Antiferromagnetic transitions in tetragonal-like BiFeO3
| Title | Antiferromagnetic transitions in tetragonal-like BiFeO3 |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | MacDougall GJ, Christen HM, Siemons W, Biegalski MD, Zarestky JL, Liang S, Dagotto E, Nagler SE |
| Journal Title | Physical Review B |
| Volume | 85 |
| Pages | 100406 |
| Date Published | 03 |
| Type of Article | Article |
| ISBN Number | 1098-0121 |
| Accession Number | WOS:000301705500001 |
| Keywords | epitaxy, ferroelectricity, magnetism, neutron-diffraction, phases, polarization, room-temperature, strain, thin-films |
| Abstract | Recent studies have reported the existence of an epitaxially stabilized tetragonal-like ("T-like") monoclinic phase in BiFeO3 thin films with high levels of compressive strain. While their structural and ferroelectric properties are different from those of rhombohedral-like ("R-like") films with lower levels of strain, little information exists on magnetic properties. Here, we report on a detailed neutron scattering study of a nearly phase-pure film of T-like BiFeO3. By tracking the temperature dependence and relative intensity of several superstructure peaks in the reciprocal lattice cell, we confirm antiferromagnetism with largely G-type character and T-N = 324 K, significantly below a structural phase transition at 375 K, contrary to previous reports. Evidence for a second transition, possibly a minority magnetic phase with C-type character, is also reported with T-N = 260 K. The coexistence of the two magnetic phases in T-like BiFeO3 and the difference in ordering temperatures between R-like and T-like systems is explained through simple Fe-O-Fe bond distance considerations. |
| URL | <Go to ISI>://WOS:000301705500001 |
| DOI | 10.1103/PhysRevB.85.100406 |
| Alternate Journal | Phys. Rev. B |
