Large low-field magnetoresistance in ferrite/insulator granular systems

Authors
Chen, P Du, YW
Citation
P. Chen et Yw. Du, Large low-field magnetoresistance in ferrite/insulator granular systems, J MAGN MAGN, 219(3), 2000, pp. 265-268
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
219
Issue
3
Year of publication
2000
Pages
265 - 268
Database
ISI
SICI code
0304-8853(200009)219:3<265:LLMIFG>2.0.ZU;2-U
Abstract
Large low-field magnetoresistance in (ZnxFe3-xO4)(0.56+delta)/(Fe2O3)(0.44- delta) (x = 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, - 0.02 < delta < 0.02) granular s ystems has been observed in a wide temperature range while the single-phase samples of ZnxFe3-xO4 show smaller magnetoresistance ( <2%). GMR Effect (3 4%) is shown for x = 0.5 in magnetic field 5 kOe at room temperature. The G MR effect of the samples is attributed to the disorder-driven amplification of spin-dependent transport at the structural boundaries of the mixture. ( C) 2000 Elsevier Science B.V. All rights reserved.