Jonker, G.H., Van Santen, J.H., Physica (Utrecht) 16, 337,1950.

1
(No Transcript)
2
??????? ????? ?????? ??????? ?????
???? ? ?????? ??? ??????? ?? ?? ???? ????????
????????? ???????? ? ???????????? ??????? ???
?????????
?????????? ???????? ???? ????? ???? ????
???? ?????
????? ?????? ???? ????? ????? 1387
3
????? ?????
????? ??????? ??
??? ????? ??????
??? ??? - ???
???????????? ? ????? ??
??????? ?? ? ??? ????
????? ?????? ???? ??
????? ????? ? ???? ????? ????
4
????? ??????? ??
???????
????? ????? ????? ???? ???????? ? ???????? 1950
Jonker, G.H., Van Santen, J.H., Physica (Utrecht)
16, 337,1950.
????? ??? ???? 1951
Zener, C., Phys. Rev. 82b, 403,1951.
????? CMR ? ?????? ???? 1994
Jin, S., Tiefel, T. H., Cormack, M. Mc.,
Fastnacht, R. A., Ramesh, R., and Chen, L. H.,
Science, 264 , 413, 1994 .
5
???? ???????? ? ????????
????? ?? ?? ?????? ???? ??????? ??.
6
??? ????? ??????
??? ? ??? ????? ?????? ??? ?? ??? ????? ?? ????
?????? ?? ????? ?? ??? ?????
??? ????? 5d23s4
??? ????? 3Mn 4d03s4
???? ????? 4Mn 3d03s4
La31-xSr2xMn31-xMn4xO2-3
7
??? ???- ???
8
???????????? ? ????? ??
????? ????????????
100
MR0
????? ????????????
5
Anisotropic Magnetoresistance (AMR)
49
????? ???? 2007
Giant Magnetoresistance (GMR)
50-40
Tuneling Magnetoresistance (TMR)
99/999999
Colossal Magnetoresistance (CMR)
40-20
Low Field Magnetoresistance (LFMR)
9
????? ??? ???? ?? TMR ? GMR
TMR
GMR
10
??? CMR
Jin, S., et al., Science, 264, 413, 1994.
11
?????? ??? ??? LFMR ?? ??? ??? ?????? ???? ?? ??
????? ???
Lopez M.A, Hueso, L.E, and Rivadulla, F,
Nanotechnology, 14, 212-219, 2003.
12
??????? ?? ? ??? ????
???? ???? ? ???????
?????? ???? ???????
?????? ???? ???? ????
???? ???? ???? ???? ?? ??????? ?? ???? ???? ????
????
Zhang, N, Weiping Ding, Dingyu Xing, and Youwei
Du, Phys. Rev. B,56,8138,1997.
13
??? ??? ?????? LFMR 1) ???? ???? ??????
???? ?? 2) ?????
14
????? ?????? ???? ?? ?? ?? ????? ???
(?)
(???)
(?)
(?)
Kameli, P, Salamati, H, and Aezami, A, J. Alloys
Compd, 100, 53914, 2006.
15
????? ???? ?? ????? ?????
?????? ????? ??????? ????? ???????? ?????
??????? ?????? ???? ??????? ????? ??????? ???
????? ?? ??????? ???? ???????? ??????? ??? ?
??? ???? ??????????
16
?? ?????
??? ?????
???) ?????? ??????? ?????? ?? ??? ?? ???? ?????
??? ????(a)? 5 x (b)? 10 x (c) ?
15 x(??????).
?) ???????????? ????? ??? ????(a)? 5 x (b)? 10
x (c) ?? ????? ??? ???????? 3/0-0 ???? ?? ????
86 ?????.
Yan, L., Journal of Applied Physics, 96, 3,
1568, 2004.
17
?? ?????
??? ?????
Kameli, P., Salameti, H., Eshraghi, M.,
Mohammadizadeh, M., J. Appl. Phys, 98, 43908,
2005.
18
????? ?????
????? PPS ?? ?????
???) ?????? ??????? ?????? ???????? ?? ??? ????
??? ????? ???
?) ????? ??????? MR ?? ??? ??? ???? ????? ???
Anurag Gaur, G.D. Varma., Solid State
Communications, 144, 138143(2007)
19
????? ?????? ???? ?? ??? ???? ???????? ? ????????
????? LaMnO3(LMO)
????? ????? ? ???? ????? ???? ?? ????? ??? ??????
????????? ???????? ? ???????????? ?????
