...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskite Bi_(0.8)La_(0.2)Fe_(0.5)Mn_(0.5)O_3
【24h】

Spin-cycloid instability as the origin of weak ferromagnetism in the disordered perovskite Bi_(0.8)La_(0.2)Fe_(0.5)Mn_(0.5)O_3

机译：自旋摆线不稳定性是无序钙钛矿Bi_（0.8）La_（0.2）Fe_（0.5）Mn_（0.5）O_3中弱铁磁性的起源

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Powder neutron diffraction and magnetometry studies have been conducted to investigate the crystallographic and magnetic structure of Bi_(0.8)La_(0.2)Fe_(0.5)Mn_(0.5)O_3. The compound stabilizes in the Imma orthorhombic crystal symmetry in the measured temperature range of 5 to 380 K, with a transition to antiferromagnetic order at T_N ≈ 240 K. The spin cycloid present for BiFeO_3 is found to be absent with 50% Mn~(3+) cation substitution, leading to G-type antiferromagnetic order with an enhanced out-of-plane canted ferromagnetic component, evident from measurable weak-ferromagnetic hysteresis. Structural modifications do not solely explain this behavior, indicating that modified electron exchange interactions must be taken into account. A classical spin simulation was developed to investigate the effect of random substitution in a disordered pseudocubic perovskite. The calculations took into account the nearest-neighbor, next-nearest-neighbor, and Dzyaloshinskii-Moriya interactions, along with the local spin anisotropy. Using this framework to extend the established Hamiltonian model for BiFeO_3, we show that only certain types of perturbations at a magnetic defect and the surrounding molecular fields trigger a simultaneous collapse of cycloidal order and the emergence of the long-range weak-ferromagnetic component. By adopting values for the Mn molecular fields appropriate for REMnO_3 (RE = rare earth), simulations of BiMn_(0.5)Fe_(0.5)O_3 exhibit the key magnetic properties of our experimental observations.
机译：已经进行了粉末中子衍射和磁力测定研究，以研究Bi_（0.8）La_（0.2）Fe_（0.5）Mn_（0.5）O_3的晶体学和磁性结构。该化合物在5至380 K的测量温度范围内稳定于Imma正交晶体对称性，在T_N≈240 K时转变为反铁磁有序。发现BiFeO_3所存在的自旋摆线体中不存在50％Mn〜（3 +）阳离子取代，导致G型反铁磁顺序具有增强的平面外倾斜铁磁成分，这从可测量的弱铁磁滞后可以明显看出。结构修饰并不能完全解释这种行为，表明必须考虑修饰的电子交换相互作用。开发了经典的自旋模拟来研究无序伪立方钙钛矿中随机取代的影响。该计算考虑了最近邻，次近邻和Dzyaloshinskii-Moriya相互作用以及局部自旋各向异性。使用此框架扩展已建立的BiFeO_3的哈密顿量模型，我们表明，在磁缺陷和周围分子场处只有某些类型的扰动会触发摆线序同时崩溃和长距离弱铁磁分量的出现。通过采用适合于REMnO_3（RE =稀土）的Mn分子场的值，BiMn_（0.5）Fe_（0.5）O_3的模拟显示了我们实验观察的关键磁性。

著录项

  • 来源
    《Physical review》 |2014年第14期|144422.1-144422.11|共11页
  • 作者

    J. Beitinshaw; D. L. Cortie; Z. X. Cheng; M. Avdeev; A. J. Studer; F. Klose; C. Ulrich; X. L. Wang;

  • 作者单位

    School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia,Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    The Institute for Superconducting and Electronic Materials, The University of Wollongong, Wollongong, NSW, 2522, Australia,Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    The Institute for Superconducting and Electronic Materials, The University of Wollongong, Wollongong, NSW, 2522, Australia;

    Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia,Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;

    The Institute for Superconducting and Electronic Materials, The University of Wollongong, Wollongong, NSW, 2522, Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号