P:(DE-Juel1)130948$$aSchneider, Claus M.$$b7$$ufzj
000893891 773__ $$0PERI:(DE-600)3004165-X$$a10.1103/PhysRevResearch.3.033061$$gVol. 3, no. 3, p. 033061$$n3$$p033061$$tPhysical review research$$v3$$x2643-1564$$y2021
000893891 8564_ $$uhttps://juser.fz-juelich.de/record/893891/files/INV_21_JUL_006162-1.pdf
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