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- Title
Spin-polarized inter-grain tunneling as the probable mechanism for low-field magnetoresistance in partially crystallized La[sub 0.5] Sr[sub 0.5] MnO[sub 3] thin films.
- Authors
Liu, J.-M.; Yuan, G.L.; Chen, X.Y.; Liu, Z.G.; Du, Y.W.; Huang, Q.; Li, J.; Xu, S.Y.; Ong, C.K.
- Abstract
Amorphous/crystalline mixed La[sub 0.5] Sr[sub 0.5] MnO[sub 3] (LSMO) thin films on quartz wafers are prepared at different depositing temperatures using laser ablation and their low-field magnetoresistive property is investigated. It is argued that the insulating amorphous layers separating the magnetic microcrystalline grains may act as the barriers for electron tunneling. The rapid decay of magnetoresistance with increasing temperature is explained by the spin-polarized inter-grain tunneling. Given the spin-polarized inter-grain tunneling as the probable mechanism, it is believed that the spin flip during inter-grain tunneling reaches a minimum at the optimized depositing temperature of 600 °C and consequently the maximal low-field magnetoresistance is obtained.
- Subjects
THIN films; LASER ablation; CRYSTALLIZATION; MAGNETORESISTANCE
- Publication
Applied Physics A: Materials Science & Processing, 2001, Vol 73, Issue 5, p625
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s003390100823