arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.14559cond-mat.mtrl-scicond-mat.str-el
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范德华磁体CrCl $_3$高场相的电子自旋共振和铁磁共振谱

Electron spin resonance and ferromagnetic resonance spectroscopy in the high-field phase of the van der Waals magnet CrCl$_3$

J. Zeisner, K. Mehlawat, A. Alfonsov, M. Roslova, T. Doert, A. Isaeva, B. Büchner, V. Kataev

摘要:

我们报告了一个全面的高场/高频电子自旋共振(ESR)的范德瓦耳斯磁体CrCl $_3$单晶的研究。这种材料,虽然被称为相当长的一段时间,最近已经收到了显著的关注,在使用范德华磁体的背景下,在新的自旋电子器件。在4和175 K之间进行与温度相关的测量的共振场,并与外部磁场施加平行和垂直于蜂窝状平面的晶体结构。这些研究表明,共振线从顺磁共振位置已经在温度远高于过渡到磁有序状态。从而建立了铁磁短程关联的存在,证明了标题化合物的磁性本质上是二维的。为了研究低温下场致有效铁磁态的磁各向异性,在4K下进行了频率相关铁磁共振(FMR)测量。两个磁场方向之间所观察到的各向异性进行了分析,通过数值模拟的基础上的唯象理论的FMR。这些模拟是在良好的协议与测量数据,如果考虑到所研究的晶体的形状各向异性,而磁晶各向异性被发现是可以忽略不计的CrCl $_3$。因此,不存在显著的固有各向异性使得这种材料成为实际上理想的各向同性海森堡磁体。

英文摘要:

We report a comprehensive high-field/high-frequency electron spin resonance (ESR) study on single crystals of the van der Waals magnet CrCl$_3$. This material, although being known for quite a while, has received recent significant attention in a context of the use of van der Waals magnets in novel spintronic devices. Temperature-dependent measurements of the resonance fields were performed between 4 and 175 K and with the external magnetic field applied parallel and perpendicular to the honeycomb planes of the crystal structure. These investigations reveal that the resonance line shifts from the paramagnetic resonance position already at temperatures well above the transition into a magnetically ordered state. Thereby the existence of ferromagnetic short-range correlations above the transition is established and the intrinsically two-dimensional nature of the magnetism in the title compound is proven. To study details of the magnetic anisotropies in the field-induced effectively ferromagnetic state at low temperatures, frequency-dependent ferromagnetic resonance (FMR) measurements were conducted at 4 K. The observed anisotropy between the two magnetic-field orientations is analyzed by means of numerical simulations based on a phenomenological theory of FMR. These simulations are in excellent agreement with measured data if the shape anisotropy of the studied crystal is taken into account, while the magnetocrystalline anisotropy is found to be negligible in CrCl$_3$. The absence of a significant intrinsic anisotropy thus renders this material as a practically ideal isotropic Heisenberg magnet.

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