Charge ordering, ferroelectric, and magnetic domains in LuFe2O4 observed by scanning probe microscopy
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- Charge ordering, ferroelectric, and magnetic domains in LuFe2O4 observed by scanning probe microscopy
- Yang I.K.; Jeehoon Kim; Lee S.H.; Cheong S.-W.; Jeong Y.H.
- APPLIED PHYSICS LETTERS, v.106, no.15, pp.152902-1 - 152902-5
- AMER INST PHYSICS
- LuFe2O4 is a multiferroic system which exhibits charge order, ferroelectricity, and ferrimagnetism
simultaneously below 230 K. The ferroelectric/charge order domains of LuFe2O4 are imaged
with both piezoresponse force microscopy (PFM) and electrostatic force microscopy (EFM), while
the magnetic domains are characterized by magnetic force microscopy (MFM). Comparison of
PFM and EFM results suggests that the proposed ferroelectricity in LuFe2O4 is not of usual
displacive type but of electronic origin. Simultaneous characterization of ferroelectric/charge order
and magnetic domains by EFM and MFM, respectively, on the same surface of LuFe2O4 reveals
that both domains have irregular patterns of similar shape, but the length scales are quite different.
The domain size is approximately 100 nm for the ferroelectric domains, while the magnetic domain
size is much larger and gets as large as 1 lm. We also demonstrate that the origin of the formation
of irregular domains in LuFe2O4 is not extrinsic but intrinsic.
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