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Imaging and ferroelectric orientation mapping of photostriction in a single Bismuth Ferrite nanocrystal

DOI: 10.1038/s41524-024-01287-6 DOI Help

Authors: Ahmed H. Mokhtar (University of Southampton) , David Serban (University of Southampton) , Daniel G. Porter (Diamond Light Source) , Gareth Nisbet (Diamond Light Source) , Steve Collins (Diamond Light Source) , Alessandro Bombardi (Diamond Light Source) , Marcus C. Newton (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Npj Computational Materials , VOL 10

State: Published (Approved)
Published: May 2024
Diamond Proposal Number(s): 25437

Open Access Open Access

Abstract: The exploration of multiferroic materials and their interaction with light at the nanoscale presents a captivating frontier in materials science. Bismuth Ferrite (BiFeO3, BFO), a standout among these materials, exhibits room-temperature ferroelectric and antiferromagnetic behaviour and magnetoelectric coupling. Of particular interest is the phenomenon of photostriction, the light-induced deformation of crystal structures, which enhances the prospect for device functionality based on these materials. Understanding and harnessing multiferroic phenomena holds significant promise in various technological applications, from optoelectronics to energy storage. The orientation of the ferroelectric axis is an important design parameter for devices formed from multiferroic materials. Determining its orientation in the laboratory frame of reference usually requires knowing multiple wavevector transfer (Q-Vector) directions, which can be challenging to establish due to the need for extensive reciprocal-space searches. Our study demonstrates a method to identify the ferroelectric axis orientation using Bragg Coherent X-ray Diffraction Imaging (BCDI) measurements at a single Q-vector direction. This method involves applying photostriction-inducing laser illumination across various laser polarisations. Our findings reveal that photostriction primarily occurs as a surface phenomenon at the nanoscale. Moreover, a photo-induced crystal length change ranging from 30 to 60 nm was observed, consistent with earlier findings on bulk material.

Diamond Keywords: Ferroelectricity; Antiferromagnetism

Subject Areas: Materials, Physics

Instruments: I16-Materials and Magnetism

Added On: 09/05/2024 10:39


Discipline Tags:

Quantum Materials Multiferroics Physics Magnetism Materials Science

Technical Tags:

Imaging Coherent Diffraction Imaging (CDI) Bragg CDI