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Femtosecond opto-magnetism: Controlling and Harnessing the Fundamental Forces in Magnets

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SEMINAR  

  Key Laboratory of Transparent Opto-functional Inorganic Materials  

  中国科学院透明光功能无机材料重点实验室  

  Femtosecond opto-magnetism:  Controlling and Harnessing the Fundamental Forces in Magnets  

  Speaker  

  A. V. Kimel  

  Radboud University Nijmegen, Institute for Molecules and Materials, The Netherlands  

  时间:2015年11月26日 下午3:30  

  地点:4号楼3楼会议室  

  联系人:武安华研究员(52414242) 

  Abstract: 

  The idea to change properties of media with the help of light has long intrigued people in physics and chemistry. Understanding the mechanisms leading to photo-induced magnetic phenomena is a particularly intriguing problem as the strongest perturbation in light-matter interaction - the effect of the electric field of light on electric charges - conserves the spin.  In my talk I will discuss how to control spins in magnets with the help of femtosecond laser pulses. It will be shown that the laser pulses can effectively manipulate spins via ultrafast effect on spin-orbit  and exchange interactions in magnetic materials. The effects are truly non-dissipative being observed even if the laser pulse is not absorbed [4]. I will also discuss scenarios in which the strength of the opto-magnetic effects can be employed to achieve ever faster magnetic switching. 

  References: 

  1. A. V. Kimel, A. Kirilyuk, P.A. Usachev, R.V. Pisarev, A.M. Balbashov and Th. Rasing, Nature 435, 655 (2005).  
  2. I. Radu, K. Vahaplar, C. Stamm, T. Kachel, N. Pontius, H. A. Durr, T. A. Ostler, J. Barker, R.  F.  L.  Evans, R. W.  Chantrell, A.  Tsukamoto, A.  Itoh, A. Kirilyuk, Th. Rasing, and A.  V.  Kimel: Nature 472 205-208 (2011).  
  3. T. A. Ostler, J. Barker, R. F. L. Evans, R. W. Chantrell, U. Atxitia, O. Chubykalo-Fesenko, S. El Moussaoui, L. Le Guyader, E. Mengotti, L. J. Heyderman, F. Nolting, A. Tsukamoto, A. Itoh, D. Afanasiev, B. A. Ivanov, A. M. Kalashnikova, K. Vahaplar, J. Mentink, A. Kirilyuk, Th. Rasing, A.V. Kimel, Nature Com. 3, 666 (2012). 
  4. A. V. Kimel, B. A. Ivanov, R. V. Pisarev, P. A. Usachev, A. Kirilyuk and Th. Rasing: Nature-Physics 5 727 (2009).  
  5. A. V. Kimel, A. Kirilyuk, A. A. Tsvetkov, R. V. Pisarev and Th. Rasing, Nature 49, 850 (2004). 
 
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