Anisotropic Gigahertz Antiferromagnetic Resonances of the Easy-Axis van der Waals Antiferromagnet CrSBr
Anisotropic Gigahertz Antiferromagnetic Resonances of the Easy-Axis van der Waals Antiferromagnet CrSBr
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DOI：
10.1021/acs.nanolett.2c02124
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发表时间：
2022-08-04
期刊：
影响因子：
10.8
通讯作者：
Luo, Yunqiu Kelly
中科院分区：
文献类型：
--
作者：
Cham, Thow Min Jerald;Karimeddiny, Saba;Luo, Yunqiu Kelly
本文报道了货车易轴反铁磁体CrSBr的反铁磁共振测量结果。层间交换场和磁晶各向异性场可与实验室磁场相媲美，从而可以获得多种千兆赫兹频率的动力学模式。通过将共振频率映射为外加磁场的大小和角度的函数，我们确定了反铁磁动力学的不同制度。的光谱表现出良好的协议与Landau-Lifshitz模型的两个反铁磁耦合的子晶格，占层间交换和三轴磁各向异性。拟合使我们能够量化控制磁动力学的参数：在5 K时，层间交换场为mu H-0（E）= 0.395（2）T，硬轴和中间轴各向异性参数为mu H-0（c）= 1.30（2）T和mu H-0（a）= 0.383（7）T。面内各向异性的存在使得可以使用面内磁场来控制反铁磁共振之间的杂化程度。
We report measurements of antiferromagnetic resonances in the van der Waals easy-axis antiferromagnet CrSBr. The interlayer exchange field and magnetocrystalline anisotropy fields are comparable to laboratory magnetic fields, allowing a rich variety of gigahertz-frequency dynamical modes to be accessed. By mapping the resonance frequencies as a function of the magnitude and angle of applied magnetic field, we identify the different regimes of antiferromagnetic dynamics. The spectra show good agreement with a Landau-Lifshitz model for two antiferromagnetically coupled sublattices, accounting for interlayer exchange and triaxial magnetic anisotropy. Fits allow us to quantify the parameters governing the magnetic dynamics: At 5 K, the interlayer exchange field is mu H-0(E) = 0.395(2) T, and the hard and intermediate-axis anisotropy parameters are mu H-0(c) = 1.30(2) T and mu H-0(a) = 0.383(7) T. The existence of within-plane anisotropy makes it possible to control the degree of hybridization between the antiferromagnetic resonances using an in-plane magnetic field.