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Título

Crystal structure and local ordering in epitaxial Fe1 00−xGax/MgO (001) films

AutorIbarra, Alfonso; Ciria, Miguel CSIC ORCID; Proietti, M. G. ; Corredor, Edna C. CSIC; Coffey, David; Begué Gracia, Adrián CSIC ORCID; Fuente, César de la
Palabras claveEXAFS
Fe-Ga alloys
RHEED
TEM
Thin films
X-ray diffraction
Fecha de publicación2019
CitaciónMicroscopy at the Frontiers of Science Congress (2019)
ResumenIron-gallium alloys (Fe100−xGax) have become an important material for magnetostrictive applications because of their large tetragonal magnetostriction at low field for alloys around 18.4 % Ga, whereas, at the same time, they provide good corrosion resistance and mechanical hardness. Large magnetoelastic (ME) coupling is a rewarding property in thin films and patterned elements, as the ME anisotropy can control the orientation of the magnetization M. Epitaxial Fe100−xGax thin films have shown a remarkable potential for microwave and energy conversion applications, by using a piezoelectric layer to control the magnetic anisotropy through the modification of the strain in the magnetic layer by means of an applied voltage. In this work we present a study of the structural properties of Fe100−x Gax (x<30) films grown by Molecular Beam Epitaxy on Mg0(100). We combine long range and local/chemically selective X-ray probes (X-ray Diffraction and X-ray absorption spectroscopy) together with real space imaging by means of Transmission Electron Microscopy and surface sensitive in situ Reflected High Energy Electron Diffraction. For substrate temperature Ts below 400ºC we obtain bcc films while, for x ≈ 24 and Ts ≥ 400ºC the nucleation of the fcc phase is observed. For both systems a Ga anticlustering or local range ordering phenomenon appears. The Ga/Fe composition in the first and second coordination shells of the bcc films is different from that expected for a random Ga distribution and is close to a D03 phase, leading to a minimization of the number Ga-Ga pairs. On the other side, a long-range D03 phase is not observed indicating that atomic ordering only occurs at a local scale. Overall, the epitaxial growth procedure presented in this work, first, avoids the formation of a long range ordered D03 phase, which is known to be detrimental for magnetostrictive properties, and second, demonstrates the possibility of growing fcc films at temperatures much lower than those required to obtain bulk fcc samples.
DescripciónResumen del póster presentado al Microscopy at the Frontiers of Science Congress Series (MFS), celebrado en el Parque de las Ciencias de Granada (España) del 11 al 13 de septiembre de 2019.
URIhttp://hdl.handle.net/10261/209134
Aparece en las colecciones: (ICMA) Comunicaciones congresos




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