Giant magnetoresistance in granular FeSiO2 films

✍ Scribed by B. Zhao; X. Yan

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 481 KB
• Volume: 241
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/s0378-4371(97)00109-x

✦ Synopsis

We studied resistivity, magnetoresistivity and magnetization in granular Fe-SiO 2 films. In the hopping region, magnetoresistance was found to be as large as -5%, and is isotropic for different measurement geometry, which is the signature of giant magnetoresistance due to a spin-dependent conduction process. Temperature dependence of magnetoresistance could be described qualitatively but not quantitatively by two specific spin-dependent tunnelling models. We found that resistivity p changes five orders of magnitude by altering measurement temperature, annealing temperature or metal volume fraction, and that magnetoresistivity -Ap increases with p monotonously.