Composition-, temperature-, and field- driven magnetic phase transitions in Bi0.9Ca0.1Fe1-xMnxO3 multiferroics

IF 2.5 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
V.A. Khomchenko, M. Das, J.A. Paixão
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Abstract

A magnetometric study of Bi0.9Ca0.1Fe1-xMnxO3 (0.3 ≤ x ≤ 0.5) compounds was conducted over broad temperature and field ranges to clarify the impact of Mn substitution on the magnetic properties of Ca2+-doped bismuth ferrite-based multiferroics near the polar-antipolar phase boundary. Room-temperature X-ray diffraction measurements confirm the stability of the polar rhombohedral R3c structure up to x = 0.4, with a transition to the antipolar orthorhombic Pnam phase occurring through a mixed structural state at x≈ 0.45. Magnetic measurements of rhombohedral-structure samples reveal an evolution in magnetization behavior, indicative of a transformation from the cycloidal spin order, characteristic of low-doped bismuth ferrites, to a collinear antiferromagnetic arrangement as Mn content increases. Magnetic field modifies the collinear antiferromagnetic structure towards a canted antiferromagnetic one. The threshold field for the metamagnetic transformation decreases with decreasing temperature and increasing Mn concentration.
Bi0.9Ca0.1Fe1-xMnxO3多铁质中成分、温度和场驱动的磁相变
在较宽的温度和场范围内对Bi0.9Ca0.1Fe1-xMnxO3(0.3≤x≤0.5)化合物进行了磁强学研究,以阐明Mn取代对Ca2+掺杂铋铁氧体基多铁氧体在极性-反极性相边界附近的磁性能的影响。室温x射线衍射测量证实了极性菱形R3c结构在x = 0.4时的稳定性,并在x≈0.45时通过混合结构态过渡到反极性正交Pnam相。菱形结构样品的磁性测量揭示了磁化行为的演变,表明随着Mn含量的增加,从摆线自旋顺序(低掺杂铋铁氧体的特征)转变为共线反铁磁排列。磁场将共线反铁磁结构改变为倾斜反铁磁结构。随着温度的降低和Mn浓度的增加,变磁场的阈值场逐渐减小。
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来源期刊
Journal of Magnetism and Magnetic Materials
Journal of Magnetism and Magnetic Materials 物理-材料科学:综合
CiteScore
5.30
自引率
11.10%
发文量
1149
审稿时长
59 days
期刊介绍: The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.
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