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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Tunable complex magnetic states of epitaxial core-shell metal oxide nanocrystals fabricated by the phase decomposition method
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Tunable complex magnetic states of epitaxial core-shell metal oxide nanocrystals fabricated by the phase decomposition method

机译：相分解法制备的外延核-壳金属氧化物纳米晶体的可调谐复磁态

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We report on the successful fabrication of epitaxial-discrete CoxFe3-xO4/CoO magnetic nanostructures on a SrTiO3 substrate as well as the results of a thorough investigation of the magnetic cross-reactions of the two phases in the vicinity of the epitaxial junction. These nanostructures were originally prepared as Fe3O4-CoO core-shell structures through the phase decomposition of bismuth perovskite precursors by pulsed-laser deposition. An antiphase boundary emerged during the structural/electronic transition from the CoO core to the Co1-xFe2+XO4 shell; this then developed into a ferrimagnetic/antiferromagnetic interface. Uncompensated spins (UCS) arose from the CoxFe3-xO4/CoO interface as a result of strong ferrimagnetic-antiferromagnetic interactions. A notable exchange bias as well as a significant exchange enhancement was observed owing to the UCS, which had a locking effect because of the decoupling of the Co1-xFe2+XO4/CoO reversal from the antiphase boundary. Control of the precursor ratio allowed for the fine-tuning of the Co1-xFe2+XO4 phase and the associated locking behaviors. This, in turn, allowed the anisotropy and coercivity of the nanostructures to be manipulated. Thus, we were able to create and thoroughly understand a complex epitaxial configuration with tunable structural and magnetic properties. This study should open new opportunities with regard to current magnetic oxide technology, which requires novel methods for pursuing extremity of controllable properties over an atomic landscape.
机译：我们报告了在SrTiO3衬底上成功制造外延离散CoxFe3-xO4 / CoO磁性纳米结构，以及对在外延结附近的两相的磁交叉反应进行彻底研究的结果。这些纳米结构最初是通过脉冲激光沉积通过钙钛矿型铋前体的相分解而制成的Fe3O4-CoO核壳结构。在从CoO核到Co1-xFe2 + XO4壳的结构/电子过渡过程中出现了反相边界。然后将其发展为铁磁/反铁磁界面。由于强铁磁-反铁磁相互作用，CoxFe3-xO4 / CoO界面产生了未补偿的自旋（UCS）。由于UCS，观察到显着的交换偏差以及显着的交换增强，这是由于Co1-xFe2 + XO4 / CoO反转从反相边界解耦而具有锁定作用。通过控制前驱物比例，可以对Co1-xFe2 + XO4相及其相关的锁定行为进行微调。反过来，这使得可以控制纳米结构的各向异性和矫顽力。因此，我们能够创建并彻底理解具有可调结构和磁性的复杂外延结构。这项研究应为当前的磁性氧化物技术开辟新的机遇，这要求在原子景观上追求可控性质的极端的新方法。

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