Effect of Exchange Bias on Magnetic Anisotropies in Fe/CoO Bilayers |
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Authors: | M. ?ztürk E. Demirci R. Topkaya S. Kazan N. Akdo?an M. Obaida K. Westerholt |
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Affiliation: | 1. Department of Physics, Gebze Institute of Technology, 41400, Kocaeli, Turkey 2. Nanomagnetism and Spintronics Research Center (NASAM), Gebze Institute of Technology, 41400, Kocaeli, Turkey 3. Institut f??r Experimentalphysik/Festk?rperphysik, Ruhr-Universit?t Bochum, 44780, Bochum, Germany
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Abstract: | We report on the structural and magnetic properties of exchange-biased Fe/CoO bilayers grown on MgO (001) substrates by using rf-sputtering. For varying Fe thicknesses (4 nm, 10 nm, and 20 nm) the ferromagnetic resonance (FMR) spectra of bilayers have been studied as a function of temperature at X-band frequency. The resonance lines of FMR spectra have a relatively small linewidth indicating a high crystallinity of the Fe films. The room-temperature FMR data also show that the easy axis of Fe is in the film plane and parallel to the [110] crystallographic direction of MgO substrate. In addition, M versus H loops were recorded at selected temperatures by using VSM magnetometry. The VSM measurements indicate that the Fe thickness and temperature dependence of exchange-bias properties are in good agreement with the previous results on similar systems. However, the blocking temperature of the exchange-biased system is strongly reduced compared to the bulk values. This reduction in the blocking temperature is explained by both the thickness and superstoichiometric structure of antiferromagnetic CoO layer. |
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