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Negative magnetization in the zero field-cooled and exchange-bias effect in Cu-doped PrCrO3
Journal of Materials Science: Materials in Electronics ( IF 2.8 ) Pub Date : 2021-09-07 , DOI: 10.1007/s10854-021-06926-y
L. F. Mendivil 1 , J. Alvarado-Rivera 2 , G. Tavizón 3 , E. Verdín 4 , J. Arenas-Alatorre 5 , A. Durán 6
Affiliation  

High-quality nanometric and homogeneous particles of Cu–doped PrCrO3 ceramic compounds were synthesized by the hydrothermal-assisted sol–gel method. Structural, chemical state, morphology, and magnetic properties were investigated in the PrCr1−xCuxO3 orthochromite with 0 ≤ x ≤ 0.1 composition. XRD patterns show a complete solubility of the Cu ion, as well as an increase of the orthorhombic cell volume. The microstructural analysis (SEM) shows that the nanometric-size particles obtained from the synthesis process coalesce during the subsequent high-temperature process. In addition, XPS analysis revealed that the solubility and charge compensations by aliovalent Cu2+ ions substitution are driven by the change of the oxidation state from Cr3+ to Cr5+ and Cr6+. These results produce novel changes in the magnetic properties. There, the ZFC-mode shows negative magnetization in all investigated samples, and it is discussed as an intrinsic phenomenon in terms of the Γ2 (Fx, Cy, Gz) spin configuration as well as the arising of the diamagnetic Cr6+ (do). It is noted that Cr6+ tunes the diamagnetic magnitude during the ZFC protocol. On the other hand, different oxidation states are observed at the Cr site in PrCrO3, whose final result is an increase of the coercivity field, Hc, and the remanent magnetization, Mr, in the MH curves. The increase of ferromagnetic and the antiferromagnetic domains sharing the same volume leads to an anisotropic magnetic interaction, called exchange-bias effect. It is observed that the Cu-doped PrCrO3 decreases the exchange-bias effect, but at the same time an increase in the magnetic properties is observed at 2 K.



中文翻译:

Cu掺杂PrCrO3中零场冷和交换偏置效应中的负磁化

通过水热辅助溶胶-凝胶法合成了高质量的纳米级均匀颗粒 Cu 掺杂的 PrCrO 3陶瓷化合物。研究了成分为 0 ≤ x ≤ 0.1的 PrCr 1- x Cu x O 3正铬铁矿的结构、化学状态、形态和磁性。XRD 图案显示 Cu 离子完全溶解,以及斜方晶胞体积增加。微观结构分析 (SEM) 表明,从合成过程中获得的纳米级颗粒在随后的高温过程中聚结。此外,XPS 分析表明,异价 Cu 2+的溶解度和电荷补偿离子取代是由氧化态从 Cr 3+到 Cr 5+和 Cr 6+的变化驱动的。这些结果在磁性方面产生了新的变化。在那里,ZFC 模式在所有研究的样品中都显示出负磁化强度,并且根据Γ 2 ( F x , C y , G z ) 自旋配置以及抗磁性 Cr 6的出现将其作为固有现象进行了讨论+ ( d o )。注意到 Cr 6+在 ZFC 协议期间调整抗磁幅度。另一方面,在 PrCrO 3的 Cr 位点观察到不同的氧化态,其最终结果是矫顽力场 Hc 和M - H曲线中的剩磁Mr 增加。共享相同体积的铁磁畴和反铁磁畴的增加导致各向异性磁相互作用,称为交换偏置效应。观察到Cu掺杂的PrCrO 3降低了交换偏置效应,但同时在2 K下观察到磁性能增加。

更新日期:2021-09-08
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