Manipulation of spin orientation via ferroelectric switching in Fe-doped Bi2 WO6 from first principles

Katherine Inzani, Nabaraj Pokhrel, Nima Leclerc, Zachary Clemens, Sriram P. Ramkumar, Sinéad M. Griffin, Elizabeth A. Nowadnick

Research output: Contribution to journalArticlepeer-review

Abstract

Atomic-scale control of spins by electric fields is highly desirable for future technological applications. Magnetically doped Aurivillius-phase oxides present one route to achieve this, with magnetic ions substituted into the ferroelectric structure at dilute concentrations, resulting in spin-charge coupling. However, there has been minimal exploration of the ferroelectric switching pathways in this materials class, limiting predictions of the influence of an electric field on magnetic spins in the structure. Here, we determine the ferroelectric switching pathways of the end member of the Aurivillius phase family, Bi2WO6, using a combination of group theoretic analysis and density functional theory calculations. We find that in the ground state P21ab phase, a two-step switching pathway via C2 and Cm intermediate phases provides the lowest energy barrier. Considering iron substitutions on the W site in Bi2WO6, we determine the spin easy axis. By tracking the change in spin directionality during ferroelectric switching, we find that a 90∘ switch in the polarization direction leads to a 112° reorientation of the spin easy axis. The low-symmetry crystal-field environment of Bi2WO6 and magnetoelastic coupling on the magnetic dopant provide a route to spin control via an applied electric field.

Original languageEnglish (US)
Article number054434
JournalPhysical Review B
Volume105
Issue number5
DOIs
StatePublished - Feb 1 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Manipulation of spin orientation via ferroelectric switching in Fe-doped Bi2 WO6 from first principles'. Together they form a unique fingerprint.

Cite this