Abstract A large lattice mismatch (>10%) system was designed, consisting of epitaxial BaTiO3 matrix and Ni nanocrystals (NCs). The interfacial stress was fully released by the formation of three-dimensional islands Ni NCs with a preferred (111) orientation. We further demonstrated that the elastic energy of (111) was much smaller than the (100) planes. The remarkable dielectric tunability of 0.41 at 100 Oe was obtained, attributing to the large magnetoelastic energy ΔH = 0.096 eV. Due to the smaller magnetoelastic energy density (2.32 × 106 J/m3) relative to the magnetocrystalline anisotropy energy densities, magnetically polarized Ni NCs could overcome the anisotropy field and diamagnetism of the BaTiO3 matrix, resulting in the easily tunable dielectric properties with a weak magnetic field. These discoveries represent great potential for magnetoelectric devices.

中文翻译：

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Ni纳米晶体嵌入BaTiO3薄膜的高磁介电可调性

摘要 设计了一个大晶格失配（>10%）系统，由外延 BaTiO3 基体和 Ni 纳米晶体（NCs）组成。通过形成具有优选 (111) 取向的三维岛状 Ni NCs 来完全释放界面应力。我们进一步证明（111）的弹性能比（100）平面小得多。在 100 Oe 下获得了 0.41 的显着介电可调性，这归因于大磁弹性能 ΔH = 0.096 eV。由于磁弹性能量密度 (2.32 × 106 J/m3) 相对于磁晶各向异性能量密度较小，磁极化的 Ni NCs 可以克服 BaTiO3 基体的各向异性场和抗磁性，从而导致易于调节的介电性能和弱磁性场地。