A. Kumari, F. Zainab, A. Mishra, W. W. Tjiu, Z. Aabdin, V. R. Singh
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Synchrotron-based x-ray absorption spectroscopic (XAS) measurements in the total electron yield mode examined local electronic structures affirming the formation of CMO with uncompensated electronic states involving Co2+, Co3+, Mn2+, Mn3+, and Mn4+ cations. Concurrently, XAS and x-ray magnetic circular dichroism analyses revealed antiferromagnetic coupling within Co and Mn sublattices in CMO, indicating the presence of uncompensated electronic states. Vibrating sample magnetometry results demonstrated clear hysteresis behavior, explicitly indicating the coexistence of super-paramagnetic and canted antiferromagnetic characteristics in CMO, as validated through the Langevin function fitting and x-ray magnetic circular dichroism results. The noticeable absence of saturated magnetization confirmed the high degree of spin canting, primarily stemming from the presence of the Yafet–Kittel spin arrangement.","PeriodicalId":170900,"journal":{"name":"Journal of Vacuum Science & Technology A","volume":"127 47","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Strong signature of uncompensated magnetization in frustrated cobalt manganites using x-ray magnetic circular dichroism study\",\"authors\":\"A. Kumari, F. Zainab, A. Mishra, W. W. Tjiu, Z. Aabdin, V. R. 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Synchrotron-based x-ray absorption spectroscopic (XAS) measurements in the total electron yield mode examined local electronic structures affirming the formation of CMO with uncompensated electronic states involving Co2+, Co3+, Mn2+, Mn3+, and Mn4+ cations. Concurrently, XAS and x-ray magnetic circular dichroism analyses revealed antiferromagnetic coupling within Co and Mn sublattices in CMO, indicating the presence of uncompensated electronic states. Vibrating sample magnetometry results demonstrated clear hysteresis behavior, explicitly indicating the coexistence of super-paramagnetic and canted antiferromagnetic characteristics in CMO, as validated through the Langevin function fitting and x-ray magnetic circular dichroism results. 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引用次数: 0
摘要
由于混合尖晶石氧化物在电子学、自旋电子学、磁学、催化和电化学储能等领域具有重要的技术意义,本研究的重点是研究混合尖晶石氧化物的扭曲四方相。在此,我们报告了溶胶法合成的多价钴锰酸盐 CoMn2O4 (CMO),并对其进行了全面分析,以阐明它们在室温下的物理化学特性。利用粉末 X 射线衍射图样和电子显微镜(包括场发射扫描电子显微镜和高分辨率透射电子显微镜)进行分析的结果证实,混合 CMO 形成了一种纯净且异常结晶的扭曲四方相。基于同步加速器的 X 射线吸收光谱(XAS)测量在电子总产率模式下检查了局部电子结构,确认形成的 CMO 具有涉及 Co2+、Co3+、Mn2+、Mn3+ 和 Mn4+ 阳离子的未补偿电子态。同时,XAS 和 X 射线磁性圆二色性分析揭示了 CMO 中 Co 和 Mn 亚晶格内的反铁磁耦合,表明存在未补偿电子态。振动样品磁力测量结果显示出明显的磁滞行为,明确表明 CMO 中同时存在超顺磁性和斜向反铁磁性特征,朗文函数拟合和 X 射线磁性圆二色性结果也验证了这一点。饱和磁化的明显缺失证实了高度的自旋悬臂,这主要源于 Yafet-Kittel 自旋排列的存在。
Strong signature of uncompensated magnetization in frustrated cobalt manganites using x-ray magnetic circular dichroism study
The present study is focused on the investigation of the distorted tetragonal phase of mixed spinel oxides, due to their technological relevance in the field of electronics, spintronics, magnetism, catalysis, and electrochemical energy storage. Herein, we report on solgel synthesized multivalent cobalt manganites, CoMn2O4 (CMO), and subjected them to a comprehensive analysis to elucidate their physicochemical characteristics at room temperature. Analysis employing powder x-ray diffraction patterns and electron microscopy (including field-emission scanning electron microscopy and high-resolution transmission electron microscopy) results confirmed the formation of a pure and exceptionally crystalline, distorted tetragonal phase of mixed CMO. Synchrotron-based x-ray absorption spectroscopic (XAS) measurements in the total electron yield mode examined local electronic structures affirming the formation of CMO with uncompensated electronic states involving Co2+, Co3+, Mn2+, Mn3+, and Mn4+ cations. Concurrently, XAS and x-ray magnetic circular dichroism analyses revealed antiferromagnetic coupling within Co and Mn sublattices in CMO, indicating the presence of uncompensated electronic states. Vibrating sample magnetometry results demonstrated clear hysteresis behavior, explicitly indicating the coexistence of super-paramagnetic and canted antiferromagnetic characteristics in CMO, as validated through the Langevin function fitting and x-ray magnetic circular dichroism results. The noticeable absence of saturated magnetization confirmed the high degree of spin canting, primarily stemming from the presence of the Yafet–Kittel spin arrangement.