论文标题
各向异性磁二极管耦合在分层的抗铁磁feps $ _3 $
Anisotropic Magnetodielectric Coupling in Layered Antiferromagnetic FePS$_3$
论文作者
论文摘要
我们报告了各向异性磁电型（MD）耦合在分层范德华（VDW）抗铁磁性（AFM）FEPS $ _3 $（Néel温度$ t _ {\ Mathrm {n}} $ $ $ $ $ $ 120K），带有perpendicular aniscular anisistropy。上面$ t_n $，而沿\ textit {c}轴介电响应函数显示频率依赖性放松，平面内数据是频率独立的，并且揭示了与有序状态下的声子 - 动物的偏差，从而暗示与已知的旋转偶联的连接是磁性序列的指示。在低温（低于40 K）时，介电常数中的非典型异常与温度依赖性直流和AC敏感性证实。对于平面内和平面外病例，这种异常的磁性反应均显着不同。我们已经用磁内结构各向异性暗示的磁AFM-Z对齐方式的优先取向来解释这一点，如\ textit {ab-initio}计算所证实。控制磁性耦合与磁各向异性的相对强度为跟踪结构的细微修饰（例如平面各向异性）开辟了一种策略，并潜在地应用于旋转技术。
We report anisotropic magnetodielectric (MD) coupling in layered van der Waals (vdW) antiferromagnetic (AFM) FePS$_3$ (Néel temperature $T_{\mathrm{N}}$ $\sim$ 120K) with perpendicular anisotropy. Above $T_N$, while dielectric response function along \textit{c}-axis shows frequency dependent relaxations, in-plane data is frequency independent and reveals a deviation from phonon-anharmonicity in the ordered state, thereby implying a connection to spin-phonon coupling known to be indicative of onset of magnetic ordering. At low temperature (below 40 K), atypical anomaly in the dielectric constant is corroborated with temperature dependent DC and AC susceptibility. The magnetodielectric response across this anomaly differs significantly for both, in-plane and out-of-plane cases. We have explained this in terms of preferential orientation of magnetic AFM-z alignment, implied by the in-plane structural anisotropy as confirmed by \textit{ab-initio} calculations. Controlling relative strength of magnetodielectric coupling with magnetic anisotropy opens up a strategy for tracking subtle modifications of structure, such as in-plane anisotropy, with potential application to spintronic technologies.
