The transition metal dichalcogenide 1T-TaS₂ is known to exhibit a number of collective electronic states known as charge density wave (CDW) instabilities. Intriguing phenomena such as a large damping-like spin–orbit torque (SOT) have been reported in monolayer 1T-TaS₂ [Nano Lett.2020, 20 (9), 6372–6380]. Probing of CDWs in monolayer thick 1T-TaS₂ has been an inconceivable task. Here, the temperature-dependent spin dynamics and the effect of CDWs in the 1T-TaS₂(monolayer)/Ni₈₁Fe₁₉ (Py) (7 nm) heterostructure are reported. Employing ferromagnetic resonance, the effect of the different commensurate (C) and nearly commensurate (NC) CDW states on the spin dynamics during heating and cooling cycles has been characterized by use of the effective damping constant and the spin mixing conductance of the heterostructure. In addition, these CCDW and NCCDW states, which affect the SOT efficiencies due to damping- and field-like SOTs, have been evaluated by using angle-dependent planar Hall effect measurements in controlled cooling and heating cycles. Our findings provide a fundamental understanding of the effect of different CDW states on the spin dynamics in two-dimensional 1T-TaS₂ monolayer interfaced Py.

中文翻译：

---

探索 1T-TaS2 单层/Ni81Fe19 异质结构中的电荷密度波效应：自旋动力学方法

已知过渡金属二硫属化物 1T-TaS ₂表现出许多集体电子态，称为电荷密度波 (CDW) 不稳定性。在单层 1T-TaS ₂ [ Nano Lett. 2020 , 20 (9), 6372–6380]。在单层厚 1T-TaS _{2 中}探测 CDW是一项不可思议的任务。这里，温度相关的自旋动力学和 CDWs 在 1T-TaS ₂（单层）/Ni ₈₁ Fe _{19 中的影响}报道了 (Py) (7 nm) 异质结构。利用铁磁共振，不同的相称 (C) 和近相称 (NC) CDW 状态对加热和冷却循环期间自旋动力学的影响已通过使用异质结构的有效阻尼常数和自旋混合电导来表征。此外，这些 CCDW 和 NCCDW 状态由于阻尼和场状 SOT 而影响 SOT 效率，已通过在受控冷却和加热循环中使用角度相关的平面霍尔效应测量进行评估。我们的发现提供了对不同 CDW 状态对二维 1T-TaS ₂单层界面 Py 中自旋动力学影响的基本理解。