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Spin Frustration Drives Exchange Bias Sign Crossover in CoFe2O4–Cr2O3 Nanocomposites
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-07-17 , DOI: 10.1002/adfm.201900030 Martín Testa‐Anta 1 , Beatriz Rivas‐Murias 1 , Verónica Salgueiriño 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-07-17 , DOI: 10.1002/adfm.201900030 Martín Testa‐Anta 1 , Beatriz Rivas‐Murias 1 , Verónica Salgueiriño 1
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A combined Raman spectroscopy and magnetometry study of CoFe2O4–Cr2O3 nanocomposites demonstrates the presence of spin–phonon interactions and exchange bias at the interface between the ferrimagnetic CoFe2O4 and the antiferromagnetic and magnetoelectric Cr2O3 phases. The pinned layer of uncompensated spins at the surface of the chromium oxide nanocrystals provides a source of unidirectional anisotropy and changes the sign of the exchange bias when transitioning from a canted to a frustrated situation, that is, as increasing the percentage of CoFe2O4 or decreasing the percentage of Cr2O3 in the composites. This assessment of the distinctive interfaces attained in the final oxide heterostructures offers a prospective route for hybrid materials which uphold a magnetoelectric effect.
中文翻译：
自旋失意驱动了CoFe2O4–Cr2O3纳米复合材料的交换偏置符号交叉。
CoFe 2 O 4 -Cr 2 O 3纳米复合材料的拉曼光谱和磁力分析研究表明，在亚铁磁CoFe 2 O 4与反铁磁和磁电Cr 2 O 3相之间的界面处存在自旋声子相互作用和交换偏压。在氧化铬纳米晶体表面的未补偿自旋的固定层提供了单向各向异性的来源，并在从倾斜状态转变为沮丧状态时改变了交换偏压的征兆，即随着CoFe 2 O 4百分比的增加或降低复合材料中Cr 2 O 3的百分比。对最终氧化物异质结构中获得的独特界面的这种评估为维持磁电效应的混合材料提供了一条预期途径。
更新日期：2019-07-17
中文翻译：
自旋失意驱动了CoFe2O4–Cr2O3纳米复合材料的交换偏置符号交叉。
CoFe 2 O 4 -Cr 2 O 3纳米复合材料的拉曼光谱和磁力分析研究表明，在亚铁磁CoFe 2 O 4与反铁磁和磁电Cr 2 O 3相之间的界面处存在自旋声子相互作用和交换偏压。在氧化铬纳米晶体表面的未补偿自旋的固定层提供了单向各向异性的来源，并在从倾斜状态转变为沮丧状态时改变了交换偏压的征兆，即随着CoFe 2 O 4百分比的增加或降低复合材料中Cr 2 O 3的百分比。对最终氧化物异质结构中获得的独特界面的这种评估为维持磁电效应的混合材料提供了一条预期途径。
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