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

Author(s):Show less -

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]

Affiliation

^[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

• Document type: Journal article
• Source: ACS OMEGA; v. 5, n. 17, p. 10052-10067, MAY 5 2020.
• Web of Science Citations: 0

Abstract

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 Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: 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 Opportunities: 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 Opportunities: 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 Opportunities: Scholarships abroad - Research
• FAPESP's process: 17/24995-2 - Magnetism in multifunctional materials
• Grantee: Adilson Jesus Aparecido de Oliveira
• Support Opportunities: Regular Research Grants