Mohan Manu, Nayak Sanjib, Pal Arnab, Murugavel P
Pervoskite Materials Laboratory, Functional Oxides Research Group (FORG), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
J Phys Condens Matter. 2023 Aug 31;35(47). doi: 10.1088/1361-648X/acf1ea.
Rare-earth orthochromite is an interesting system in the view of its complex magnetic ordering due to competing interaction between different magnetic ions. Here, Fe-substituted SmCrOsamples were prepared by solid-state route to investigate their intriguing magnetic properties towards exploring its application potential. The magnetic studies revealed antiferromagnetic (AFM) ordering at Nèel temperature () ∼ 181 K, magnetic compensation temperatures () at ∼137 K and 50 K, and spin-reorientation temperature () at 64 K in SmCrFeOsample. Additionally, the system exhibited negative magnetization under field-cooled conditions which allowed the field as well as temperature controllable magnetization switching behavior. Notably, the Fe-substituted SmCrOsample displayed a remarkable exchange bias () value of ∼1.39 T at 10 K due to the coexistence of ferromagnetic and AFM ordering at different cationic sites. The-loops recorded under positive and negative field-cooled conditions ruled out the minor-loop effect. Theoretical models applied on the training effect studies confirmed the observed exchange-bias effect.
从不同磁性离子之间的竞争相互作用导致其复杂的磁有序这一角度来看，稀土正铬酸盐是一个有趣的体系。在此，通过固态路线制备了铁取代的钐铬酸盐样品，以研究其引人入胜的磁性能，从而探索其应用潜力。磁性研究表明，在钐铬铁氧体样品中，奈尔温度（(T_N)）约为181K时存在反铁磁（AFM）有序，在约137K和50K时存在磁补偿温度（(T_{comp})），在64K时存在自旋重取向温度（(T_{SR})）。此外，该体系在场冷条件下表现出负磁化强度，这使得磁场以及温度可控的磁化翻转行为成为可能。值得注意的是，由于在不同阳离子位点存在铁磁和反铁磁有序共存，铁取代的钐铬酸盐样品在10K时显示出约1.39T的显著交换偏置（(H_{ex})）值。在正负场冷条件下记录的磁滞回线排除了小回线效应。应用于训练效应研究的理论模型证实了观察到的交换偏置效应。
