| Autor: |
Viorel Sandu, C. Plapcianu, E. Sandu, I. Nor, Nicolae Hurduc, Stelian Popa |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Advanced Materials Research. :326-330 |
| ISSN: |
1662-8985 |
| Popis: |
We report the transport and magnetic properties of sintered CrO2-polymer composites. In order to improve the elastic properties of the CrO2-based composites, we investigated two types of styrene-based copolymers: poly(methyl methacrylate)-styrene (9/1 and 5/5) and linear polysiloxaneg- styrene as well as poly(methyl methacrylate)–butadiene 9/1. The electric transport and magnetoresistance are consistent with the spin tunneling model at low temperatures but the contribution of spin independent channels becomes important at high temperature and high fields. All composites display ferromagnetism at room temperature with saturation at low fields and a slightly temperature-dependent coercive field for the samples grafted either with butadiene or with styrene except for CrO2-polysiloxane-g-styrene composite where it exponentially decreases with increasing temperature. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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