Determination of the magnetostrictive atomic environments in FeCoB alloys
| Autor: | L. M. Alvarez-Prado, Sakura Pascarelli, J. Díaz, C. Quirós, Rocío Ranchal, C. Aroca, M. P. Ruffoni |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España) |
| Rok vydání: | 2012 |
| Předmět: |
010302 applied physics
Telecomunicaciones Materials science Amorphous metal Extended X-ray absorption fine structure Condensed matter physics Física chemistry.chemical_element Magnetostriction Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Amorphous solid Tetragonal crystal system Nuclear magnetic resonance chemistry Interstitial defect 0103 physical sciences Crystallite 010306 general physics Boron |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Physical Review B, ISSN 1098-0121, 2012-04, Vol. 85, No. 13 Archivo Digital UPM |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.85.134437 |
| Popis: | PACS number(s): 61.05.cj, 61.43.Dq, 75.80.+q, 75.50.Kj.-- et al. The atomic environments of Fe and Co involved in the magnetostriction effect in FeCoB alloys have been identified by differential extended x-ray fine structure (DiffEXAFS) spectroscopy. The study, done in amorphous and polycrystalline FeCoB films, demonstrates that the alloys are heterogeneous and that boron plays a crucial role in the origin of their magnetostrictive properties. The analysis of DiffEXAFS in the polycrystalline and amorphous alloys indicates that boron activates magnetostriction when entering as an impurity into octahedral interstitial sites of the Fe bcc lattice, causing its tetragonal distortion. Magnetostriction would be explained then by the relative change in volume when the tetragonal axis of the site is reoriented under an externally applied magnetic field. The experiment demonstrates the extreme sensitivity of DiffEXAFS to characterize magnetostrictive environments that are undetectable in their related EXAFS spectra. © 2012 American Physical Society. Work supported by Spanish MICINN (Grant Nos. FIS2008-06249 and HP2008-0032). |
| Databáze: | OpenAIRE |
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