“…Magnetite (Fe 3 O 4 ) is regarded as a candidate in spintronic devices, which attracts much attention due to its magnetic and electronic properties including ferrimagnetism and half-metallicity. − In epitaxial Fe 3 O 4 films, the stacking fault generates widely distributed antiphase boundaries (APBs), where Fe A -O-Fe A and Fe B –O–Fe B are antiferromagnetic coupled. − Such abnormal magnetic interaction enlarging the magnitude of MR in Fe 3 O 4 films suggests the sensitivity of physical properties in Fe 3 O 4 to the local lattice structure. ,− What is more, as the temperature decreases to about 120 K ( T V ), Fe 3 O 4 undergoes Verwey transition. − The metastable lattice structure and magnetic properties of Fe 3 O 4 in the vicinity of T V are susceptible to lattice strain, stoichiometry, and thickness. ,, When considering the introduction of GB, the producing effects of the unique lattice structure at GBs on the electronic structure, transport, magnetic properties and Verwey transition in Fe 3 O 4 bicrystal films are not reported yet.…”