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



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


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.
Physical Review Applied


magnetism, neutron


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], (Accessed June 24, 2024)


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Created October 17, 2018, Updated October 12, 2021