تقرير
Hyperbolic Bloch points in ferrimagnetic exchange spring
| العنوان: | Hyperbolic Bloch points in ferrimagnetic exchange spring |
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| المؤلفون: | Hermosa-Muñoz, Javier, Hierro-Rodríguez, Aurelio, Sorrentino, Andrea, Martín, José I., Alvarez-Prado, Luis M., Pereiro, Eva, Quirós, Carlos, Velez, María, Ferrer, Salvador |
| المصدر: | Results in Physics, Volume 61 (2024) 107771 |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | Bloch points in magnetic materials are attractive entities in view of magnetic information transport. Here, Bloch point configuration has been investigated and experimentally determined in a magnetic trilayer ($Gd_{12}Co_{88}/Nd_{17}Co_{83}/Gd_{24}Co_{76}$) with carefully adjusted composition within the ferrimagnetic $Gd_{x}Co_{1-x}$ alloys in order to engineer saturation magnetization, exchange length, and interlayer couplings (ferromagnetic vs antiferromagnetic). X-ray vector magnetic tomography has allowed us to determine experimentally Bloch point polarity (related to topological charge) and Bloch point helicity ${\gamma}$ (determined by magnetostatic energy). At the bottom layer (close to the ferromagnetic interface), Bloch points adopt a standard circulating configuration with helicity ${\gamma}$ close to ${\pi}/2$. Within the top layer (with much lower saturation magnetization), Bloch points nucleate within a Neel-like exchange spring domain wall created by the antiferromagnetic coupling and adopt an uncommon hyperbolic configuration, characterized by much larger helicity angles. Our results indicate a path for Bloch point engineering in future applications adjusting material parameters and domain wall characteristics. Comment: 17 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.rinp.2024.107771 |
| URL الوصول: | http://arxiv.org/abs/2312.09836 |
| رقم الأكسشن: | edsarx.2312.09836 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.rinp.2024.107771 |
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