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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites

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Autor(es):
Escanhoela Jr, C. A. ; Fabbris, G. [1] ; Sun, F. [2, 1] ; Park, C. [3] ; Gopalakrishnan, J. [4, 5] ; Ramesha, K. [4] ; Granado, E. [6] ; Souza-Neto, N. M. [7] ; van Veenendaal, M. [8, 1] ; Haskel, D. [1]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Escanhoela Jr, Jr., C. A., Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA
[2] Ctr High Pressure Sci & Technol Adv Res HPSTAR, Shanghai 201203 - Peoples R China
[3] Carnegie Inst Sci, HPCAT, Argonne, IL 60439 - USA
[4] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka - India
[5] Cent Electrochem Res Inst, Madras Unit, CSIR, Madras, Tamil Nadu - India
[6] Univ Estadual Campinas, Gleb Wataghin Inst Phys, UNICAMP, BR-13083859 Campinas, SP - Brazil
[7] Escanhoela Jr, Jr., C. A., Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[8] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 - USA
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 98, n. 5 AUG 2 2018.
Citações Web of Science: 3
Resumo

We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A(2)FeReO(6) (A = Ca, Ba) using Re L-2,L-3 edge x-ray absorption spectroscopy and powder diffraction measurements. Volume compression is shown to dramatically increase the magnetic coercivity (H-c) in polycrystalline samples of both compounds with Delta H-c/Delta V similar to 150-200 Oe/angstrom(3). A nearly eight-fold increase in H-c, from 0.2 to 1.55 T, is obtained in Ba2FeReO6 at P = 29 GPa. While no signs of structural phase transitions are seen in either sample to similar to 30 GPa, the structural data points to a pressure-driven increase in tetragonal distortion of ReO6 octahedra. A sizable but pressure-independent Re orbital-to-spin magnetic moment ratio is observed, pointing to the critical role of spin-orbit interactions at Re sites. We present a J(eff) description of the electronic structure that combines effects of crystal field and spin-orbit coupling on the Re 5d(2) orbitals and use this description to provide insight into the pressure-induced enhancement of magnetic anisotropy. (AU)

Processo FAPESP: 16/24137-3 - Estudo do magnetismo orbital em compostos de perovskita dupla sob condições extremas utilizando técnicas de radiação síncrotron
Beneficiário:Carlos Augusto Escanhoela Júnior
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado