Microwave-frequency spin-dependent tunneling in nanocomposites |
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| Authors: | A B Granovsky A A Kozlov T V Bagmut S V Nedukh S I Tarapov J P Clerc |
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| Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, 61085, Ukraine;(3) ME, Technopole de Cháteau-Gombert, école Polytechnique, Université de Marseille, Marseille, 13453, France |
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| Abstract: | The transmission coefficient of films of Co51.5Al19.5O29, Co50.2Ti9.1O40.7, Co52.3Si12.2O35.5, and (Co0.4Fe0.6)48(MgF)52 ferromagnetic metal-insulator magnetic nanocomposites exhibiting tunneling magnetoresistance and the magnetorefractive effect for electromagnetic waves was studied in the frequency range 30–50 GHz. The transmission coefficient of the first two compositions varies strongly under an applied magnetic field, and its variation exhibits a linear correlation with the field dependence of magnetoresistance. For the other two compositions, the transmission coefficient does not depend on magnetic field. The data obtained are interpreted in terms of the concept of microwave spin-dependent tunneling. |
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