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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.)

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

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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]
Total Authors: 10
[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
Total Affiliations: 8
Document type: Journal article
Source: Physical Review B; v. 98, n. 5 AUG 2 2018.
Web of Science Citations: 3

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)

FAPESP's process: 16/24137-3 - Orbital magnetism in double perovskite compounds under extreme conditions by synchrotron radiation techniques
Grantee:Carlos Augusto Escanhoela Júnior
Support type: Scholarships abroad - Research Internship - Post-doctor