Eur. Phys. J. B 35, 331-337 (2003)
https://doi.org/10.1140/epjb/e2003-00285-1

New insight on spin polarized current injection in high-T_c cuprate/manganite devices

¹ Laboratoire de Physique Quantique, École Supérieure de Physique et Chimie Industrielles, 10 rue Vauquelin, 75231 Paris Cedex 05, France
² Unité Mixte de Physique CNRS/Thales, Domaine de Corbeville, 91404 Orsay Cedex, France

Corresponding author: ^a brigitte.leridon@espci.fr

Received: 27 June 2002
Revised: 3 July 2003
Published online: 15 October 2003

Abstract

Recently, numerous experiments have been reported on critical current reductions in thin films cuprates as being due to spin injection from ferromagnetic manganites. However, little theoretical justification for these very strong effects exists, and the necessary spin relaxation length is always larger than predictions. In the present work, we investigate the possibility that these effects are due to a different origin and we report on devices designed such that the temperature of the layer itself can be measured in situ. Our data show that similar reductions of the critical current are quantitatively correlated to heating in the manganite electrode due to dissipation of the polarization current.