Resistance‐Chiral Anisotropy of Chiral Mesostructured Half‐metallic Fe 3 O 4 Films
| Autor: | Lu Han, Jie Ma, Jing Ai, Shunai Che, Jingang Jiang, Yingying Duan, Te Bai |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Quantitative Biology::Biomolecules
Materials science Condensed matter physics Spin polarization High Energy Physics::Lattice Stacking General Chemistry Crystal structure Catalysis Metal Electrical resistivity and conductivity visual_art visual_art.visual_art_medium Half-metal Chirality (chemistry) Anisotropy |
| Zdroj: | Angewandte Chemie International Edition. 60:20036-20041 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | Half-metallic materials are theoretically predicted to be metallic and insulating, which have not been confirmed experimentally, and the predictions are still in doubt. We report the resistance-chiral anisotropy (R-ChA), i.e., chirality-dependent electrical conductivity, in chiral mesostructured Fe3 O4 films (CMFFs) grown on the substrates via a hydrothermal method using amino acids as symmetry-breaking agents. Two levels of chirality exist in the CMFFs: primary distortion of the crystal lattice forms twisted nanoflakes, and secondary helical stacking of nanoflakes forms fan-shaped nanoplates. At temperatures below 30 K, the CMFFs exhibited metallic conductivity and insulation for one handedness and the other, respectively. The chirality-dependent effective magnetic fields were speculated to stabilize the opposite spin in the antipodal chiral frame, which led to the free transport of electrons in one handedness of the chiral structure and immobility for the other handedness. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text