论文标题
与dzyaloshinskii-moriya相互作用的合成反铁磁铁中的非偏磁性波波
Nonreciprocal magnetoacoustic waves in synthetic antiferromagnets with Dzyaloshinskii-Moriya interaction
论文作者
论文摘要
压电/磁性薄膜异质结构中表面声波（锯）和自旋波（SWS）之间的相互作用为实现新颖的微波设备和镁化的应用而产生了潜力。在目前的工作中，我们研究了pt/co（2 nm）/ru（0.85 nm）/co（4 nm）/pt合成抗fiferromagnet（SAF）中的SAW-SW相互作用，该抗铁磁层（SAF）由两个由薄的非磁性Ru Ru Spacer层隔开，其厚度不同。由于界面Dzyaloshinskii-moriya相互作用（IDMI）和层间偶极耦合场的综合存在，光学SW模式显示出具有相对传播的SWS的较大非细胞分散性关系。由于SAW-SW的相互作用，我们观察到压电/SAF混合设备中的非偏置锯传输。两个CO层的平衡磁化方向均由外部磁场操纵，以设置铁磁，倾斜或抗铁磁构型。这对SW色散，其非交流和SAW-SW相互作用有很大的影响。实验结果与现象学SAW-SW相互作用模型一致，该模型考虑了SWS的层间交换耦合，IDMI和层间偶极偶联场。
The interaction between surface acoustic waves (SAWs) and spin waves (SWs) in a piezoelectric/magnetic thin film heterostructure yields potential for the realization of novel microwave devices and applications in magnonics. In the present work, we investigate the SAW-SW interaction in a Pt/Co(2 nm)/Ru(0.85 nm)/Co(4 nm)/Pt synthetic antiferromagnet (SAF) composed of two ferromagnetic layers with different thicknesses separated by a thin nonmagnetic Ru spacer layer. Because of the combined presence of interfacial Dzyaloshinskii--Moriya interaction (iDMI) and interlayer dipolar coupling fields, the optical SW mode shows a large nondegenerate dispersion relation for oppositely propagating SWs. Due to SAW-SW interaction, we observe nonreciprocal SAW transmission in the piezoelectric/SAF hybrid device. The equilibrium magnetization directions of both Co layers are manipulated by an external magnetic field to set a ferromagnetic, canted, or antiferromagnetic configuration. This has a strong impact on the SW dispersion, its nonreciprocity, and SAW-SW interaction. The experimental results are in agreement with a phenomenological SAW-SW interaction model, which considers the interlayer exchange coupling, iDMI, and interlayer dipolar coupling fields of the SWs.
