Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8155412 | Journal of Magnetism and Magnetic Materials | 2016 | 5 Pages |
Abstract
Multilayers of 0.4Â nm Fe and 5Â nm Ag with repetition number, n=1, 2, 5, 10 and 20 were prepared by vacuum evaporation onto Si wafer. The blocking temperature was determined by measuring the field cooled and zero field cooled magnetization curves with a SQUID magnetometer and it was found to increase by almost an order of magnitude from around 20Â K for the single Fe layer sample up to around 160Â K for n=20. Significant increase of the average size of the superparamagnetic Fe grains by increasing the number of the Fe layers was excluded by conversion electron Mössbauer spectroscopy measurements of the paramagnetic state. The role of the dipole-dipole interactions and their interplay with the out-of-plain magnetic anisotropy in the variation of the blocking temperature has been investigated by Monte-Carlo simulations.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Judit Balogh, Dénes Kaptás, László F. Kiss, István Dézsi, Akio Nakanishi, Eamonn Devlin, Marianna Vasilakaki, George Margaris, Kalliopi N. Trohidou,