Spin‐phonon coupling and two‐magnons scattering behaviors in hexagonal NiAs‐type antiferromagnetic MnTe epitaxial films,Journal of Raman Spectroscopy

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Spin‐phonon coupling and two‐magnons scattering behaviors in hexagonal NiAs‐type antiferromagnetic MnTe epitaxial films
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-07-06 , DOI: 10.1002/jrs.5928
Jiyue Zhang ₁ , Qin Lian ₁ , Zhiqiang Pan ₁ , Wei Bai ₁ , Jing Yang ₁ , Yuanyuan Zhang ₁ , Xiaodong Tang _{1,

2} , Junhao Chu ₁

Affiliation

Temperature‐dependent Raman scattering spectra of NiAs‐type MnTe epitaxial films were measured to explore the temperature evolution of phonon modes and especially the spin‐phonon coupling across Néel temperature (T_N). A significant deviation from an anharmonic mode below T_N strongly supports the existence of spin‐phonon interaction, and its coupling strength is calculated to be approximately −0.16 cm⁻¹ from the E_2g phonon. Two‐magnons (2M) scattering is found, which is proposed to closely relate to the nearest neighbor (NN) exchange interaction. These data elucidate the nature of the spin‐phonon coupling in antiferromagnetic (AFM) MnTe and can avail to develop MnTe‐based AFM spintronic devices.

中文翻译：

六角形NiAs型反铁磁MnTe外延膜中的自旋声子耦合和双磁子散射行为

测量了NiAs型MnTe外延膜的温度依赖性拉曼散射光谱，以研究声子模态的温度演化，尤其是在整个Néel温度（T _N）下的自旋声子耦合。低于T _N的非谐模式的显着偏离有力地支持了自旋声子相互作用的存在，其耦合强度经计算与E _2g声子大约为-0.16 cm ^-1。发现了两磁子（2M）散射，这被认为与最近邻（NN）交换相互作用密切相关。这些数据阐明了反铁磁（AFM）MnTe中自旋声子耦合的性质，并可用于开发基于MnTe的AFM自旋电子器件。

更新日期：2020-07-06

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