Cubic to hexagonal tuning in Fe2Mn(Si1-xGex) Heusler alloys

Autor: Andrade, Vivian Maria Campos Soares de, Pirota, Kleber Roberto, 1973, Béron, Fanny, 1980
Přispěvatelé: UNIVERSIDADE ESTADUAL DE CAMPINAS
Rok vydání: 2022
Předmět:
Zdroj: Repositório Institucional da Unicamp
Universidade Estadual de Campinas (UNICAMP)
instacron:UNICAMP
Repositório da Produção Científica e Intelectual da Unicamp
Popis: Agradecimentos: MSR thanks the Brazilian agencies CNPq, FAPERJ, and PROPPI-UFF for financial support. BMP thanks the CNPq for financial support. VGP thanks the CNPq for the financial support under grant no. 160744/2019-9. VMA thanks IFIMUP and FCT for the contract under the project POCI-01-0145-FEDER-028676 and the financial support through the UIDB/04968/2020. MSR belongs to the INCT of Refrigeração e Termofísica, funding by CNPq by grant number 465448/2014-3. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 and project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. This work was also financed by the Fundação de Amparo a Pesquisa do Estado de São Paulo, Brasil (FAPESP) - Project No. 2017/10581-1. JSA acknowledges FCT for grant IF/01089/2015. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory Abstract: The competition between the stability of the cubic and hexagonal full Heusler alloys and the implications concerning their magnetic properties were systematically studied through the detailed structural and magnetic characterization of the Fe2Mn(Si1-xGex) system. This system was specifically chosen as the parent compositions are cubic (x = 0) and hexagonal (x = 1). It is found that the formation of hexagonal phases occurs for the x >= 0.6 samples, whereas its phase fraction monotonically increases with x until the pure hexagonal Fe2MnGe is formed. The change in structure results in high sensitiveness of both the saturation of magnetization (MS) and Curie temperature (TC) with x values, related to a strong magnetocrystalline anisotropy of the hexagonal phase. Both cubic and hexagonal magnetic features were qualitatively reproduced by Density Functional Theory (DFT) calculations. This work provides an experimental and theoretical foundation for further design of Heusler systems with controlled structures and magnetic properties CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ FUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIRO - FAPERJ COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Fechado
Databáze: OpenAIRE
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