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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Weinforth, H. Somsen, C. Rellinghaus, B. Carl, A. Wassermann, E.F. Weller, D. |
| Copyright Year | 1965 |
| Abstract | We report on the structural, electrical and magnetic properties of thin Co/sub x/C/sub 1-x/ granular films with metal volume fraction x=0.27 close to the percolation threshold x/sub p//spl ap/0.3. The granular films are prepared by simultaneous UHV electron beam evaporation of high purity Co and C at room temperature. The structural properties are determined from transmission electron microscopy revealing small Co clusters with mean diameters of about 3 nm randomly dispersed in an electrically insulating C matrix. As-prepared films show insulating resistance behavior. Upon annealing to T/sub a/=600/spl deg/C in-situ measurements within the electron microscope show coalescence of the Co clusters forming continuous cluster-networks. Resistance versus temperature and magnetoresistance measurements on annealed films show a gradual change from insulating to metallic behavior. Room temperature measurements of the magnetic properties show the evolution of ferromagnetic behavior from superparamagnetic behavior upon annealing with a formation of an unusual perpendicular anisotropy. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 1132 |
| Ending Page | 1134 |
| Page Count | 3 |
| File Size | 640065 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 34 |
| Issue Number | 4 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1998-07-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Magnetic properties Magnetic films Annealing Temperature measurement Electric resistance Electrical resistance measurement Electron beams Transmission electron microscopy Dielectrics and electrical insulation Electron microscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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