Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites
Journal Article
·
· Physical Review B
- Brazilian Synchrotron Light Lab., Campinas (Brazil); Argonne National Lab. (ANL), Argonne, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)
- Indian Inst. of Science, Bangalore (India)
- Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
- Brazilian Synchrotron Light Lab., Campinas (Brazil)
- 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
Zero-field-cooled exchange bias effect in phase-segregated La 2 − x A x CoMnO 6 − δ ( A = Ba,Ca,Sr ; x = 0 , 0.5 )
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journal | August 2019 |
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