Laser-induced positional and chemical lattice reordering generating ferromagnetism

Pflug, Theo ; Pablo-Navarro, Javier (Universidad de Zaragoza) ; Anwar, Md. Shabad ; Olbrich, Markus ; Magén, César (Universidad de Zaragoza) ; Ibarra, Manuel Ricardo (Universidad de Zaragoza) ; Potzger, Kay ; Faßbender, Jürgen ; Lindner, Jürgen ; Horn, Alexander ; Bali, Rantej

Resumen: Atomic scale reordering of lattices can induce local modulations of functional material properties, such as reflectance and ferromagnetism. Pulsed femtosecond laser irradiation enables lattice reordering in the picosecond range. However, the dependence of the phase transitions on the initial lattice order as well as the temporal dynamics of these transitions remain to be understood. This study investigates the laser‐induced atomic reordering and the concomitant onset of ferromagnetism in thin Fe‐based alloy films with vastly differing initial atomic orders. The optical response to single femtosecond laser pulses on selected prototype systems, one that initially possesses positional disorder, Fe60V40, and a second system initially in a chemically ordered state, Fe60Al40, has been tracked with time. Despite the vastly different initial atomic orders the structure in both systems converges to a positionally ordered but chemically disordered state, accompanied by the onset of ferromagnetism. Time‐resolved measurements of the transient reflectance combined with simulations of the electron and phonon temperatures reveal that the reordering processes occur via the formation of a transient molten state with an approximate lifetime of 200 ps. These findings provide insights into the fundamental processes involved in laser‐induced atomic reordering, paving the way for controlling material properties in the picosecond range.

Idioma: Inglés

DOI: 10.1002/adfm.202311951

Año: 2023

Publicado en: Advanced Functional Materials 34, 13 (2023), 2311951 [9 pp.]
ISSN: 1616-301X

Factor impacto JCR: 18.5 (2023)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 11 / 178 = 0.062 (2023) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 21 / 439 = 0.048 (2023) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 9 / 141 = 0.064 (2023) - Q1 - T1
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 5 / 79 = 0.063 (2023) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 10 / 231 = 0.043 (2023) - Q1 - T1
Categ. JCR: PHYSICS, APPLIED rank: 9 / 179 = 0.05 (2023) - Q1 - T1

Factor impacto CITESCORE: 29.5 - Condensed Matter Physics (Q1) - Chemistry (all) (Q1) - Materials Science (all) (Q1)

Factor impacto SCIMAGO: 5.496 - Biomaterials (Q1) - Electrochemistry (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Nanoscience and Nanotechnology (Q1) - Condensed Matter Physics (Q1) - Materials Science (miscellaneous) (Q1) - Chemistry (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E13-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER E28-23R
Financiación: info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)