Real-space observation of nanoscale magnetic phase separation in dysprosium by aberration-corrected Lorentz microscopy. Nagai, T., Kimoto, K., Inoke, K., & Takeguchi, M. Physical Review B, 96(10):100405, September, 2017.
Real-space observation of nanoscale magnetic phase separation in dysprosium by aberration-corrected Lorentz microscopy [link]Paper  doi  abstract   bibtex   
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 ∼100K, and the two nanoscale phases coexisted up to ∼140K. 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 the in situ observation 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 from ∼6 to ∼11kOe. It was proven that the boundaries between these nanoscale coexisting phases were perpendicular to the z axis, which is the rotation axis common to the modulated magnetic structures.
@article{nagai_real-space_2017-1,
	title = {Real-space observation of nanoscale magnetic phase separation in dysprosium by aberration-corrected {Lorentz} microscopy},
	volume = {96},
	url = {https://link.aps.org/doi/10.1103/PhysRevB.96.100405},
	doi = {10.1103/PhysRevB.96.100405},
	abstract = {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 ∼100K, and the two nanoscale phases coexisted up to ∼140K. 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 the in situ observation 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 from ∼6 to ∼11kOe. It was proven that the boundaries between these nanoscale coexisting phases were perpendicular to the z axis, which is the rotation axis common to the modulated magnetic structures.},
	number = {10},
	urldate = {2018-02-07},
	journal = {Physical Review B},
	author = {Nagai, Takuro and Kimoto, Koji and Inoke, Koji and Takeguchi, Masaki},
	month = sep,
	year = {2017},
	pages = {100405},
}

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