中国物理B ›› 2013, Vol. 22 ›› Issue (4): 46101-046101.doi: 10.1088/1674-1056/22/4/046101

所属专题: TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research

• SPECIAL TOPIC --- Non-equilibrium phenomena in soft matters • 上一篇    下一篇

Structural changes concurrent with ferromagnetic transition

杨森a, 鲍慧新a, 周超a, 王宇a, 任晓兵a b, 宋晓平a, Yoshitaka Matsushitac, Yoshio Katsuyac, Masahiko Tanakac, Keisuke Kobayashic   

  1. a Frontier Institute of Science and Technology, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;
    b Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki, Japan;
    c National Institute for Materials Science, Beamline BL15XU, Spring-8, 1-1-1 Kohto, Sayo-cho, Hyogo 679-5148, Japan
  • 收稿日期:2013-02-26 出版日期:2013-03-01 发布日期:2013-03-01
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant No. 2012CB619401), the National Natural Science Foundation of China (Grant Nos. 51222104 and 51071117), and the Fundamental Research Funds for Central Universities.

Structural changes concurrent with ferromagnetic transition

Yang Sen (杨森)a, Bao Hui-Xin (鲍慧新)a, Zhou Chao (周超)a, Wang Yu (王宇)a, Ren Xiao-Bing (任晓兵)a b, Song Xiao-Ping (宋晓平)a, Yoshitaka Matsushitac, Yoshio Katsuyac, Masahiko Tanakac, Keisuke Kobayashic   

  1. a Frontier Institute of Science and Technology, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;
    b Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki, Japan;
    c National Institute for Materials Science, Beamline BL15XU, Spring-8, 1-1-1 Kohto, Sayo-cho, Hyogo 679-5148, Japan
  • Received:2013-02-26 Online:2013-03-01 Published:2013-03-01
  • Contact: Yang Sen E-mail:yang.sen@mail.xjtu.edu.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2012CB619401), the National Natural Science Foundation of China (Grant Nos. 51222104 and 51071117), and the Fundamental Research Funds for Central Universities.

摘要:

Ferromagnetic transition has generally been considered to involve only an ordering of magnetic moment with no change in the host crystal structure or symmetry, as evidenced by a wealth of crystal structure data from conventional X-ray diffractometry (XRD). However, the existence of magnetostriction in all known ferromagnetic systems indicates that the magnetic moment is coupled to the crystal lattice; hence there is a possibility that magnetic ordering may cause a change in crystal structure. With the development of high-resolution synchrotron XRD, more and more magnetic transitions have been found to be accompanied by simultaneous structural changes. In this article, we review our recent progress in understanding the structural change at a ferromagnetic transition, including synchrotron XRD evidence of structural changes at the ferromagnetic transition, a phenomenological theory of crystal structure changes accompanying ferromagnetic transitions, new insight into magnetic morphotropic phase boundaries (MPB) and so on. Two intriguing implications of non-centric symmetry in the ferromagnetic phase and the first-order nature of ferromagnetic transition are also discussed here. In short, this review is intended to give a self-consistent and logical account of structural change occurring simultaneously with a ferromagnetic transition, which may provide new insight for developing highly magneto-responsive materials.

关键词: ferromagnetic transition, crystal structure, morphotropic phase boundary (MPB), magnetostriction, multiferroicity

Abstract:

Ferromagnetic transition has generally been considered to involve only an ordering of magnetic moment with no change in the host crystal structure or symmetry, as evidenced by a wealth of crystal structure data from conventional X-ray diffractometry (XRD). However, the existence of magnetostriction in all known ferromagnetic systems indicates that the magnetic moment is coupled to the crystal lattice; hence there is a possibility that magnetic ordering may cause a change in crystal structure. With the development of high-resolution synchrotron XRD, more and more magnetic transitions have been found to be accompanied by simultaneous structural changes. In this article, we review our recent progress in understanding the structural change at a ferromagnetic transition, including synchrotron XRD evidence of structural changes at the ferromagnetic transition, a phenomenological theory of crystal structure changes accompanying ferromagnetic transitions, new insight into magnetic morphotropic phase boundaries (MPB) and so on. Two intriguing implications of non-centric symmetry in the ferromagnetic phase and the first-order nature of ferromagnetic transition are also discussed here. In short, this review is intended to give a self-consistent and logical account of structural change occurring simultaneously with a ferromagnetic transition, which may provide new insight for developing highly magneto-responsive materials.

Key words: ferromagnetic transition, crystal structure, morphotropic phase boundary (MPB), magnetostriction, multiferroicity

中图分类号:  (X-ray diffraction and scattering)

  • 61.05.C-
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 75.10.-b (General theory and models of magnetic ordering) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))