Discover Top Posts Tagged with #magnetoelectric

Magnetoelectric deflection: Steering magnetic textures with electric fields shows promise for energy-efficient control

Researchers at Paul Scherrer Institute PSI have demonstrated an innovative method to control magnetism in materials using an energy-efficient electric field. The discovery focuses on materials known as magnetoelectrics, which offer promise for next-generation energy technologies, data storage, energy conversion, and medical devices. The findings are published in the journal Nature Communications. With AI and data centers demanding more and more energy, scientists are searching for smarter, greener technologies. That's where magnetoelectric materials come in—special compounds where electric and magnetic properties are linked. This connection lets researchers control magnetism using electric fields, which could pave the way for super-energy-efficient memory and computing devices.

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Flexible, biodegradable and wireless magnetoelectric paper for simple in situ personalization of bioelectric implants

A research team, jointly led by Professors Jiyun Kim, Chaenyung Cha, and Myoung Hoon Song from the Department of Materials Science and Engineering at UNIST, has unveiled the world's first flexible, biodegradable bioelectronic paper with homogeneously distributed wireless stimulation functionality for simple personalization of bioelectronic implants. These innovative materials are made from nanoscale functional materials, and thus can be further customized using simple methods, such as rolling, cutting, inward folding, and outward folding without losing functionality. The research team expects that these results with unprecedented design flexibility can lay a foundation for the low-cost, simple, and rapid personalization of temporary bioelectronic implants for minimally invasive wireless stimulation therapies.

The combination of OLEDs and acoustic antennas creates a light source that could be used for minimally invasive treatment methods.

A research team from the University of St Andrews and the University of Cologne has developed a new wireless light source that might one day make it possible to 'illuminate' the human body from the inside. Such light sources could enable novel, minimally invasive means to treat and better understand diseases that today require the implantation of bulky devices. The study was published under the title 'Wireless Magnetoelectrically Powered Organic Light-Emitting Diodes' in Science Advances.

Low-voltage magnetoelectric coupling in membrane heterostructures

Strain-mediated magnetic coupling in ferroelectric and ferromagnetic heterostructures can offer a unique opportunity for scientific research in low-power multifunctional devices. Ferroelectrics are materials that can maintain spontaneous and reversible electric polarization. Relaxor-ferroelectrics that exhibit high electrostriction are ideal candidates for ferroelectric layer constructs due to their large piezoelectricity. Although the properties of relaxor ferroelectrics are known, their mechanistic origins remain a mystery, giving rise to an enigmatic form of materials. In addition to that, thin films are ineffective from substrate clamping and can substantially reduce piezoelectric in-plane strains. In a new report now published in Science Advances, Shane Lindemann and a research team in materials science, and physics in the U.S. and Korea, displayed low-voltage magnetoelectric coupling in an all-thin-film heterostructure using anisotropic strains induced by the orientation of the material. The team used an ideal ferroelectric layer of Pb(Mg1/3Nb2/3)O3–PbTiO3 abbreviated PMN-PT during this work and coupled it with ferromagnetic nickel overlayers to create membrane heterostructures with magnetization. Using scanning transmission electron microscopy and phase-field simulations, they clarified the membrane response to understand the microstructural behavior of PMN-PT thin films, to then employ them in piezo-driven magnetoelectric heterostructures.

Physicists Discover Strange New Magnetoelectric Effect

In a very unusual way, the electrical and magnetic properties of a particular crystal are linked together — the phenomenon was discovered and explained at TU Wien (Vienna).

Electricity and magnetism are closely related: Power lines generate a magnetic field, rotating magnets in a generator produce electricity. However, the phenomenon is much more complicated: electrical and magnetic properties of certain materials are also coupled with each other. Electrical properties of some crystals can be influenced by magnetic fields — and vice versa. In this case one speaks of a “magnetoelectric effect.” It plays an important technological role, for example in certain types of sensors or in the search for new concepts of data storage.

A special material was investigated for which, at first glance, no magnetoelectric effect would be expected at all. But careful experiments have now shown that the effect can be observed in this material, it only works completely differently than usual. It can be controlled in a highly sensitive way: Even small changes in the direction of the magnetic field can switch the electrical properties of the material to a completely different state.

Tiny, magnetically powered neural stimulator

Tests show 'magnetoelectric' power is viable option for clinical-grade implants

Rice University neuroengineers have created a tiny surgical implant that can electrically stimulate the brain and nervous system without using a battery or wired power supply.

The neural stimulator draws its power from magnetic energy and is about the size of a grain of rice. It is the first magnetically powered neural stimulator that produces the same kind of high-frequency signals as clinically approved, battery-powered implants that are used to treat epilepsy, Parkinson's disease, chronic pain and other conditions.

The research is available online today in the journal Neuron.

The implant's key ingredient is a thin film of "magnetoelectric" material that converts magnetic energy directly into an electrical voltage. The method avoids the drawbacks of radio waves, ultrasound, light and even magnetic coils, all of which have been proposed for powering tiny wireless implants and have been shown to suffer from interference with living tissue or produce harmful amounts of heat.

Magnetoelectric coupling in a paramagnetic ferroelectric crystal demonstrated

An international team of researchers at University of Montpellier, University of Aveiro and University of Coimbra has demonstrated magnetoelectric coupling in a paramagnetic ferroelectric crystal. In their paper published in the journal Science, the group describes the ytterbium-based molecular magnetoelectric material they discovered and its possible uses. Ye Zhou and Su-Ting Han with Shenzhen University have published a Perspective piece describing the work in the same journal issue.

Over the past two decades, scientists have been struggling to produce multiferroic materials. But as Zhou and Han note, despite an enormous amount of effort, researchers have been unable to create such materials that can be used at room temperature. And there have also been problems creating materials with strong enough coupling to be useful in commercial products. In this new effort, the researchers have created a material that might have the characteristics that scientists have been looking for.

Ferroelectricity is a property of certain materials that have an electric polarization that can be reversed by an external electric field. If an electric field is applied to such materials, their dipoles align resulting in polarization. Ferromagnetism is the high susceptibility of certain materials to magnetization. And as in ferroelectrics, if a magnetic field is applied, the material's electron spins are aligned, resulting in magnetism. In this new effort, the researchers created a material with electrical properties that change when exposed to a magnetic field instead of an electrical force at room temperature. The new material also achieves six polarization states by manipulation of the applied electric and magnetic fields.

Magnetoelectric coupling in a paramagnetic ferroelectric crystal demonstrated

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