Giant coercivity nanodots and fractals in CoPt films grown on (001) Sr Ti O 3 using pulsed laser deposition
High coercivity nanoscale structures of CoPt are grown on (001) Si Ti O 3 with pulsed laser ablation. At low growth rate ( ≃ 0.4 Å ∕ s ) , the film morphology changes from a self-similar fractal to nanodots as the deposition temperature is raised from 700 to 800 ° C . While the nanodots are L 1 0 or...
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| Published in: | Applied physics letters Vol. 89; no. 20; pp. 202511 - 202511-3 |
|---|---|
| Main Authors: | , , , |
| Format: | Journal Article |
| Published: |
American Institute of Physics
15-11-2006
|
| Online Access: | Get full text |
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| Summary: | High coercivity nanoscale structures of CoPt are grown on (001)
Si
Ti
O
3
with pulsed laser ablation. At low growth rate
(
≃
0.4
Å
∕
s
)
, the film morphology changes from a self-similar fractal to nanodots as the deposition temperature is raised from
700
to
800
°
C
. While the nanodots are
L
1
0
ordered phase with out-of-plane
c
axis and coercivity
H
c
⊥
≃
30
kOe
, the fractals have a nonzero, in-plane
c
-axis component of the
L
1
0
phase. The large lattice mismatch between (001)
Sr
Ti
O
3
and the
a
c
∕
b
c
plane of
L
1
0
imparts tensile strain to the films whose morphological manifestations can be suppressed at high growth rates. |
|---|---|
| ISSN: | 0003-6951 1077-3118 |
| DOI: | 10.1063/1.2388859 |