| Autor: |
Kobayashi, Nobukiyo, Ohnuma, Shigehiro, Masumoto, Tsuyoshi, Fujimori, Hiroyasu |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 10/15/2001, Vol. 90 Issue 8, p4159, 4p, 1 Black and White Photograph, 5 Graphs |
| Abstrakt: |
Insulating nanogranular-type tunnel magnetoresistive thin films made of (Fe or Fe–Co)–(Mg-fluoride) have been investigated. The films were prepared by a tandem deposition method, using Fe, Co, or Fe+Co metal and MgF[sub 2] insulator targets. The granular structure was found to consist of Fe or Fe–Co based nanogranules surrounded by thin intergranules of Mg based fluoride with the MgF[sub 2] crystal structure. A magnetoresistance value of 13.3% at room temperature and 10 kOe, the largest values ever reported, were obtained at the compositions of 32 vol %(Fe[sub 0.51]Co[sub 0.49])–(Mg–F). To increase the magnetic field sensitivity of the magnetoresistance, a granular-in-gap film consisting of an (Fe–Co)–(Mg–F) granular thin film filling a narrow gap in a soft magnetic Permalloy thin film was prepared. A remarkably high magnetoresistance of 4% or more at 1–2 Oe was obtained. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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