Real-space observation of nanoscale magnetic phase separation in dysprosium by aberration-corrected Lorentz microscopy
Real-space observation of nanoscale magnetic phase separation in dysprosium by aberration-corrected Lorentz microscopy
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通过像差校正洛伦兹显微镜对镝中纳米级磁相分离的实空间观察
DOI：
10.1103/physrevb.96.100405
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and Masaki Takeguchi
中科院分区：
文献类型：
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作者：
Takuro Nagai;Koji Kimoto;Koji Inoke;and Masaki Takeguchi
用像差校正洛伦兹显微镜研究了单晶镝在97-187K温度下的磁相分离。高分辨率洛伦兹显微镜结合强度输运方程方法成功地显示了共存磁相的面内磁化强度分布。观察到了从铁磁(FM)相到螺旋反铁磁(HAFM)相的相变，这两个纳米级的相共存到。在130K左右，FM相的体积分数随着温度的升高而减小，最终形成静磁孤子，它们是FM相的单个孤立磁区。我们还在142K时，通过施加垂直于螺旋轴的外加磁场对HAFM相进行了现场观测。随场强的增加，出现了扭曲的HAFM相，随后HAFM相和扇形相之间发生了纳米尺度的相分离。结果表明，这些纳米尺度的共存相之间的边界垂直于调制磁结构所共有的旋转轴。
Magnetic phase separation in single-crystal dysprosium at 97–187 K was investigated using aberration-corrected Lorentz microscopy. The high-resolution Lorentz microscopy combined with the transport-of-intensity equation method successfully visualized the in-plane magnetization distribution of the coexisting magnetic phases. The onset of a phase transition from the ferromagnetic (FM) phase to helical antiferromagnetic (HAFM) phase was observed at, and the two nanoscale phases coexisted up to. The volume fraction of the FM phase decreased with increasing temperature, eventually resulting in the formation of static magnetic solitons, which are isolated single domains of the FM phase, at around 130 K. We also performed thein situobservation of the HAFM phase at 142 K by applying an external magnetic field normal to the helical axis. With increasing field, a distorted HAFM phase emerged and the nanoscale phase separation between the HAFM phase and the fan phase subsequently occurred fromto. It was proven that the boundaries between these nanoscale coexisting phases were perpendicular to theaxis, which is the rotation axis common to the modulated magnetic structures.