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We have studied ferromagnetic metal/topological insulator bilayer system tounderstand magnetization dynamics of ferromagnetic metal (FM) in contact with atopological insulator (TI). At magnetic resonance condition, the precessingmagnetization in the metallic ferromagnet ($Ni_{80}Fe_{20}$) injects spincurrent into the topological insulator ($BiSbTe_{1.5}Se_{1.5}$), a phenomenonknown as spin-pumping. Due to the spin pumping effect, fast relaxation in theferromagnet results in the broadening of ferromagnetic resonance linewidth($\Delta H$). We evaluated the parameters like effective Gilbert dampingcoefficient ($\alpha_{eff}$), spin-mixing conductance ($g_{eff}^{\uparrow\downarrow}$) and spin current density ($j_S^0$) to confirm a successful spininjection due to spin-pumping into the $BiSbTe_{1.5}Se_{1.5}$ layer. TIs embodya spin-momentum locked surface state that span the bulk band-gap. It can actdifferently to the FM magnetization than the other normal metals. To probe theeffect of topological surface state, a systematic low temperature study iscrucial as surface state of TI dominates at lower temperatures. The exponentialgrowth of $\Delta H$ for all different thickness combination of FM/TI bilayersand effective Gilbert damping coefficient ($\alpha_{eff}$) with loweringtemperature confirms the prediction that spin chemical bias generated fromspin-pumping induces surface current in TI due to spin-momentum locking. Thehump-like feature of magnetic anisotropy field ($H_K$)of the bilayer around 60Ksuggests that the decrease of interfacial in-plane magnetic anisotropy canresult from exchange coupling between the TI surface state and the localmoments of FM layer.

Experimental investigation of the effect of topological insulator on the  magnetization dynamics of ferromagnetic metal: $BiSbTe_{1.5}Se_{1.5}$ and  $Ni_{80}Fe_{20}$ heterostructure