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Resistance‐Chiral Anisotropy of Chiral Mesostructured Half‐metallic Fe 3 O 4 Films
Author(s) -
Bai Te,
Ai Jing,
Ma Jie,
Duan Yingying,
Han Lu,
Jiang Jingang,
Che Shunai
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202108142
Subject(s) - chirality (physics) , metal , anisotropy , materials science , condensed matter physics , crystal structure , crystallography , chemistry , symmetry breaking , chiral symmetry breaking , physics , optics , quantum mechanics , nambu–jona lasinio model , metallurgy
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 Fe 3 O 4 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.