High temperature spin reorientation, magnetization reversal and magnetocaloric effect in 50% Mn substituted polycrystalline ErFeO3
High temperature spin reorientation, magnetization reversal and magnetocaloric effect in 50% Mn substituted polycrystalline ErFeO3
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DOI：
10.1016/j.jssc.2019.120910
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发表时间：
2019-11
影响因子：
3.3
通讯作者：
Karthika Chandran;P. N. Lekshmi;P. Santhosh
中科院分区：
文献类型：
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作者：
Karthika Chandran;P. N. Lekshmi;P. Santhosh
通过X射线衍射、磁化强度和比热测量研究了50%Mn取代ErFeO 3的结构、磁性和磁热性能。ErFe_（0.5）Mn_（0.5）O_3晶体为正交晶系（Pbnm）。直流磁化强度和比热研究指出两个磁转变：（i）Fe 3 +/Mn 3+有序化，TN~ 245 K和（ii）自旋重取向转变，TSR~ 218 K。在低于TSR时，ErFe_（0.5）Mn_（0.5）O_3的磁化强度和矫顽力均降低，这可能是由于发生了一个Γ4-Γ 1的磁转变。有趣的是，我们已经观察到在较低的温度下，在较低的外加磁场（<50 Oe）的磁场冷却曲线中的负磁化，作为顺磁Er 3+的磁矩与由Mn 3+从富Mn区域有序化产生的内场的极化的结果。在9.5K，外加磁场为7 T时，磁熵变（-ΔSm）为13.4J/kg·K。
The structural, magnetic and magnetocaloric properties of 50% Mn substituted ErFeO3are studied by X-ray diffraction, magnetization and specific heat measurements. ErFe0.5Mn0.5O3crystallizes in an orthorhombic structure (Pbnm). DC magnetization and specific heat studies point to two magnetic transitions: (i) Fe3+/Mn3+ordering, TN~ 245 K and (ii) spin re-orientation transition, TSR~ 218 K. Below TSR, ErFe0.5Mn0.5O3exhibits a reduction in magnetization and coercivity which could be due to a Γ4-Γ1magnetic transition. Interestingly, we have observed a negative magnetization in field cooled curves at lower temperatures under lower applied fields (<50 Oe) as a result of the polarization of paramagnetic Er3+moments with the internal field created by Mn3+ordering from the Mn-rich regions. A significant magnetic entropy change (-ΔSm) of 13.4 J/kg.K is also observed at 9.5 K for an applied field of 7 T.