Projects / Programmes
Controllable broadband electromagnetic-radiation shielding
| Code |
Science |
Field |
Subfield |
| 2.21.00 |
Engineering sciences and technologies |
Technology driven physics |
|
| Code |
Science |
Field |
| 1.03 |
Natural Sciences |
Physical sciences |
electromagnetic radiation, absorption, active protection, broadband frequency range
Data for the last 5 years (citations for the last 10 years) on
April 25, 2024;
A3 for period
2018-2022
Data for ARIS tenders (
04.04.2019 – Programme tender,
archive
)
| Database |
Linked records |
Citations |
Pure citations |
Average pure citations |
| WoS |
385 |
8,823 |
7,763 |
20.16 |
| Scopus |
387 |
9,487 |
8,407 |
21.72 |
Researchers (9)
Organisations (1)
| no. |
Code |
Research organisation |
City |
Registration number |
No. of publicationsNo. of publications |
| 1. |
0106 |
Jožef Stefan Institute |
Ljubljana |
5051606000 |
90,742 |
Abstract
Background: The electromagnetic (EM) radiation emitted from man-made sources is becoming increasingly disturbing, as the number of electronic devices is exceedingly growing. The corresponding EM spectrum spreads from several kHz, e.g., naval communication, up to hundreds of GHz, used in satellite communication. Moreover, while the integrated circuits are becoming denser and, hereby, stronger sources of EM radiation, their small dimensions make them increasingly vulnerable to the intrusive EM radiation. In the majority of cases disturbing EM radiation can be avoided with the use of the EM radiation shielding that assures a permanent EM-radiation protection. However, when the need for high sensitivity and strong radiation alternates, e.g., in a transmitting/receiving mode of a cell phone or in surveillance and sensing applications, a possibility to control the shielding effectiveness would be highly appreciated. Objectives: Here we propose a development of a broadband (kHz-THz) EM-radiation shielding that can be activated on demand. The originality of the proposal is to exploit the remarkable absorption properties of the magnetic multilayers. The breakthrough is to introduce an external control of the EM-radiation absorption in the surface coating, which is currently unavailable. In particular, our recent discovery showed that a type of magnetic single crystals – the so-called layered metamagnets – in the applied magnetic field absorb EM radiation in an extremely wide frequency range, i.e., between 1 kHz and 500 GHz at 30 K. Considering the high level of the multilayer-growth technology, progress beyond state-of-the-art should be possible by synthesis of artificial metamagnets that mimic the response of a single crystal already at room temperature. Most importantly, this approach allows for a high degree of tunability; for instance, tuning of the interlayer coupling sets the strength of the magnetic field required to switch-on the absorbing phase. As a result, the desired EM-radiation absorption could be achieved at exactly determined temperature and magnetic fields. Approach: Our project consists of three stages. In the first stage, we will optimize the synthesis of the metamagnetic multilayers by tuning the material and thickness parameters, in order to achieve a broadband EM-radiation absorption at room temperature. In the second stage, we will explore the corresponding magnetic phase diagram and excitations as a function of the magnetic field, which will allow us to identify and explain the main absorbing mechanisms. Finally, we will produce a prototype of an active EM-radiation shielding composed of metamagnetic multilayers deposited on a surface coil array that will enable switching between the absorbing and non-absorbing magnetic states. Impact: Active control of the EM-radiation absorption will open a completely new field of applications, which include shielding from radiation sources, protection of sensitive electronics and advanced stealth technologies. In a broader picture, it can be foreseen that other research directions may arise, such as development of sophisticated filtering coatings with tuneable frequency range and adaptive surface area.
