Open AccessMagnetic structure and phase transition at the surface region of Fe3O4(100)
Author(s) -
Taizo Kawauchi,
Yoshio Miura,
Kenichi Asakawa,
Katsuyuki Fukutani
Publication year - 2020
Publication title -
journal of physics communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.407
H-Index - 17
ISSN - 2399-6528
DOI - 10.1088/2399-6528/abc8da
Subject(s) - magnetization , condensed matter physics , magnetic structure , phase transition , plane (geometry) , octahedron , materials science , conversion electron mössbauer spectroscopy , mössbauer spectroscopy , phase (matter) , surface (topology) , crystallography , mössbauer effect , chemistry , crystal structure , magnetic field , physics , geometry , mathematics , organic chemistry , quantum mechanics
The magnetic structure and phase transition of the near-surface region of Fe 3 O 4 (100) was investigated by 57 Fe conversion electron Mössbauer spectroscopy (CEMS) and theoretical calculations. It is revealed that at 300 K the magnetization is in-plane in the surface region and cants from the in-plane to the 〈111〉 direction in a deeper region suggesting the presence of a noncollinear magnetic structure. The critical exponents for the tetrahedral and octahedral sites are estimated to be 0.24 ± 0.01 and 0.28 ± 0.01, respectively. Near the critical temperature, furthermore, the magnetization direction in the surface region was found to deviate from the in-plane direction.