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Evolution of the magnetic hyperfine field profiles in an ion-irradiated Fe60Al40 film measured by nuclear resonant reflectivity
- Source :
- Journal of Synchrotron Radiation. 28:1535-1543
- Publication Year :
- 2021
- Publisher :
- International Union of Crystallography (IUCr), 2021.
-
Abstract
- Nuclear resonant reflectivity (NRR) from an Fe60Al40 film was measured using synchrotron radiation at several grazing angles near the critical angle of total external reflection. Using laterally resolved measurements after irradiation with 20 keV Ne+ ions of gradually varying fluence of 0–3.0 × 1014 ions cm−2, the progressive creation of the ferromagnetic A2 phase with increasing ion fluence was confirmed. The observed depth selectivity of the method has been explained by application of the standing wave approach. From the time spectra of the nuclear resonant scattering in several reflection directions the depth profiles for different hyperfine fields were extracted. The results show that the highest magnetic hyperfine fields (∼18–23 T) are initially created in the central part of the film and partially at the bottom interface with the SiO2 substrate. The evolution of the ferromagnetic onset, commencing at a fixed depth within the film and propagating towards the interfaces, has been directly observed. At higher fluence (3.0 × 1014 ions cm−2) the depth distribution of the ferromagnetic fractions became more homogeneous across the film depth, in accordance with previous results.
- Subjects :
- Nuclear and High Energy Physics
Total internal reflection
Radiation
Materials science
Synchrotron radiation
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Fluence
Ion
X-ray reflectivity
0103 physical sciences
Total external reflection
Reflection (physics)
Atomic physics
010306 general physics
0210 nano-technology
Instrumentation
Hyperfine structure
Subjects
Details
- ISSN :
- 16005775
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Journal of Synchrotron Radiation
- Accession number :
- edsair.doi...........23091eb2e71e1cc06d9eef9d850ff808