Scientific Directions

way_to_science


 Amorphous ferromagnetic microwires and their systems

Amorphous magnetically soft glass-coated microwires form a part of perspective magnetic materials suitable prospective applications related to coding systems, magnetic field and stresses sensors, and biomedicine [1]. Magnetically bistable microwires have high domain wall velocity (about 2-4 km/s). Magnetic properties and parameters of the domain wall dynamics can be tuned by changing the value and distribution of internal mechanical stresses: changing metallic core diameter and glass thickness, using annealing or applying external stresses. The aim of our laboratory is to establish the mechanisms of micromagnetic structure and magnetic properties formation in order to find novel ways to control the domain wall dynamics.

[1] A. Zhukov, Novel Functional Magnetic Materials: Fundamentals and Applications, Springer, 2016
[2] A. Talaat, J. Alonso, V. Zhukova, E. Garaio, J. A. García, H. Srikanth, M. H. Phan & A. Zhukov, Ferromagnetic glass-coated microwires with good heating properties for magnetic hyperthermia, Scientific Reports 6, 39300, 2016.


Heusler-type magnetic shape memory alloys

Heusler alloys are ordered intermetallic compounds with the generic formula X2YZ, where X and Y are 3d elements and Z is a group IIIA – VA element. Alloys show magnetic properties due to the X or/and Y element.Our laboratory conducting research of Heusler-type alloys properties in form of glass-coated microwires, thin films and ribbons based on Ni-Mn- X (Ga, In, Sn, Sb). These alloy sshow a first-order reversible martensitic transformation (MT) from the high-temperature cubic L2 1 phase (austenite) to a low-temperature phase (martensite) with lower symmetry [1,2], which can be induced by single or multiple effects of heating, stress or magnetic field. It is interesting due to a giant magnetocaloric effect in the vicinity of the transition [3,4] and to significant magnetic field-induced strain [5, 6], which can be interested for energy savingap plications and sensors. Magnetocaloric effect – is a thermodynamic property of magnetic material exposed to a quick variation of external magnetic field that reflects in the change of temperature. The aim of our laboratory is to find the optimal material and conditions for the future potential applications. To achieve this a general knowledge of how martensitic transformation changes due to a transition from micron to sub-micron and nanometer sizes is required.We have been collaborating with different universities: Tohoku University (Sendai, Japan), National University of Science and Technology MISiS (Moscow, Russia), Lomonosov Moscow State University (Moscow, Russia), University of Duisburg-Essen (Germany), (Istituto di Struttura della Materia, (Rome, Italy).

[1] J. Pons, V.A. Chernenko, R. Santamarta, E. Cesari, Acta Materialia, V.48, I.12, 3027-2038 (2000);
[2] S. Kaufmann, U.K. Rößler, O. Heczko, M. Wuttig, J. Buschbeck, L. Schultz, S. Fähler,Physical Review Letters, V.104, I.14, 145702 (2010);
[3] J. Liu, T. Gottschall, K.P. Skokov, J.D. Moore, O. Gutfleisch, Nature Materials 11, 620-626 (2012);
[4] Z. Li, Y. Zhang, C.F. Sanchez-Valdes, J.L. Sanchez Llamazares, C. Esling, Appl. Phys.Lett. 104, 044101 (2014);
[5] H.D. Chopra, C. Ji, V.V. Kokorin, Physical Review B, V.61, I.22, R14913-R14915(2000);
[6] V.A. Chernenko, V.A. L’vov, S.P. Zagorodnyuk, T. Takagi, Physical Review B, V.67,
I.6, 644071-644076 (2003);


Magneto-optics of magnetic and plasmonic nanostructures

Magneto-optical (MO) effects play significant role as a characterization technique and for designing new types of active logic devices or magnetic field sensors. Continuous improvements in nanofabrication and characterization capabilities opened a way of combining magnetic and plasmonic materials. This fact allowed widening the sphere of using the MO effects for application in relatively new spheres like biomedicine due to an effect of enhancement associated with the plasmon resonance [1].Using the MPlCs – multilayer structures fabricated of noble and ferromagnetic layers – allows enhancing MO effects due to excitation of surface plasmon-polaritons (SPPs) and to

Using the MPlCs – multilayer structures fabricated of noble and ferromagnetic layers – allows enhancing MO effects due to excitation of surface plasmon-polaritons (SPPs) and to maximization of adsorption of light in media. Fabrication and investigation of magnetic, optical, magneto-optical properties of MPlCs allows designing a new type of sensor which can be implemented in magnetocardiography [2, 3].The main advantages of such approach in

The main advantages of such approach in field of magnetic field sensors are appearance of resonant enhancement of MO effects expressed in increasing the sensitivity in narrow spectral region and a possibility of scanning the certain volume of MPlCs without changing its position.Our tasks are focused on

Our tasks are focused on investigation of magnetic, micromagnetic, optical and magneto-optical properties of MPlCs and developing ways for precise tuning them by changing parameters of MPlCs.

We are collaborating with Lomonosov Moscow State University (Moscow, Russia), Toyohashi University of Technology (Toyohashi, Japan) and Tokyo Institute of Technology (Tokyo, Japan).

