Discover Top Posts Tagged with #magnetoelastic

Soft magnetoelastic sensor measures fatigue from eyeball movements in real-time

Over the past few decades, electronics engineers have developed increasingly sophisticated sensors that can reliably measure a wide range of physiological signals, including heart rate, blood pressure, respiration rate and oxygen saturation. These sensors were used to create both biomedical and consumer-facing wearable devices, advancing research and the real-time monitoring of health-related metrics, such as sleep quality and physiological stress. Fatigue, a mental state marked by a decline in performance due to stress, lack of sleep, excessive activity or other factors, has proved to be more difficult to reliably quantify. Most existing methods for measuring fatigue rely on surveys that ask people to report how tired they feel, a method to record the brain's electrical activity known as electroencephalography (EEG) or camera-based systems.

Dramatic stretch in quantum materials confirms 100-year-old prediction

Research from the University of St Andrews has set a new benchmark for the precision with which researchers can explore fundamental physics in quantum materials. The work has implications extending from materials science to advanced computing, as well as confirming a nearly 100-year-old prediction. The researchers explored magnetoelastic coupling, which is the change in the size or shape of a material when exposed to a magnetic field. It is usually a small effect, but one that has technological consequences. A team from the School of Physics and Astronomy at the University of St Andrews has now discovered that this effect is remarkably large in a case where one wouldn't have expected it—in a transition metal oxide. Oxides are a chemical compound containing at least one oxygen atom and one other element in its chemical formula. High-temperature superconductors are one of the most prominent examples of a transition metal oxide.

Iron nitride's magnetoelastic properties show potential for flexible spintronics

The field of spintronics, which integrates the charge and spin properties of electrons to develop electronic devices with enhanced functionality and energy efficiency, has expanded into new applications. Beyond current technologies such as hard disk drive read heads and magnetic random-access memory (MRAM), researchers are now investigating flexible spintronics for use in wearable devices and sheet-type sensors. For these applications, detecting small changes in mechanical stress through electrical resistance modulation is essential. This requires not only materials with significant magnetoresistance effects but also control over their magnetoelastic properties. A research team systematically studied the magnetoelastic properties of Fe4N and its substituted variants, Fe4-xMnxN and Fe4-yCoyN. These materials, composed of widely available elements, were examined for their potential in flexible spintronics.

Bioengineers Develop New Class of Giant Magnetoelastic Effect Human-Powered Bioelectronics

A team of bioengineers at the UCLA Samueli School of Engineering has invented a novel soft and flexible self-powered bioelectronic device. The technology converts human body motions — from bending an elbow to subtle movements such as a pulse on one’s wrist — into electricity that could be used to power wearable and implantable diagnostic sensors.

The researchers discovered that the magnetoelastic effect, which is the change of how much a material is magnetized when tiny magnets are constantly pushed together and pulled apart by mechanical pressure, can exist in a soft and flexible system — not just one that is rigid. To prove their concept, the team used microscopic magnets dispersed in a paper-thin silicone matrix to generate a magnetic field that changes in strength as the matrix undulated. As the magnetic field’s strength shifts, electricity is generated.

Nature Materials published today (September 30, 2021) a research study detailing the discovery, the theoretical model behind the breakthrough, and the demonstration. The research is also highlighted by Nature.

Unusual rare earth compound opens doorway to new class of functional materials

Scientists at the U.S. Department of Energy's Ames Laboratory have discovered an earlier unknown discontinuous magnetoelastic transition in a rare-earth intermetallic. The mechanism of the material's changing magnetic state is so unusual, it provides new possibilities for discovery of similar materials.

Materials that possess magnetoelastic phase transitions are highly sought after for a number of developing technologies, including caloric heating and cooling systems. Materials that display this property are rare, and are thought to be exclusively transition metal-based.

But the Ames Laboratory research group found that a rare earth compound made of Europium and Indium, Eu2In, displayed a startlingly sharp magnetic phase transition accompanied with a giant magnetocaloric effect (change in temperature) and no hysteresis.

"This was a very surprising result and one of the least expected places to find such a phenomenon," said Yaroslav Mudryk, an Ames Laboratory scientist. "So this represents the first example of what potentially may become a new class of materials."

Iron-Gallium Magnetoelastic Energy Source

20 years ago, the Navy created a magnetoelastic material that produced efficient electricity. When this material, Galfenol, is physically impacted, it produces a magnetic fields. Galfenol can produce up to 80 megawatts of power per cubic meter under strong impacts! Not only does this material produce a magnetic field when hit, a magnetic field applied to the material will cause it to change shape…

View On WordPress

#galfenol #iron-gallium #magnetoelastic #nitinol

#magnetoelastic

Trending Tags

Recently Viewed Tags

#magnetoelastic