Mössbauer measurements of GaFeO3 single crystal multiferroic

Abstract

Mössbauer measurements on single crystal absorbers at room and at low temperatures were performed. The results are fully consistent with previously published reports by other groups. Spectra of single crystals were simultaneously analyzed including magnetic dipole and electric quadrupole interactions. The analysis shows that there is a small component of magnetic moments perpendicular to the magnetic easy axis. Mössbauer data seem not agree with commonly accepted ferrimagnetic structure of GaFeO3.

Electrical polarization switching in bulk single-crystal GaFeO3

“…Crystals were grown at the rate of 3-5 mm/h, with feed and seed rods rotated at 15 rpm in the opposite directions. The growth direction was enforced using oriented GaFeO 3 seeds in the a or c crystallographic direction [22,23]. The misorientation of growth directions with respect to the crystalline directions is listed in Table I.…”

“…Details of the Mössbauer experiment are given in [23]. The single crystals grown in the a and in c directions (Table I) were used for the preparation of single-crystalline, oriented absorbers.…”

“…Using electronic structure calculations on ideal GaFeO 3 and on single Fe cations at Ga sites, we obtained electric field gradients on the 57 Fe probe at cationic sites (Table III). With the help of the full Hamiltonian formalism [38] adapted to the GaFeO 3 crystal [23], we have calculated parameters of doublets for the 57 Fe iron probe at different sites and orientations of the k vector (Table IV).…”