Enhanced magnetoelectric coupling in a composite multiferroic system via interposing a thin film polymer

Xiao, Zhuyun; Mohanchandra, K. P.; Conte, Roberto Lo; Karaba, C. Ty; Schneider, J.; Chavez, Andres C.; Tiwari, Sidhant; Sohn, Hyunmin; Nowakowski, Mark E.; Schöll, A.; Tolbert, Sarah H.; Bokor, Jeffrey; Carman, Gregory P.; Candler, Rob N.

doi:10.1063/1.5007655

Cited by 19 publications

(19 citation statements)

References 14 publications

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“…A number of mechanisms for controlling magnetism using electric fields have been utilized. One approach has been to use multiferroic (MF) materials in which the magnetic moments are either directly coupled to electric dipoles (intrinsic multiferroics) or strain-coupled to piezoelectric materials in composite heterostructures 6–12 . There are very few intrinsic MF materials at room temperature, thus composite MF materials are more commonly used.…”

Section: Introductionmentioning

confidence: 99%

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Robbennolt

Menéndez

Quintana

et al. 2019

Sci Rep

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The magnetic properties of mesoporous cobalt ferrite films can be largely tuned by the application of an electric field using a liquid dielectric electrolyte. By applying a negative voltage, the cobalt ferrite becomes reduced, leading to an increase in saturation magnetization of 15% ( M S ) and reduction in coercivity ( H C ) between 5–28%, depending on the voltage applied (−10 V to −50 V). These changes are mainly non-volatile so after removal of −10 V M S remains 12% higher (and H C 5% smaller) than the pristine sample. All changes can then be reversed with a positive voltage to recover the initial properties even after the application of −50 V. Similar studies were done on analogous films without induced porosity and the effects were much smaller, underscoring the importance of nanoporosity in our system. The different mechanisms possibly responsible for the observed effects are discussed and we conclude that our observations are compatible with voltage-driven oxygen migration ( i.e ., the magneto-ionic effect).

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Section: Introductionmentioning

confidence: 99%

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Robbennolt

Menéndez

Quintana

et al. 2019

Sci Rep

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“…While useful in a wide range of other applications, composite MFs have remained unsuitable for spintronic devices because of issues such as clamping with the substrate (which strongly limits the generated strain) or mechanical fatigue. 4 , 5 , 8 …”

Section: Introductionmentioning

confidence: 99%

Large magnetoelectric effects mediated by electric-field-driven nanoscale phase transformations in sputtered (nanoparticulate) and electrochemically dealloyed (nanoporous) Fe–Cu films

et al. 2018

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“…Furthermore, a small edge roughness is confirmed by scanning electron microscopy imaging (see Figure S4 in Supporting Information). Interestingly, a recent study has shown that interface defects introduced by the PMN–PT surface roughness can be reduced by depositing a thin film polymer between the PMN–PT and Pt layers, offering a possible path toward a pinning-free multiferroic system with a more uniform magnetic response.…”

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confidence: 99%

Influence of Nonuniform Micron-Scale Strain Distributions on the Electrical Reorientation of Magnetic Microstructures in a Composite Multiferroic Heterostructure

et al. 2018

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Composite multiferroic systems, consisting of a piezoelectric substrate coupled with a ferromagnetic thin film, are of great interest from a technological point of view because they offer a path toward the development of ultralow power magnetoelectric devices. The key aspect of those systems is the possibility to control magnetization via an electric field, relying on the magneto-elastic coupling at the interface between the piezoelectric and the ferromagnetic components. Accordingly, a direct measurement of both the electrically induced magnetic behavior and of the piezo-strain driving such behavior is crucial for better understanding and further developing these materials systems. In this work, we measure and characterize the micron-scale strain and magnetic response, as a function of an applied electric field, in a composite multiferroic system composed of 1 and 2 μm squares of Ni fabricated on a prepoled [Pb(MgNb)O]-[PbTiO] (PMN-PT) single crystal substrate by X-ray microdiffraction and X-ray photoemission electron microscopy, respectively. These two complementary measurements of the same area on the sample indicate the presence of a nonuniform strain which strongly influences the reorientation of the magnetic state within identical Ni microstructures along the surface of the sample. Micromagnetic simulations confirm these experimental observations. This study emphasizes the critical importance of surface and interface engineering on the micron-scale in composite multiferroic structures and introduces a robust method to characterize future devices on these length scales.

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Enhanced magnetoelectric coupling in a composite multiferroic system via interposing a thin film polymer

Cited by 19 publications

References 14 publications

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Large magnetoelectric effects mediated by electric-field-driven nanoscale phase transformations in sputtered (nanoparticulate) and electrochemically dealloyed (nanoporous) Fe–Cu films

Influence of Nonuniform Micron-Scale Strain Distributions on the Electrical Reorientation of Magnetic Microstructures in a Composite Multiferroic Heterostructure

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