TY - JOUR
T1 - Control of grain size by initial growth stage of YBCO thin films
AU - Mukaida, Masashi
AU - Sato, S.
AU - Takano, Y.
AU - Kusunoki, M.
AU - Ohshima, S.
PY - 2002/10/1
Y1 - 2002/10/1
N2 -
A grain size control technology will be described. YBa
2
Cu
3
O
7-δ
thin films are grown by a pulsed laser deposition method in 400 mTorr oxygen atmosphere. The films are grown by a self-template method with various self-template growth temperatures. However the temperature of the main YBa
2
Cu
3
O
7-δ
layer was fixed. Grain size of YBa
2
Cu
3
O
7-δ
thin films on MgO substrates are observed by atomic force microscope. Mean diameter of grains are calculated by the number of grains in scanned area of 1 × 1 μm
2
. The mean diameters are 2.49 × 10
2
, 2.89 × 10
2
, 4.047 × 10
2
and 4.192 × 10
2
nm for films with an initial layer growth temperature of 670, 690, 714 and 730 °C, respectively. Grain size is found to depend on the initial growth stage of the YBa
2
Cu
3
O
7-δ
thin film growth. These grain sizes have a strong relationship with the inverse of substrate temperature indicating thermally excited migration of YBa
2
Cu
3
O
7-δ
nuclei. It is also clarified that migration length of YBa
2
Cu
3
O
7-δ
nucleus is longer on an YBa
2
Cu
3
O
7-δ
films than on MgO substrates.
AB -
A grain size control technology will be described. YBa
2
Cu
3
O
7-δ
thin films are grown by a pulsed laser deposition method in 400 mTorr oxygen atmosphere. The films are grown by a self-template method with various self-template growth temperatures. However the temperature of the main YBa
2
Cu
3
O
7-δ
layer was fixed. Grain size of YBa
2
Cu
3
O
7-δ
thin films on MgO substrates are observed by atomic force microscope. Mean diameter of grains are calculated by the number of grains in scanned area of 1 × 1 μm
2
. The mean diameters are 2.49 × 10
2
, 2.89 × 10
2
, 4.047 × 10
2
and 4.192 × 10
2
nm for films with an initial layer growth temperature of 670, 690, 714 and 730 °C, respectively. Grain size is found to depend on the initial growth stage of the YBa
2
Cu
3
O
7-δ
thin film growth. These grain sizes have a strong relationship with the inverse of substrate temperature indicating thermally excited migration of YBa
2
Cu
3
O
7-δ
nuclei. It is also clarified that migration length of YBa
2
Cu
3
O
7-δ
nucleus is longer on an YBa
2
Cu
3
O
7-δ
films than on MgO substrates.
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U2 - 10.1016/S0921-4534(02)01697-0
DO - 10.1016/S0921-4534(02)01697-0
M3 - Article
AN - SCOPUS:4644246737
SN - 0921-4534
VL - 378-381
SP - 1232
EP - 1235
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 2
ER -