Voltage-driven annihilation and creation of magnetic vortices in Ni discs

Ghidini, M.; Mansell, Rhodri; Pellicelli, R.; Pesquera, David; Nair, Bhaskaran; Moya, Xavier; Farokhipoor, Saeedeh; Maccherozzi, F.; Barnes, C. H. W.; Cowburn, R. P.; Dhesi, S. S.; Mathur, N. D.

doi:10.1039/c9nr08672b

Cited by 10 publications

(16 citation statements)

References 49 publications

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“…Further reports on strain-mediated effects include electric-field controlled motion of magnetic domain walls around the circumference of magnetic ring structures on PMN-PT [265,266] and electric-field tuning of the chirality of magnetic vortex walls in Ni/PMN-PT [267]. Other non-collinear spin structures such as vortices have been manipulated by electric fields in Ni nanodisks on PMN-PT [268,269]. Particularly interesting is the prospect of electric-field control of topologically protected magnetic skyrmions which, because of their small size and stability, are a promising candidate as information carrier in future spintronics devices.…”

Section: Electric-field Control Of Magnetismmentioning

confidence: 99%

Roadmap on Magnetoelectric Materials and Devices

et al. 2021

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The possibility to tune the magnetic properties of materials with voltage (converse magnetoelectricity) or to generate electric voltage with magnetic fields (direct magnetoelectricity) has opened new avenues in a large variety of technological fields, ranging from information technologies to healthcare devices and including a great number of multifunctional integrated systems such as mechanical antennas, magnetometers, radiofrequency (RF) tunable inductors, etc., which have been realized due to the strong strainmediated magnetoelectric (ME) coupling found in ME composites. The development of singlephase multiferroic materials (which exhibit simultaneous ferroelectric and ferromagnetic or antiferromagnetic orders), multiferroic heterostructures, as well as progress in other ME mechanisms, such as electrostatic surface charging or magneto-ionics (voltage-driven ion migration) have a large potential to boost energy efficiency in spintronics and magnetic actuators. This paper focuses on existing ME materials and devices and reviews the state of the art in their

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Section: Electric-field Control Of Magnetismmentioning

confidence: 99%

Roadmap on Magnetoelectric Materials and Devices

et al. 2021

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“…Previous studies have shown that the strainmediated ferromagnetic/ferroelectrical (FM/FE) multiferroic heterostructure is an efficient way to realize the electric field manipulation of magnetic vortex. [8,9,[17][18][19] In such a system, the E-induced switching of FE polarization in the FE layer generates an in-plane strain, which can be transferred to the FM layer and is experimentally demonstrated to exert a significant influence on the magnetic vortex. [7,9,18] This mechanism is widely known as the strain-mediated magnetoelectric coupling (MEC) effect.…”

Section: Introductionmentioning

confidence: 99%

Electric Field‐Driven Rotation of Magnetic Vortex Originating from Magnetic Anisotropy Reorientation

Wang

Mehmood

Hou

et al. 2021

Adv Elect Materials

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Magnetic vortex, a flux‐closure spin configuration, has shown potential in future high‐density, low‐power magnetic memories due to their nanoscale size and exotic magneto‐electrical transport properties. Although magnetic vortex can be manipulated by various external stimuli in a controllable way, an electrical field‐induced nonvolatile and deterministic reversal rotation of magnetic vortex is yet to be experimentally established. In this work, electrical field‐induced deterministic reversible rotation of a magnetic vortex is realized based on an epitaxial γ ′‐Fe4N/0.7PbMg1/3Nb2/3O3‐0.3PbTiO3 multiferroic heterostructure. This rotation is nonvolatile and can be triggered by the electric‐field pulse. More importantly, it does not require an assistant magnetic field. Combined experiments and theoretical simulations reveal that the rotation of magnetic vortex originates from the strain‐mediated reorientation of the in‐plane magnetic anisotropy. The results provide an additional degree of freedom for manipulating magnetic vortex, which can open new doors for constructing magnetic vortex‐based memory devices.

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“…Micromagnetic simulations first predicted the possibility to switch between the magnetic vortex and polar states in FeGa nanodots grown onto a ferroelectric PZT substrate. [15] Later on, experimental works showed annihilation of magnetic vortices in Ni disks via uniaxial compressive strain transferred from PMN-PT [43] or BaTiO 3 . [44] Electric-field-assisted switching of magnetic vortex chirality was also shown in Co/PMN-PT.…”

Section: Introductionmentioning

confidence: 99%

“…This adds to other important issues of strain-mediated ME systems, such as clamping effects, mechanical fatigue, high fabrication costs (in the case of PMN-PT) or need of relatively large applied voltages (e.g., 400 V). 43 Among all converse ME effects, magneto-ionics is gaining attention because voltage-driven ion transport between the magnetic material of interest and an ion source/sink allows for a stringent non-volatile control of interfacial magnetism to an unprecedented extent. [25,48,49] Upon electrolyte gating, the ions may form diffusion channels or even uniform migration fronts (eventually developing new interfaces within the actuated films), resulting in unique magnetic characteristics (in e.g., oxides or nitrides).…”

Section: Introductionmentioning

confidence: 99%

Magneto-ionic suppression of magnetic vortices

Chen

Nicolenco

Molet

et al. 2021

Science and Technology of Advanced Materials

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Magneto-ionics refers to the non-volatile control of the magnetic properties of materials by voltage-driven ion migration. This phenomenon constitutes one of the most important magnetoelectric mechanisms and, so far, it has been employed to modify the magnetic easy axis of thin films, their coercivity or their net magnetization. Herein, a novel magneto-ionic effect is demonstrated: the transition from vortex to coherent rotation states, caused by voltage-induced ion motion, in arrays of patterned nanopillars. Electrolyte-gated Co/GdO x bilayered nanopillars are chosen as a model system. Electron microscopy observations reveal that, upon voltage application, oxygen ions diffuse from GdO x to Co, resulting in the development of paramagnetic oxide phases (CoO x ) along sporadic diffusion channels. This breaks up the initial magnetization configuration of the ferromagnetic pillars (i.e., vortex states) and leads to the formation of small ferromagnetic nanoclusters, embedded in the CoO x matrix, which behave as single-domain nanoparticles. As a result, a decrease of the net magnetic moment is observed, together with a drastic change in the shape of the hysteresis loop. Micromagnetic simulations are used to interpret these findings. These results pave the way towards a new potential application of magnetoelectricity: the magneto-ionic control of magnetic vortex states.

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Voltage-driven annihilation and creation of magnetic vortices in Ni discs

Abstract: Using PEEM to image ferromagnetism in polycrystalline Ni disks, and ferroelectricity in their single-crystal BaTiO3 substrates, we find that voltage-driven 90° ferroelectric domain switching serves to annihilate magnetic vortices via uniaxial compressive strain.

Cited by 10 publications

References 49 publications

Roadmap on Magnetoelectric Materials and Devices

Roadmap on Magnetoelectric Materials and Devices

Electric Field‐Driven Rotation of Magnetic Vortex Originating from Magnetic Anisotropy Reorientation

Magneto-ionic suppression of magnetic vortices

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