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Domain structure and reorientation in CoFe_2O_4

机译:CoFe_2O_4中的域结构和重新定向

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摘要

The microscopic processes underlying magnetostriction in ferrites were studied for the case of CoFe_2O_4 single crystals by high-resolution in situ x-ray diffraction and complementary magnetic microscopy techniques. The data support the reports of Yang and Ren [Phys. Rev. B 77, 014407 (2008)] that magnetostriction in these materials originates from the switching of crystallographic domains, similar to ferroelastic or ferroelectric domain switching, and reveals the presence of two coexisting tetragonal spinel structures, corresponding to domains of high and of low strain. The latter alternate in the crystal, separated by 90° domain boundaries, and can be explained by the effect of internal stress emerging during the transition into the ferrimagnetic phase. During magnetization of the sample two structural transitions are observed: a conversion of the transversal into axial domains at 1.95 kOe and a growth of the high-strain domains at the cost of the low-strain axial domains at 2.8 kOe. These microscopic changes are in good agreement with the macroscopic magnetization and magnetostriction behavior of CoFe_2O_4.
机译:通过高分辨率原位x射线衍射和互补磁镜技术研究了CoFe_2O_4单晶的铁素体磁致伸缩的微观过程。数据支持杨和任的报告。 Rev. B 77,014407(2008)],这些材料中的磁致伸缩起源于晶体学域的转换,类似于铁弹性或铁电域转换,并且揭示了两个共存的四方尖晶石结构的存在,分别对应于高和低域应变。后者在晶体中交替出现,由90°畴边界隔开,可以用过渡到亚铁磁性相期间出现的内部应力的作用来解释。在样品的磁化过程中,观察到两个结构过渡:在1.95 kOe处横向转变为轴向畴,在2.8 kOe处以低应变轴向畴为代价增加了高应变畴的生长。这些微观变化与CoFe_2O_4的宏观磁化和磁致伸缩行为非常吻合。

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  • 来源
    《Physical review》 |2016年第19期|195427.1-195427.7|共7页
  • 作者单位

    Institute for Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany,Department of Solid State Sciences, Ghent University, 9000 Ghent, Belgium;

    Institute for Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany;

    Institute for Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany;

    Institute for Materials Science, University of Kiel, D-24143 Kiel, Germany;

    Institute for Materials Science, University of Kiel, D-24143 Kiel, Germany;

    Institute for Materials Science, University of Kiel, D-24143 Kiel, Germany;

    Institute for Materials Science, University of Kiel, D-24143 Kiel, Germany;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China;

    XMaS, European Synchrotron Radiation Facility, F-38000 Grenoble, France,Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom;

    Institute for Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany,Ruprecht Haensel Laboratory, Kiel University, D-24098 Kiel, Germany;

    Institute for Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany,Ruprecht Haensel Laboratory, Kiel University, D-24098 Kiel, Germany;

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