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

Abstract

We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A2FeReO6 (A = Ca, Ba) using Re L2,3 edge x-ray absorption spectroscopy and powder diffraction measurements. Volume compression is shown to dramatically increase the magnetic coercivity (Hc) in polycrystalline samples of both compounds with ΔHc/ΔV similar to 150-200 Oe/Å3. A nearly eight-fold increase in Hc, 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 5d2 orbitals and use this description to provide insight into the pressure-induced enhancement of magnetic anisotropy.

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [2]
  1. Brazilian Synchrotron Light Lab., Campinas (Brazil); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)
  5. Indian Inst. of Science, Bangalore (India)
  6. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
  7. Brazilian Synchrotron Light Lab., Campinas (Brazil)
  8. Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1465770
Alternate Identifier(s):
OSTI ID: 1462588
Grant/Contract Number:  
AC02-06CH11357; AC-02-06CH11357; FG02-99ER45775; FG02-03ER46097; NA0001974
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Escanhoela, C. A., Fabbris, G., Sun, F., Park, C., Gopalakrishnan, J., Ramesha, K., Granado, E., Souza-Neto, N. M., van Veenendaal, M., and Haskel, D. Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.054402.
Escanhoela, C. A., Fabbris, G., Sun, F., Park, C., Gopalakrishnan, J., Ramesha, K., Granado, E., Souza-Neto, N. M., van Veenendaal, M., & Haskel, D. Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites. United States. doi:10.1103/PhysRevB.98.054402.
Escanhoela, C. A., Fabbris, G., Sun, F., Park, C., Gopalakrishnan, J., Ramesha, K., Granado, E., Souza-Neto, N. M., van Veenendaal, M., and Haskel, D. Thu . "Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites". United States. doi:10.1103/PhysRevB.98.054402. https://www.osti.gov/servlets/purl/1465770.
@article{osti_1465770,
title = {Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites},
author = {Escanhoela, C. A. and Fabbris, G. and Sun, F. and Park, C. and Gopalakrishnan, J. and Ramesha, K. and Granado, E. and Souza-Neto, N. M. and van Veenendaal, M. and Haskel, D.},
abstractNote = {We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A2FeReO6 (A = Ca, Ba) using Re L2,3 edge x-ray absorption spectroscopy and powder diffraction measurements. Volume compression is shown to dramatically increase the magnetic coercivity (Hc) in polycrystalline samples of both compounds with ΔHc/ΔV similar to 150-200 Oe/Å3. A nearly eight-fold increase in Hc, 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 5d2 orbitals and use this description to provide insight into the pressure-induced enhancement of magnetic anisotropy.},
doi = {10.1103/PhysRevB.98.054402},
journal = {Physical Review B},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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