MISIS: Magnetic Microconductors for Smart Implants and Contactless Sensors

2024: Introduction of Ultra-Thin Amorphous Micro-Pipelines

Scientists at NITU MISIS presented ultra-thin amorphous micro-pipelines for biomedical contactless sensors and sensor elements embedded in implants. The university announced this on October 15, 2024. This opens up prospects for the manufacture of highly sensitive diagnostic devices and smart implants that can track the emergence of degradation processes, as well as identify the causes of rejection or weakening of implants. Unlike analogues, the presented micro-pipelines are thinner and more cost-effective in production.

NITU MISIS

Ferromagnetic materials have nonlinear properties, that is, when the magnetic field changes, there is no proportional change in the magnetization of the substance. This property is important for the generation of higher harmonics - additional frequencies in the voltage signal, which depend on external influences.

When ferromagnetic micro-wires are in an amorphous state, their magnetic properties are highly dependent on mechanical stress-tension and compression. For example, if the wire is stretched, the energy that determines the direction of magnetization is reduced. As a result, the magnetization of the core reacts more slowly to external magnetic fields and the voltage signal becomes wider, losing high frequencies, "said Nikolai Yudanov, associate professor of the Department of Electronics Materials Technology at NITU MISIS.

Scientists at MISIS University have created glass-coated microconductors based on iron, cobalt, silicon, boron and chromium, which change magnetic properties under mechanical action. The diameter is 30 micrometers, which is thinner than a human hair. To examine microconductors as elements of contactless data collection, a system of flat coils has been developed, with the help of which it is possible to remotely re-magnetize the wire and detect the voltage signal.

We have shown the potential of amorphous micro-pipelines as non-contact sensors for detecting mechanical stresses, which contributes to the development of remote monitoring technologies, for example, mechanical stresses and temperature. The results obtained can serve as the basis for the developed "smart" materials or smart implants, - added Dr. Larisa Panina, Professor of the Department of Electronics Materials Technology, Scientific Consultant of the Laboratory "Intelligent Sensor Systems" NUST MISIS.