AI Article Synopsis
- The research focuses on the self-assembly of needle-shaped FeO nanocube structures, which exhibit enhanced magnetic properties compared to 0D and 2D configurations.
- A significant finding is a very high anisotropy factor, which is the ratio of parallel to perpendicular magnetization, indicating unique magnetic behavior not seen in traditional bulk materials.
- The study attributes the strong temperature-dependent anisotropy and its relation to particle size to a combination of dipolar interactions and net anisotropy fields due to the arrangement of the nanocubes in 1D structures.
Article Abstract
One of the ultimate goals of nanocrystal self-assembly is to transform nanoscale building blocks into a material that displays enhanced properties relative to the sum of its parts. Herein, we demonstrate that 1D needle-shaped assemblies composed of FeO nanocubes display a significant augmentation of the magnetic susceptibility and dissipation as compared to 0D and 2D systems. The performance of the nanocube needles is highlighted by a colossal anisotropy factor defined as the ratio of the parallel to the perpendicular magnetization components. We show that the origin of this effect cannot be ascribed to shape anisotropy in its classical sense; as such, it has no analogy in bulk magnetic materials. The temperature-dependent anisotropy factors of the in- and out-of-phase components of the magnetization have an extremely strong particle size dependence and reach values of 80 and 2500, respectively, for the largest nanocubes in this study. Aided by simulations, we ascribe the anisotropy of the magnetic susceptibility, and its strong particle-size dependence to a synergistic coupling between the dipolar interaction field and a net anisotropy field resulting from a partial texture in the 1D nanocube needles.
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| http://dx.doi.org/10.1021/acsnano.7b07745 | DOI Listing |
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