Magnetic viscosity effects in epitaxial L10 FePt thin films and exchange spring Fe–FePt bilayers |
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| Authors: | C Pernechele M Solzi R Pellicelli M Ghidini F Albertini F Casoli |
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| Institution: | 1. Dipartimento di Fisica, Università di Parma and CNISM, Via G.P. Usberti 7/A, Parma 43100, Italy;2. IMEM-CNR, Parco Area delle Scienze 37/A, Parma 43010, Italy |
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| Abstract: | We have studied the thermal stability of L10 FePt thin films and Fe–FePt exchange-spring (ES) bilayers grown on (1 0 0) MgO by RF sputtering. The viscosity curves showed both for FePt films and bilayers a clear logarithmic decay of magnetization. Moreover, it was possible to evaluate the viscosity coefficient S for different applied reverse fields and the activation volumes at the coercivity. The latter values were then related to structural, magnetic and morphological measurements performed on the samples. |
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| Keywords: | 75 50 Ww 75 60 Ej 73 50 Rb 75 50 i |
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