Magnetostatic Interactions in Self-Assembled CoxNi1–xFe2O4/BiFeO3 Multiferroic Nanocomposites

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• 作者：Shuchi Ojha ; Wallace C. Nunes ; Nicolas M. Aimon ; Caroline A. Ross
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：August 23, 2016
• 年：2016
• 卷：10
• 期：8
• 页码：7657-7664
• 全文大小：453K
• 年卷期：0
• ISSN：1936-086X

文摘

Self-assembled vertically aligned oxide nanocomposites consisting of magnetic pillars embedded in a ferroelectric matrix have been proposed for logic devices made from arrays of magnetostatically interacting pillars. To control the ratio between the nearest neighbor interaction field and the switching field of the pillars, the pillar composition Co_xNi_1–xFe₂O₄ was varied over the range 0 ≤ x ≤ 1, which alters the magnetoelastic and magnetocrystalline anisotropy and the saturation magnetization. Nanocomposites were templated into square arrays of pillars in which the formation of a “checkerboard” ground state after ac-demagnetization indicated dominant magnetostatic interactions. The effect of switching field distribution in disrupting the antiparallel nearest neighbor configuration was analyzed using an Ising model and compared with experimental results.