CMP Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, 700 064, India.
Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India.
Sci Rep. 2017 Jun 12;7(1):3220. doi: 10.1038/s41598-017-03451-z.
In this work we have carried out an elaborate study on the magnetic properties and investigated the exchange bias phenomena of some charge-ordered (CO) manganites. The detailed study of Sm Ca MnO (x = 0.5, 0.55, 0.6, 0.65, 0.7) compounds shows that SmCaMnO, which is the most robust charge ordered material studied here, shows significantly large exchange bias field (H) as compared to the other compounds. Our experimental results and analysis indicate that T, which reflects the stability of the charge-ordered state, is one of the key parameters for the exchange bias effect. Similar behaviour is found in other rare-earth analogues, viz., La Ca MnO and Pr Ca MnO compounds as well. We also found that with increasing stability of CO states in Sm Ca MnO compounds, H enhances due to increase in number and reduction in size of ferromagnetic clusters.
在这项工作中，我们对一些有序电荷（CO）锰氧化物的磁性进行了精心研究，并研究了交换偏置现象。对 SmCaMnO（x=0.5、0.55、0.6、0.65、0.7）化合物的详细研究表明，SmCaMnO 是这里研究的最稳定的有序电荷材料，与其他化合物相比，显示出明显较大的交换偏置场（H）。我们的实验结果和分析表明，T 反映了电荷有序态的稳定性，是交换偏置效应的关键参数之一。在其他稀土类似物，即 LaCaMnO 和 PrCaMnO 化合物中也发现了类似的行为。我们还发现，随着 SmCaMnO 化合物中 CO 态稳定性的增加，由于铁磁簇数量的增加和尺寸的减小，H 增强。
