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

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2020 May 12

PMID 32391493

Citations 7

Authors

Marcelo Assis

Renan Augusto Pontes Ribeiro

Maria Helena Carvalho

Mayara Mondego Teixeira

Yara Galvao Gobato

Gabriela Augusta Prando

Cleber Renato Mendonca

Leonardo de Boni

Adilson Jesus Aparecido de Oliveira

Jefferson Bettini

Juan Andres

Elson Longo

Affiliations

Soon will be listed here.

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 α-AgWO under electron beam and femtosecond laser irradiation. The formation and growth of silver oxides (AgO, AgO, and AgO) and Ag nanofilaments can be observed on the surface of α-AgWO 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 α-AgWO, AgO, AgO, 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.

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