Peculiar CIP transport in CoFe/Al2O3 granular layered films across a micro-gap

• Tipo: Artigo em Revista Científica Internacional
• Data: 2002

Autores

Santos, JAM (Autor) Outra; G.N. Kakazei (Autor) Outra; sousa, j. b. (Autor) FCUP; Cardoso, S (Autor) Outra; Freitas, PP (Autor) Outra; pogorelov, y. g. (Autor) FCUP; Snoeck, E (Autor) Outra

Revista

Título: Journal of Magnetism and Magnetic Materials

Vol. 242

Páginas: 485-488

ISSN: 0304-8853

Editora: Elsevier

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 3 Citações

Outras Informações

ID Authenticus: P-000-PW9

DOI: 10.1016/s0304-8853(01)01055-1

Abstract (EN): Current-in-plane (CIP) transport properties are reported in discontinuous granular layers of CoFe/Al2O3 across a 10 mum gap between lithographed Al contacts, CIP magnetoresistance is found to degrade sensibly with bias voltage V, e.g., from 7% to 3.5% (at room temperature) with V growing from 100 mV to 14 V. The I-V characteristics display a strong non-linear dependence, similar to the high-field tunneling regime known for current-perpendicular-to-plane (CPP) transport, but here it occurs under much weaker electric field and even at room temperature when Coulomb blockade is ruled out. We explain these anomalies by the processes of dynamic charge accumulation under the macroscopic contacts.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4