Data for: Magnetic-field-assisted molecular beam epitaxy: Engineering of Fe3O4 ultrathin films on MgO(111)

Conversion electron Moessbauer spectra (CEMS) were collected for ultrathin magnetite films. Data are the source spectra presented in Figs 3 and 4: Fig 3a ba_Fe3O4_1_graze.txt : Source data to Fig. 3a. CEMS spectrum of a 100 Å magnetite film measured in situ under ultrahigh vacuum.Fig 3b BA_Fe3O4_1_512.txt: Source data to Fig. 3b. CEMS spectrum of a 100 Å magnetite film measured ex situ after one months after exposure to the atmosphereFig 3c BA_Fe3O4_1_XII_2022.txt: Source data to Fig. 3c. CEMS spectrum of a 100 Å magnetite film measured ex situ, after six months after exposure to the atmosphere. Fig 4b ba_Fe3O4_5_bez_pola_512.txt: Source data to Fig. 4b. CEMS spectrum for the 10 nm Fe3O4(111) film on MgO(111) deposited with no-field.Fig 4c ba_fe3o4__6_512.txt: Source data to Fig. 4c. CEMS spectrum for the 10 nm Fe3O4(111) film on MgO(111) deposited in-field.