My Research Area
  

The recent advancements in nano science has not failed to bring some novel feature associated with ferromagnetic nanofilms. When the thickness of the nanofilm is less than 10nm, new surface magnetic effects and shape anisotropy play a very important role in the magnetization dynamics. So, these ferromagnetic nanofilms have wide application in data writing and in spintronic devices. The key process in the above application is current induced precessional switching, based on spin transfer torque. The magnetization dynamics and switching process in ferromagnetic nanofilms and nanopillars are basically nonlinear in nature and is governed by the Landau-Lifshitz-Gilbert (LLG) equation which is basically a torque equation, with the addition of new spin transfer torque developed due to the flow of spin polarised current. Analytically and numerically solving the above highly nontrivial vector nonlinear evolution equation (LLGS equation) we can understand the underlying magnetization switching dynamics in ferromagnetic nanofilms and nanopillars used in spintronic applications. Presently, I am investigating various ways to reduce the magnetization switching time and the critical current density required to initiate the magnetization switching in different type of nanopillars by solving LLGS Equations.

Research Experience

 

  • Working in the emerging field of Spintronics and my research topic for Ph.D. Degree is “Nonlinear Magnetization Switching Dynamics in Nanostructures”. (Since October 2011).

  • Carried out a project on the topic of “Soliton Spin Excitations in Ferromagnetic Spin Systems ” during a period of two semesters (2010-2011) in the M.Phil Programme.
  • Carried out a project on the topic of “Soliton in Ferromagnets” during a period of two semesters (2009-2010) in the final year of the M.Sc Programme.

Research Papers Published / Communicated

 

  1. D. Aravinthan, P. Sabareesan, and M. Daniel, Current induced magnetization switching in Co/Cu/Ni-Fe nanopillar with orange peel coupling, AIP Advances, 5, 077166 (2015).

  2. D. Aravinthan, P. Sabareesan, and M. Daniel, Impact of biquadratic coupling on critical current density in Co/Cu/Ni-Fe nanopillar, AIP Conference Proceedings, 1728, 020443 (2016).

  3. D. Aravinthan, P. Sabareesan, and M. Daniel, Effect of biquadratic coupling on current induced magnetization switching in Co/Cu/Ni-Fe nanopillar, AIP Conference Proceedings, 1731, 130032 (2016).

  4. D. Aravinthan, P. Sabareesan, and M. Daniel, Reduction of switching time in pentalayer nanopillar device with different biasing, (Manuscript Submitted to J. Magn. Magn. Mater.).

Presentation in Seminars / Conferences / Workshops

 

  1. Presented a poster entitled “Impact of Biquadratic Coupling on Current Induced Magnetization Switching in Co/Cu/Ni-Fe Nanopillar ” in the “2016 Joint MMM - Intermag Conference” held at the Hilton San Diego Bayfront Hotel in San Diego, California, United States during January 11-15, 2016 and jointly sponsored AIP Publishing and IEEE Magnetics Society.

  2. Presented a poster entitled “Effect of Biquadratic Coupling on Current Induced Magnetization Switching in Co/Cu/Ni-Fe Nanopillar” in the “60th DAE Solid State Physics Symposium” held at Amity University U.P., Noida, Uttar Pradesh, India during December 21-25, 2015.

  3. Presented a poster entitled “Impact of RKKY Coupling on Current Induced Magnetization Switching in Nanopillar” in the “International Conference on Nanoscience, Nanotechnology and Advanced Materials (Nanos 2015)” organized by Departmernt of Chemistry, GITAM Institute of Science, GITAM University, Visakhapatnam, Andra Pradesh, India during December 14-17, 2015.

  4. Presented a poster entitled “Impact of Biquadratic Coupling on Critical Current Density in Co/Cu/Ni-Fe Nanopillar” in the “International Conference on Condensed Matter and Applied Physics (ICC 2015)” organized by Govt. Engineering College, Bikaner, Rajasthan, India during October 30-31, 2015.

  5. Presented a poster entitled “Spin Transfer Torque Switching in Pentalayer Nanopillar Having Two Pinned Layers with Biasing” in the “Physics and Applied Mathematics Researchers' Meet – 2015” held at Indian Statistical Institute, Kolkata, India during March 18-20, 2015.

  6. Presented a poster entitled “Spin Transfer Torque Switching in Pentalayer Nanopillar” in the “Indo-Japan Workshop on Magnetism at Nanoscale (IJWMN-2015)” Organized by National Institute of Science Education and Research (NISER), Bhubaneswar, India during January 09-12, 2015.

  7. Presented a poster entitled “Impact of orange peel coupling on magnetization switching in nanopillar” in the eighth “Conference on Nonlinear Systems and Dynamics (CNSD2013)” Organized by Indian Institute of Technology(IIT), Indore, India during December 11-14, 2013.

 

 

 

Research