普鲁士蓝类似物薄膜的磁各向异性
Magnetic anisotropy in thin films of Prussian blue analogues
摘要：
薄介质的磁各向异性（~ 200 nm）和厚度（~ 2 $μ$ m）薄膜和多晶对普鲁士蓝类似物$_{0.7}$ $_{4.0}$ [Cr（CN）$_6$ ] $_{2.9} \cdot n$ $_2$ O（一种含$T_c \sim 70$ K的铁磁材料）的粉末（直径约60 nm）进行了磁化、50 GHz和116 GHz的ESR、和变温X射线衍射（XRD）。各向异性磁响应的起源不能归因于固体支持物的直接影响，但是保持有组织的二维膜的膜生长协议是重要的。此外，各向异性既不是由各向异性g张量引起的，也不是由$T_c$上下的磁晶格变化引起的。通过考虑由于磁畴和退磁因素的影响，该分析提供了低场和高场数据的合理描述，从而识别磁各向异性的起源。
英文摘要：
The magnetic anisotropy of thin (~ 200 nm) and thick (~ 2 $μ$m) films and of polycrystalline (diameters ~ 60 nm) powders of the Prussian blue analogue Rb$_{0.7}$Ni$_{4.0}$[Cr(CN)$_6$]$_{2.9} \cdot n$H$_2$O, a ferromagnetic material with $T_c \sim 70$ K, have been investigated by magnetization, ESR at 50 GHz and 116 GHz, and variable-temperature x-ray diffraction (XRD). The origin of the anisotropic magnetic response cannot be attributed to the direct influence of the solid support, but the film growth protocol that preserves an organized two-dimensional film is important. In addition, the anisotropy does not arise from an anisotropic g-tensor nor from magneto-lattice variations above and below $T_c$. By considering effects due to magnetic domains and demagnetization factors, the analysis provides reasonable descriptions of the low and high field data, thereby identifying the origin of the magnetic anisotropy.
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