Abstract
The experimentally measured coercive electric fields for domain reversal in ferroelectrics are typically many orders of magnitude lower than the estimates from phenomenological free-energy theory. This letter specifically investigates the influence of polarization gradients at pre-existing 180° domain walls in ferroelectrics on coercive fields for domain wall motion. It is shown that the ratio of theoretical coercive field without and with a preexisting domain wall is directly proportional to the ratio xo/a, where a is the lattice parameter and 2xo is the polarization wall width. This factor is 7.5-45 for a 20-120 nm wall width, the latter width determined here as the experimental upper limit for polarization wall width in lithium tantalate.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2740-2742 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 80 |
| Issue number | 15 |
| DOIs | |
| State | Published - Apr 15 2002 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
Cite this
}
Coercive fields in ferroelectrics : A case study in lithium niobate and lithium tantalate. / Kim, Sungwon; Gopalan, Venkatraman; Gruverman, Alexei.
In: Applied Physics Letters, Vol. 80, No. 15, 15.04.2002, p. 2740-2742.Research output: Contribution to journal › Article
TY - JOUR
T1 - Coercive fields in ferroelectrics
T2 - A case study in lithium niobate and lithium tantalate
AU - Kim, Sungwon
AU - Gopalan, Venkatraman
AU - Gruverman, Alexei
PY - 2002/4/15
Y1 - 2002/4/15
N2 - The experimentally measured coercive electric fields for domain reversal in ferroelectrics are typically many orders of magnitude lower than the estimates from phenomenological free-energy theory. This letter specifically investigates the influence of polarization gradients at pre-existing 180° domain walls in ferroelectrics on coercive fields for domain wall motion. It is shown that the ratio of theoretical coercive field without and with a preexisting domain wall is directly proportional to the ratio xo/a, where a is the lattice parameter and 2xo is the polarization wall width. This factor is 7.5-45 for a 20-120 nm wall width, the latter width determined here as the experimental upper limit for polarization wall width in lithium tantalate.
AB - The experimentally measured coercive electric fields for domain reversal in ferroelectrics are typically many orders of magnitude lower than the estimates from phenomenological free-energy theory. This letter specifically investigates the influence of polarization gradients at pre-existing 180° domain walls in ferroelectrics on coercive fields for domain wall motion. It is shown that the ratio of theoretical coercive field without and with a preexisting domain wall is directly proportional to the ratio xo/a, where a is the lattice parameter and 2xo is the polarization wall width. This factor is 7.5-45 for a 20-120 nm wall width, the latter width determined here as the experimental upper limit for polarization wall width in lithium tantalate.
UR - http://www.scopus.com/inward/record.url?scp=79955984373&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79955984373&partnerID=8YFLogxK
U2 - 10.1063/1.1470247
DO - 10.1063/1.1470247
M3 - Article
AN - SCOPUS:79955984373
VL - 80
SP - 2740
EP - 2742
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 15
ER -