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

Escanhoela Jr, 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 (2018) Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites. In: PHYSICAL REVIEW B, 98 (5).

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Abstract

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.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Additional Information:	Copy right for this article belong to AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	21 Aug 2018 15:52
Last Modified:	21 Aug 2018 15:52
URI:	http://eprints.iisc.ac.in/id/eprint/60474

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