Coexistence of weak ferromagnetism and ferroelectricity in the high pressure LiNbO3-type phase of FeTiO3.
We report the magnetic and electrical characteristics of polycrystalline FeTiO_{3} synthesized at high pressure that is isostructural with acentric LiNbO_{3} (LBO). Piezoresponse force microscopy, optical second harmonic generation, and magnetometry demonstrate ferroelectricity at and below room temperature and weak ferromagnetism below approximately 120 K. These results validate symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism in a series of transition metal titanates crystallizing in the LBO structure.
Varga
T
T
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Kumar
A
A
Vlahos
E
E
Denev
S
S
Park
M
M
Hong
S
S
Sanehira
T
T
Wang
Y
Y
Fennie
C J
CJ
Streiffer
S K
SK
Ke
X
X
Schiffer
P
P
Gopalan
V
V
Mitchell
J F
JF