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000901912 0247_ $$2doi$$a10.1103/PhysRevResearch.3.043025
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000901912 1001_ $$0P:(DE-Juel1)173665$$aHeidtfeld, Sarah$$b0
000901912 245__ $$aGeneration of terahertz transients from Co 2 Fe 0.4 Mn 0.6 Si -Heusler-alloy/normal-metal nanobilayers excited by femtosecond optical pulses
000901912 260__ $$aCollege Park, MD$$bAPS$$c2021
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000901912 520__ $$aWe generated pulses of electromagnetic radiation in the terahertz (THz) frequency range by optical excitation of Co2Fe0.4Mn0.6Si (CFMS)/normal-metal (NM) bilayer structures. The CFMS is a Heusler alloy showing a band gap in one spin channel and is therefore a half metal. We compared the THz emission efficiency in a systematic manner for four different CFMS/NM bilayers, where NM was either Pt, Ta, Cr, or Al. Our measurements show that the THz intensity is highest for a Pt capping. We also demonstrate the tunability of the THz amplitude by varying the magnetic field for all four bilayers. We attribute the THz generation to the inverse spin Hall effect. In order to investigate the role of the interface in THz generation, we measured the spin mixing conductance for each CFMS/NM bilayer using a ferromagnetic resonance method. We found that the spin-orbit coupling cannot completely describe the THz generation in the bilayers and that the spin transmission efficiency of the CFMS/NM interface and the spin diffusion length, as well as the oxidation of the NM layer, play crucial roles in the THz emission process.
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000901912 7001_ $$0P:(DE-Juel1)130495$$aAdam, Roman$$b1$$eCorresponding author
000901912 7001_ $$00000-0002-4981-1977$$aKubota, Takahide$$b2
000901912 7001_ $$0P:(DE-HGF)0$$aTakanashi, Koki$$b3
000901912 7001_ $$0P:(DE-Juel1)177876$$aCao, Derang$$b4$$ufzj
000901912 7001_ $$0P:(DE-Juel1)162347$$aSchmitz-Antoniak, Carolin$$b5
000901912 7001_ $$0P:(DE-Juel1)130582$$aBürgler, Daniel E.$$b6
000901912 7001_ $$0P:(DE-Juel1)174477$$aWang, Fangzhou$$b7$$ufzj
000901912 7001_ $$0P:(DE-Juel1)173666$$aGreb, Christian$$b8
000901912 7001_ $$00000-0003-2145-5672$$aChen, Genyu$$b9
000901912 7001_ $$0P:(DE-HGF)0$$aKomissarov, Ivan$$b10
000901912 7001_ $$0P:(DE-Juel1)125593$$aHardtdegen, Hilde$$b11
000901912 7001_ $$0P:(DE-Juel1)128613$$aMikulics, Martin$$b12
000901912 7001_ $$00000-0003-0868-0779$$aSobolewski, Roman$$b13
000901912 7001_ $$aSuga, Shigemasa$$b14
000901912 7001_ $$0P:(DE-Juel1)130948$$aSchneider, Claus M.$$b15
000901912 773__ $$0PERI:(DE-600)3004165-X$$a10.1103/PhysRevResearch.3.043025$$gVol. 3, no. 4, p. 043025$$n4$$p043025$$tPhysical review research$$v3$$x2643-1564$$y2021
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