Magnetic properties of Fe-Ag multilayers with varying layer thickness and bilayer number
| Autor: | Dénes Kaptás, Judit Balogh, L. Bujdosó, L. F. Kiss |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed matter physics Bilayer 02 engineering and technology Parameter space 021001 nanoscience & nanotechnology 01 natural sciences Layer thickness Vacuum evaporation Ferromagnetism 0103 physical sciences Mixing zone Magnetic nanoparticles Nuclear Experiment 010306 general physics 0210 nano-technology Superparamagnetism |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.144423 |
| Popis: | Fe-Ag multilayers were prepared by vacuum evaporation in a wide range of Fe and Ag thicknesses (${t}_{\mathrm{Fe}}$, ${t}_{\mathrm{Ag}}$) and bilayer numbers $(n)$, while the magnetic properties as a function of these parameters were measured. Samples with discontinuous Fe layers are superparamagnetic (SPM) and our paper shows that ${t}_{\mathrm{Ag}}$ and $n$ affect the superparamagnetic blocking temperature (${T}_{\mathrm{B}}$) not only by affecting the interactions between the Fe grains but also through influencing the growth process of Fe and thereby modifying the magnetic-grain-size distribution. A magnetic ``phase diagram'' of our Fe-Ag multilayers is constructed in the ${t}_{\mathrm{Fe}}$, ${t}_{\mathrm{Ag}}$, $n$ parameter space, where the SPM and ferromagnetic behaviors are separated by a mixed zone showing the characteristics of both. The measured trend of the susceptibilities attained at the blocking temperature (${T}_{\mathrm{B}}$), increasing with increasing ${T}_{\mathrm{B}}$, was explained by the volume distribution of the magnetic particles, as illustrated by calculations for an ensemble of interaction-free magnetic particles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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