Abstract
Epitaxial oxide trilayer junctions composed of magnetite () and doped manganite () exhibit inverse magnetoresistance as large as in fields of 4 kOe. The inverse magnetoresistance confirms the theoretically predicted negative spin polarization of . Transport through the barrier can be understood in terms of hopping transport through localized states that preserve electron spin information. The junction magnetoresistance versus temperature curve exhibits a peak around 60 K that is explained in terms of the paramagnetic to ferrimagnetic transition of the barrier.
- Received 8 April 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.276601
©2002 American Physical Society