Strain Mediated Voltage Control of Magnetic Anisotropy and Magnetization Reversal in Bismuth Substituted Yttrium Iron Garnet Films and Meso-structures

Published

November 21, 2025

Author(s)

Walid Al Misba, Miela Gross, kensuke hayashi, Daniel Gopman, Caroline Ross, Jayasimha Atulasimha

Abstract

We report on magnetic anisotropy modulation in Bismuth substituted Yttrium Iron Garnet (Bi-YIG) thin films and mesoscale patterned structures deposited on a PMN-PT substrate with the application of voltage-induced strain. The Bi content is selected for low coercivity and higher magnetostriction than that of YIG, yielding significant changes in the hysteresis loops through the magnetoelastic effect by application of voltage-induced strain. The piezoelectric substrate is poled along its thickness, which is the [011] direction, by applying a voltage across the PMN-PT/SiO2/Bi-YIG/Pt heterostructure. In-situ magneto-optical Kerr effect microscopy (MOKE) shows the modulation of magnetic anisotropy with voltage-induced strain. Furthermore, voltage control of the magnetic domain state of the Bi-YIG film at a fixed magnetic field produces a "90" ° switching of the magnetization easy axis above a threshold voltage. The magnetoelectric coefficient of the heterostructure is 1.05 ×10^(-7) "s" "m" ^"-1" which is competitive with that of other ferromagnetic oxide films on ferroelectric substrates such as LSMO/PMNPT and YIG/PMN-PZT. Voltage-control of magnetization reversal fields in (5 – 30) µm wide dots and racetracks show potential for energy efficient non-volatile memory and neuromorphic computing devices.

Citation

Applied Physics Letters Materials

Pub Type

Journals

Download Paper

Local Download

Citation

Misba, W. , Gross, M. , Hayashi, K. , Gopman, D. , Ross, C. and Atulasimha, J. (2025), Strain Mediated Voltage Control of Magnetic Anisotropy and Magnetization Reversal in Bismuth Substituted Yttrium Iron Garnet Films and Meso-structures, Applied Physics Letters Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959036 (Accessed December 13, 2025)