 
          
             B. Verkin Institute for Low
            Temperature Physics & Engineering of Ukrainian Academy of Sciences,
            47, Nauky Ave., 
61103 Kharkov, Ukraine
          
          
            
            kovalev@ilt.kharkov.ua
          
          
             
            +38 (057) 340 21 05.
          
        
          
      
          Awards:
          
          - 
            State Prize of Ukraine in the field of science and technology, 2014
          
- 
            O.S.Davydov Prize of the Presidium of the National Academy of Sciences of Ukraine, 2006
          
- 
            Diploma of the K.D.Synelnikov scholarship holder in the field of science of the Kharkiv 
            Regional State Administration, 2015
          
- 
            Diploma of the Verkhovna Rada of Ukraine for services to the Ukrainian people, 2010
          
- 
            Honors of the National Academy of Sciences of Ukraine "For professional achievements", 2018
          
- 
            Honors of the National Academy of Sciences of Ukraine "For preparation of 
            scientific change", 2025
          
- 
            Medal of V.N.Karazin of the Kharkiv National University, 2025
          
   
        
        Languages:
        
          Ukrainian, Russian, English
        
          
     
        Education:
        
          
            
              | Name of Institution | Degrees | Field | 
          
          
        
          
            | B.Verkin Institute for Low Temperature Physics
              and Engineering of the National Academy of Sciences of Ukraine | Professor (2002) | Theoretical Physics | 
        
        
          
            | B.Verkin Institute for Low Temperature Physics
              and Engineering of the National Academy of Sciences of Ukraine | Senior Researcher (2000) | Theoretical Physics | 
        
        
            
              | Institute for Low Temperature Physics
                and Engineering (Kharkiv) | Doctor of Sciences (1990) | Theoretical and Mathematical Physics | 
        
        
          
            | Institute for Low Temperature Physics
              and Engineering (Kharkiv) | PhD Phys & Math (1975) | Theoretical and Mathematical Physics | 
        
        
          
            | Kharkov State University | Part-time postgraduate studies (1973-1975) | Theoretical Physics | 
          
        
        
          
            | Kharkov State University | M.Sc. (1967) | Theoretical Physics | 
          
        
           
       
        Field of Scientific Interest:
        
          Theoretical condensed matter physics, nonlinear mechanics, 
          nonlinear dynamics of elastic media, nonlinear mechanics of 
          magnetically ordered media, theory of dynamical and 
          topological solitons, asymptotic methods of nonlinear physics.
        
        
        Main Achievements:
        
          - 
          The theory of dynamic crowdions in an elastic medium was constructed 
          (with A.M. Kosevich). 
        
- 
          Asymptotic methods for the analysis of soliton dynamics in condensed
           matter physics were developed (with A.M. Kosevich). 
        
- 
          New types of nonlinear excitations in magnetics were proposed and 
           theoretically investigated: magnetic skyrmions, disclinations 
           associated with dislocations and steps on the surface, nonlinear 
           surface spin waves and solitons. 
        
- 
          The concept of magnetic solitons 
           as the bound states of a large number of magnons was developed 
           (with A.M. Kosevich and B.O. Ivanov).
        
- 
          The theory of the dynamics of 
           magnetic vortices and their interaction with each other, with defects 
           and magnons was developed as well.
        
- 
           The nature of the exchange bias 
           phenomenon and its connection with the classification of possible 
           magneto-field dependences were theoretically investigated.
        
 
      
        Professional Experience:
        
          Work at foreign universities (1-3 months per year) as a visitor:
        
        
        - 
          Sweden, Linköping University, 2003, 2005.
        
- 
          United Kingdom, University of Birmingham, 2004.
        
- 
          Poland, Universities of Warsaw and Białystok, 2002
        
- 
          France, University of Paris-6, 1997, 2002.
        
- 
          Germany, Universities of Regesburg and Bayreuth, annually, 1993-2002. 
        
- 
          Australia, University of Canberra, 1997-1998
        
          Associate Editor-in-Chief of Fizyka Nyzkykh Temperatur
        
        
      
        
          Educational activity:      
        
        Scientific adviser of 7 PhDs and 1 DSc..
        
