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

Journal Article · · Physical Review B
 [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)
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.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357; FG02-03ER46097; FG02-99ER45775; NA0001974
OSTI ID:
1465770
Alternate ID(s):
OSTI ID: 1462588
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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