Anisotropic magnetoresistance and spin polarization of La 0.7Sr0.3MnO3/SrTiO3 superlattices
Journal
Applied Physics Letters
Journal Volume
87
Journal Issue
17
Pages
1-3
Date Issued
2005
Author(s)
Guo, C.-C.
Abstract
The crystalline structure, anisotropic magnetoresistance (AMR), and magnetization of La0.7 Sr0.3 MnO3 SrTiO3 (LSMO/STO) superlattices grown by a rf sputtering system are systematically analyzed to study the spin polarization of manganite at interfaces. The presence of positive low-temperature AMR in LSMO/STO superlattices implies that two bands of majority and minority character contribute to the transport properties, leading to a reduced spin polarization. Furthermore, the magnetization of superlattices follows the T32 law and decays more quickly as the thickness ratio dSTO dLSMO increases, corresponding to a reduced exchange coupling. The results clearly show that the spin polarization is strongly correlated with the influence of interface-induced strain on the structure. © 2005 American Institute of Physics.
Type
journal article