[1] M. Moradi, J. Akerman, et.al., Electron. Mater. Lett., Vol. 11, No. 3, pp. 440-446, 2015
[2] G. Armelles and A. Dmitriev, New Journal of Physics 16, 045012, 2014
[3] A. Kalish and V. Belotelov, Phys. Solid State, Vol. 58, No. 8, pp. 1563–1572, 2016


Multiferroic structures

Multiferroic materials are interesting from both the applied and fundamental points of view: there are many applications in microelectronic, magnetic memory devices, sensor technologies and energy harvesting area and at the same time there are few challenges related, for example, to electric and magnetic properties coupling in these materials. Recently, a lot of attention has been paid to studies of magnetoelectric effect in layered multiferroic structures, which consist of ferroelectric and ferromagnetic phases.

We have been collaborating with Moscow State Technical University of Radio Engineering, Electronics and Automation (Moscow, Russia).


Exchange bias phenomenon

One of scientific directions of research in Laboratory of Novel magnetic materials is study of the exchange bias effect. Although it was discovered more than half of century, still it’s a very hot topic of both fundamental and applied investigations. Nowadays we study exchange bias phenomenon in thin films, but in future several years we plan to expand the area of study of this effect to nanoparticles. All these researchers are motivated by high relevance thanks to wide applications of systems with exchange bias (memory devices, magnetic recording, spintronics, magnetic sensorics and others).

Here, in STP “Fabrika” of IKBFU, we are able to produce and study the samples with mentioned effect. And for the future, we set the aim to apply such systems and materials into devices. For this, we are going to use modern technological methods for creating samples. One of this is actual, worldwide useful and promising method, so-called combinatorial approach. It is a new technique for making of a “library” sample that contains variations of the materials parameter of interest [1].

[1] Green, Takeuchi, and Hattrick-Simpers, J. Appl. Phys.113, 231101, 2013


Magnetic Nanoparticles for Biomedical Application

The magnetic properties are very sensitive to the particle size, being determined by finite size effects on the core properties, related to the reduced number of spins cooperatively linked within the particle, and by surface effects, which become more and more important as the particle size decreases [1]. Due to the unique properties of magnetic nanoparticles and their small size compared to biological objects (typical size of biological cells is 15-100µm) they are used in many fields of biomedicine [2]. For example, the possibility manipulate of MNPs using the gradient magnetic field makes them powerful tool in next application: magnetic drug delivery, separation, tissue engineering, devices “lab-on-a-chip”, etc [3]. The magnetic moment and response on the application of external magnetic field give the possibility to use them for diagnostic and visualization method via measurement of magnetic signal in gradient field (MPI – magnetic particles imaging [4]), for contrast agents in MRI, biosensors, etc. [5]. Heat dissipation by applying a high-frequency alternating field is used in magnetic fluid hyperthermia (MFH) for cancer treatment [1a]. Synthesis and investigation of magnetic properties of nanoparticles, as well as their use in the biomedical application for 3D-construction of tissue and cells structures by using several innovation types of magnetic tweezers ([6] and Fig 1.), are the most perspective direction of scientific activity LNMM. In this research field, LNMM collaborates with Laboratory of Immunology and Cells Biotechnology (IKBFU), Siberian State Medical University (Tomsk, Russia), Institute of Matter Structure (Rome, Italy), Argonne National Laboratory (Chicago, USA).

[1] D. Peddis. in Magn. Nanoparticle Assem. (Trohidou, K. N.) 7, 978–981 (Pan Stanford Publishing, 2014).
[2] a) Pankhurst, Quentin A., et al. “Applications of magnetic nanoparticles in biomedicine.” Journal of physics D: Applied physics 36.13 (2003): R167. b) Pankhurst, Quentin A., et al. “Progress in applications of magnetic nanoparticles in biomedicine.” Journal of Physics D: Applied Physics 42.22 (2009): 224001.
[3] a) van Reenen, Alexander, et al. “Integrated lab-on-chip biosensing systems based on magnetic particle actuation–a comprehensive review.” Lab on a Chip 14.12 (2014): 1966-1986.b) Pamme, Nicole. “Magnetism and microfluidics.” Lab on a Chip 6.1 (2006): 24-38.
[4] a) Bauer, Lisa M., et al. “Magnetic Particle Imaging Tracers: State-of-the-Art and Future Directions.” J. Phys. Chem. Lett 6.13 (2015): 2509-2517. b) Gleich, Bernhard, and Jürgen Weizenecker. “Tomographic imaging using the nonlinear response of magnetic particles.” Nature 435.7046 (2005): 1214-1217.
[5] Lee, Hakho, et al. “Recent developments in magnetic diagnostic systems.” Chemical reviews 115.19 (2015): 10690-10724.
[6] Bessalova, Valentina, Nikolai Perov, and Valeria Rodionova. “New approaches in the design of magnetic tweezers–current magnetic tweezers.” Journal of Magnetism and Magnetic Materials 415 (2016): 66-71.

Current magnetic tweezers for tissue construction
Figure 1. Prototype of  current magnetic tweezers for biological objects