Premium
The absence of exchange bias with (001)‐oriented tetragonal‐like BiFeO 3 films
Author(s) -
Xu Qingyu,
Yuan Xueyong,
Xue Xiaobo,
Shi Zhong,
Wen Zheng,
Du Jun
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350079
Subject(s) - materials science , tetragonal crystal system , exchange bias , antiferromagnetism , ferromagnetism , monoclinic crystal system , coercivity , bilayer , condensed matter physics , phase (matter) , layer (electronics) , nanotechnology , crystallography , magnetic field , magnetic anisotropy , magnetization , crystal structure , chemistry , membrane , physics , biochemistry , organic chemistry , quantum mechanics
Single‐phase tetragonal‐like BiFeO 3 (T‐BFO) films with thickness up to 480 nm have been successfully prepared on (001) LaAlO 3 substrates using NdAlO 3 (NAO) as a buffer layer. The monoclinic distortion increases on increasing the thickness of T‐BFO films. Negligible small exchange bias field ( H E ) (<8 Oe) has been observed in T‐BFO/NiFe bilayers. The insertion of a 2‐nm thick La 0.67 Sr 0.33 MnO 3 (LSMO) film between NAO and BFO can keep the structure of single‐phase T‐BFO. Strongly enhanced H E and coercivity has been observed below 100 K in LSMO/T‐BFO bilayer, which has been attributed to the phase separation and coexistence of antiferromagnetic and ferromagnetic phases in the ultrathin LSMO layer due to the compressive strain exerted by the NAO buffer layer. Our results clearly demonstrate that T‐BFO cannot provide an effective exchange bias field on the adjacent ferromagnetic layer, and the possible explanation has been provided.