          Part-time professor at the V.N. Karazin Kharkiv National University, 2001-present
        
        
          Teaching lectures on nonlinear physics for postgraduate students of ILTPE of NAS of Ukraine, 2002-2005
        
        
          Teaching a general course in theoretical mechanics and a special course in the theory of nonlinear 
          oscillations, waves and structures for students of Kharkiv National University. 1990-2005
        
        
          Part-time lecturer at the V.N. Karazin  Kharkiv National University, 1990-2001
        
        
          Publication of the V.N. Karazin  Kharkiv National University textbooks on classical 
          mechanics and the theory of nonlinear oscillations, 2012, 2013, 2016, 2018.
        
         
      
        Publications:
        Number of papers: 215 (in the refereed journals - 200)
        Selected Publications for the last 10 years:  
        
          - 
            A.S. Kovalev. Dynamics of magnetic vortices in the field of local inhomogeneity 
            of a ferromagnet" // Fizika Nizkikh Temperatur/Low Temperature Physics, 
            2024, v.50, N 2, 125-132 / 117–124 
            
          
- 
            A.S. Kovalev, E.V. Ezerskaya. Dissipative nonlinear dynamics of ferromagnetic bilayer // Fizika Nizkikh 
            Temperatur/Low Temperature Physics, 2024, v.50, N 10, 968-972 / 968-972 
            
          
- 
            A.S. Kovalev, “Nonlinear dynamics of magnetic multilayers and low- dimensional magnets. 
            I. Easy-plane magnetic anisotropy”, LTP, 49, N10, 1122-1136, 2023.
            
          
- 
            A.S. Kovalev, E.V. Ezerskaya, L.R. Krbashyan, “Nonlinear dynamics of magnetic multilayers. 
            II.Antiferromagnetic interlayer interaction”, LTP, 49, N12, 1419-1438, 2023. 
            
          
- 
            A.S. Kovalev, A.A. Peretyatko, “Nonlinear dynamics of the magnet with localized 
            high-frequency external impact”, LTP, 48, N12, 1071-1086, 2022. 
            
          
- 
            A.S. Kovalev, “Magnetic vortices in media with spatially inhomogeneous exchange interaction”, 
            LTP, 47, N9, 774-483, 2021. 
            
          
- 
            A.S. Kovalev, ”Resonance properties of magnetic helical structures”, LTP, 46, N7, 704-711, 2020 
            
          
- 
            A.S. Kovalev, Y.E. Prilepskii, “Dynamics of pair of coupled nonlinear systems.I.Magnetic systems”, 
            LTP, 46, N8, 856-862, 2020
            
          
- 
            A.S. Kovalev, Resonant properties of domain walls in low-dimension antiferromagnets, 
            LTP,  44, N1, 69–72, 2018 
            
          
- 
            A.S. Kovalev,  J.E. Prilepskii, Interaction of magnetic vortices with defects, 
            LTP,. 44, N7, 663–670, 2018 
            
          
- 
            A.S. Kovalev, The vortex structure of magnetic solitons, LTP,. 43, N2, 274–283, 2017 
            
          
- 
            A.S. Kovalev, V.L. Pankratova, M. Zukovic, Understanding of Exchange Bias in 
            Ferromagnetic/Antiferromagnetic Bilayers, in “Exchange Bias: From Thin Film 
            to Nanogranular and Bulk Systems”, Monograph Series in Physical Sciences, Taylor 
            & Frances Inb. CRC Press, 205-233, 2017.
          
- 
            V.I. Belan; A.S. Kovalev; A.A. Peretyatko, Properties of quasi-soliton states in nonlinear 
            media under local high-frequency irradiation. Analytic description and comparison with 
            numerical simulations, LTP, 42, N12, 1130–1138, 2016
            
          
- 
            M.L.Pankratova; A.S. Kovalev, Model of exchange bias in a trilayer FM/AFM/FM structure, 
            LTP, 41, N10, 838–844, 2015