by Elizaveta V. Golubeva, Ural Federal University, Ekaterinburg
19.12.2018, 16:00 h, TF, Aquarium
The giant magnetoimpedance effect (GMI) is the change of the overall impedance of a ferromagnetic conductor upon application of an external magnetic field. The GMI phenomenon can be explained simplified with the classical skin effect and the dependency of the skin depth on the magnetic permeability of the sample. The effect has a very high sensitivity to changes in both magnetic properties of the sample and external magnetic fields . Therefore, GMI is very promising in applications for various sensing purposes and sample analysis . An example application of GMI is the detection of magnetic labels, such as magnetic nanoparticles (MNPs) embedded in living tissue or injected in blood flow. The basic idea is to magnetize the superparamagnetic NPs with a magnetic field to detect their stray fields with a GMI sensor. For several reasons, however, evaluating and measuring the stray fields of MNPs in living tissues is a very complex task. Our group at the Ural Federal University in collaboration with other research groups is pursuing solutions to overcome these challenges and optimize GMI sensors for specific applications.
In this presentation, the origin of the magnetoimpedance effect is discussed in general. An overview of recent applications is given with a focus on the detection of magnetic labels. Recent achievements are discussed and compared.
 N.A. Buznikov, et al., Biosensors and Bioelectronics, 117,366-372, (2018)
 T. Uchiyama, et al., Physica Status Solidi (a), 206, 639–643, (2009)