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This content will become publicly available on August 2, 2019

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

We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A 2FeReO 6 (A = Ca, Ba) using Re L 2,3 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 ΔH c/ΔV similar to 150-200 Oe/Å 3. A nearly eight-fold increase in H c, from 0.2 to 1.55 T, is obtained in Ba 2FeReO 6 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 ReO 6 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.
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:
Grant/Contract Number:
AC02-06CH11357; AC-02-06CH11357; FG02-99ER45775; FG02-03ER46097; NA0001974
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)
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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1465770
Alternate Identifier(s):
OSTI ID: 1462588