SmMnO3 多晶粉末中的场驱动自旋重定向,Journal of Alloys and Compounds

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SmMnO3 多晶粉末中的场驱动自旋重定向
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jallcom.2020.156327
John Mantilla , Marco Morales , Wenderson Venceslau , Laura Corredor , P.C. Morais , Fermin F.H. Aragón , Sebastião William da Silva , Jose A. Coaquira

摘要 SmMnO3 钙钛矿系统显示出有趣的磁性，使其成为具有特殊技术应用吸引力的材料。然而，这些材料在纳米尺寸上表现出的特性可能与其体尺寸显着不同。在这方面，本文报道了使用溶胶-凝胶法成功合成 SmMnO3 多晶粉末。研究了所制备样品的结构、形态、振动和磁性。X 射线衍射图显示单钙钛矿 SmMnO3 晶相结构，晶体尺寸约为 70 nm。室温拉曼光谱证实了通过 XRD 观察到的钙钛矿 SmMnO3 晶体结构的形成。直流磁测量显示在 60 K (TN ≈ 60 K) 处发生类似反铁磁的转变，由于 Mn3+ 自旋的反铁磁排序，磁性测量还揭示了温度诱导的磁化反转现象，其特征是磁补偿温度 (Tcomp ≈ 6 K)，归因于弱铁磁 Mn3+- 和 Sm3+- 离子磁矩的反平行取向通过 Sm3+-Mn3+ 交换相互作用。与先前对 SmMnO3 的研究相比，从合成的 SmMnO3 样品中记录的磁化环包含一些奇异性，这些奇异性被指定为颗粒的小粒径和单域特征，其特征在于两个明确定义的异常，两者都与自旋反转现象：一个在低场显示增加和减少的分支相互交叉；另一个在高场显示突然跳跃。

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Field-driven spin reorientation in SmMnO3 polycrystalline powders

Abstract The SmMnO3 perovskite system shows interesting magnetic properties and making them an attractive material for specific technological application. However, these materials on nanosized dimension display properties that can be significantly different from their bulk dimension. In this regard, using the sol-gel method, the successful synthesis of SmMnO3 polycrystalline powders is herein reported. The structure, morphology, vibrational and magnetic properties of the as-produced sample have been investigated. X-ray diffraction pattern shows a single-perovskite SmMnO3 crystalline phase structure, with a crystalline size of ∼70 nm. The room temperature Raman spectrum confirms the formation of the perovskite SmMnO3 crystalline structure observed by XRD. DC magnetic measurements show an antiferromagnetic-like transition at 60 K (TN ≈ 60 K), attributed to the antiferromagnetic ordering of the Mn3+ spins, magnetic measurements also reveal a temperature-induced magnetization reversal phenomenon characterized by the magnetic compensation temperature (Tcomp ≈ 6 K), attributed to antiparallel orientation of weak ferromagnetic Mn3+- and Sm3+-ion magnetic moments induced by Sm3+-Mn3+ exchange interaction. Magnetization loops, recorded from the as-synthesized SmMnO3 sample contain some singularity compared to previous studies of SmMnO3, which are assigned to small particle size and single domain character of the particles, which are characterized by two well-defined anomalies, both connected with the spin inversion phenomena: one at low fields showing increasing and decreasing branches intersecting each other; another at high fields revealing sudden jumps. The study of a Schottky anomaly in the specific heat measurements recorded at low temperatures (below 10 K) under DC magnetic fields (in the range 5–14 T), is consistent with the presence of a field-driven spin reorientation, from antiferromagnetic to a net ferromagnetic order.

更新日期：2020-12-01

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