La0.8Sr0.2MnO3/xLaMnO3
20
????? ?????? ???? ?? ??? ????? ??? LaMnO3 (LMO)
12000c
????
(??? ????? ???? ????)
?
????? ??????? ?????
????? ???? ? ???? ??????? ?????
????? ??????? ?????
???? ???? ????? ????? ?? ???? ??? ???? ??? ?????
12000c
??? ???? ? ???? ???
????? ????
21
????? ? ???
(?)
(???)
(?)
(?)
22
?????????? ???? LMO
48 ???? ???? ???? ???
23
La0.8Sr0.2MnO3 /xLaMnO3 ????? ???? ????? ???
10000c
13500c
(?)
(???)
?????? ????? ????? ???? ????? ??? /xLaMnO3
La0.8Sr0.2MnO3
24
????? ???? ???? ???? ????????? /xLaMnO3
La0.8Sr0.2MnO3
?????? ????? ?????????? (????????)
????? ???? ??????? ???? ?? ???? LSMO ? LMO
??????????? ???? ? ?????? ??????
?????? ???? ?????? ????? ?? ????
(???)????????? ??? ?????

(?)????????? ??? ????.
?) ????????? ?? 20 ???? ???????.
25
?????? SEM ????????? /xLaMnO3 La0.8Sr0.2MnO3
13500c
10000c
0
0
5µm
2µm
10
10
5µm
2µm
25
20
5µm
2µm
Kameli, P., Salamati, H., and Hakimi, M., J.
Alloys Compd, In Press, 2007.
26
????? ??????? ??? ????? ????????? ????????
????????? /xLaMnO3 La0.8Sr0.2MnO3 ?? ???
?????? ????? ???? ???????? ?? ?????? ???? ???????
???? ????????? ??? ?????
???? ???? ???? ?? ?????? ???? ??????? ??
????????? ??? ???? ?? ???? ???? ??????? ?? ???
?????
(???)????????? ??? ?????
(?)????????? ??? ????? 0 ? 20 ????
(?)????????? ??? ????
27
??????? ?????? ???????? ????????? /xLaMnO3
La0.8Sr0.2MnO3 ?? ???
???? ???? ???? ???? ? ? ??? ???????? ?? ??????
????? ???????
?????? ??????? ?????? ???????????? ?? ????? ????
LaMnO3 ?? ????? ?? ???? ???? ? ??????????
???? ?? ??? ?? ????? ?????? ????? ??? ??? ????
(?)????????? ??? ?????
(???)????????? ??? ????
28
??????? ???????????? ????????? /xLaMnO3
La0.8Sr0.2MnO3 ?? ???
?????? ???????????? ?? ???? ????? ?? ????? ??? ??
?? ?????? ???? ??????? ? ???? ?? ?????? ?????
????? ???????
?????? ?????? ?? ?????? ???? ? ????? ?? ????
?????????????? - ??????????? ???? ????????? ?????
??? ?? ???? ????
(???)????????? ??? ?????
(?)????????? ??? ????
?)????? ???????????? ?? ????? ?????
29
????? ? ??????????
???? ???? ??? ??????????? ? ?????????? ?? ???
????? ??? LMO ?????? ?????? ???????? ?
???? ?????? ?? ??? ??? ?????? ???? ?? ?? ?????
??? LMO
30
???? ???? ???? ???????? ? ?????? ????? ?????? ??
????????? La0.8Sr0.2MnO3/xLaMnO3 ?? ?????? ?????
?????
???? ???? ???? ???????? ?? ????????? ??????????
??? ?? ???? ????? ?? ?????? ???? ??????? ?????
???? ??????? ?? ??? ?????
?????? ???????????? ?? ???? ??????? ????? ???????
?? ????? ? ???? ???? ??????? ?????? ?? ?? ?? ???
?????
Kameli, P., Salamati, H., and Hakimi, M., J.
Alloys Compd, In Press, 2007.
31
?????? ????? ???
1 Kameli, P., Salamati, H., and Hakimi, M., J.
Alloys Compd, In Press, 2007.
2??????? ????? ?????? ????? ? ??????? ?????
????? ???? ???????? ????????? ???????? ?
???????????? ????? ??La0.8Sr0.2MnO3/xLaMnO3
??????? ???? ???? ?????? ???? ??????? ?????? ??
???? ???? ????? ? 1386.
3?????? ?? ?????? ?? ??????? ?? ??????? ??
?????? ???? ????????? ????????? ???????? ???????
???? ???? ????? ?????? 1387.