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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Unconventional Magnetization Generated from Electron Beam and Femtosecond Irradiation on alpha-Ag2WO4: A Quantum Chemical Investigation

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Assis, Marcelo [1] ; Ribeiro, Renan A. P. [1] ; Carvalho Costa, Maria Helena [2] ; Mondego Teixeira, Mayara [1] ; Galvao Gobato, Yara [2] ; Prando, Gabriela A. [2] ; Renato Mendonca, Cleber [3] ; de Boni, Leonardo [3] ; Aparecido de Oliveira, Adilson Jesus [2] ; Bettini, Jefferson [4] ; Andres, Juan [5] ; Longo, Elson [1]
Total Authors: 12
[1] Fed Univ Sao Carlos UFSCar, Chem Dept, LIEC, CDMF, Sao Carlos 13565905, SP - Brazil
[2] Fed Univ Sao Carlos UFSCar, Phys Dept, Sao Carlos 13565905, SP - Brazil
[3] Univ Sao Paulo, IFSC Inst Fis Sao Carlos, Sao Carlos 13566590, SP - Brazil
[4] Brazilian Nanotechnol Natl Lab LNNano, BR-13083100 Campinas, SP - Brazil
[5] Univ Jaume I UJI, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain
Total Affiliations: 5
Document type: Journal article
Source: ACS OMEGA; v. 5, n. 17, p. 10052-10067, MAY 5 2020.
Web of Science Citations: 0

Novel magnetic metals and metal oxides that use both the spin and charge of an electron offer exciting technological applications. Their discovery could boost research on functional nanoscale materials. Here, for the first time, we report the magnetization of alpha-Ag2WO4 under electron beam and femtosecond laser irradiation. The formation and growth of silver oxides (Ago, Ag2O, and Ag3O4) and Ag nanofilaments can be observed on the surface of alpha-Ag2WO4 crystals. These features were also present in the composition of an extruded material and could open new avenues for surface magnetism studies. In order to understand these results, we used first-principles density functional theory calculations. This allowed us to investigate several potential scenarios for controlling magnetic properties. The effect of electron addition on the crystalline structures of alpha-Ag2WO4, Ag2WO4, Ag2O, and AgO has been analyzed in detail. The creation of Ag and O vacancies on these compounds was also analyzed. Based on structural and electronic changes at the local coordination site of Ag, a mechanism was proposed. The mechanism illustrates the processes responsible for the formation and growth of metallic Ag and the magnetic response to electron beam irradiation. (AU)

FAPESP's process: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials
Grantee:Cleber Renato Mendonça
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/10668-7 - Optical and Transport Properties of two-dimensional semicondutors based on transition metal dichalcogenides
Grantee:Yara Galvão Gobato
Support type: Regular Research Grants
FAPESP's process: 16/20886-1 - Ultrafast nonlinear optical spectroscopy: Transient Absorption and optical Kerr Gate with polarization control
Grantee:Leonardo De Boni
Support type: Regular Research Grants
FAPESP's process: 18/01808-5 - Optical and Transport Properties in High Magnetic Fields of Semiconductor Heterostructures and Devices based on Two Dimensional Materials
Grantee:Yara Galvão Gobato
Support type: Scholarships abroad - Research
FAPESP's process: 17/24995-2 - Magnetism in multifunctional materials
Grantee:Adilson Jesus Aparecido de Oliveira
Support type: Regular Research Grants