Long-Range Electric Field Control of Permalloy Layers in Strain-Coupled Composite Multiferroics

Published

October 18, 2018

Author(s)

Michelle E. Jamer, Colin R. Rementer, Anthony Barra, Alexander Grutter, Kevin Fitzell, Daniel Gopman, Julie Borchers, Gregory P. Carman, Brian Kirby, Jane P. Chang

Abstract

Artificial composite multiferroic materials can be created by interfacing magnetostrictive and piezoelectric materials, allowing for electric field control of magnetic properties. For multilayer device applications, addition of weakly magnetostrictive layers is a potentially important means of tuning functionality. For such a device, the lengthscale over which weakly magnetostrictive layer(s) can be coupled to an applied electric field is of critical importance. In this work, we use polarized neutron reflectometry to characterize this distance for a model composite multiferroic multilayer system (PMN-PT/galfenol/permalloy). For a superlattice more than 100 nm thick, we observe that the magnetizations of all layers rotate coherently with applied electric field. Further, we observe electric field induced rotation across the entirety of a 46 nm permalloy layer anchored by a single galfenol interface. The confirmation of long-range magnetic coupling in these strain-coupled multiferroic composites opens extensive opportunities for designer technological applications.

Citation

Physical Review Applied

Volume

10

Issue

4

Pub Type

Journals

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Keywords

magnetism, neutron

Citation

Jamer, M. , Rementer, C. , Barra, A. , Grutter, A. , Fitzell, K. , Gopman, D. , Borchers, J. , Carman, G. , Kirby, B. and Chang, J. (2018), Long-Range Electric Field Control of Permalloy Layers in Strain-Coupled Composite Multiferroics, Physical Review Applied, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925739 (Accessed October 27, 2025)