Magnetic anisotropy in thin films of Prussian blue analogues

Details Magnetic anisotropy in thin films of Prussian blue analogues Magnetic anisotropy in thin films of Prussian blue analogues

2010-06-18

arxiv.org/abs/1006.3801v2

Phys. Rev. B 82, 214405 (2010) [5 pages]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, corrected and expanded version

Scientific paper

10.1103/PhysRevB.82.214405

The magnetic anisotropy of thin (~ 200 nm) and thick (~ 2 $\mu$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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