IITKGP

Amal Kumar Das

Professor

Physics

+91-3222-283824

amal@phy.iitkgp.ac.in

Research Areas

  • Magnetism and Spintronics
          I was working on the growth and characterizations of thin films of semiconductors and ferromagnetic metals during my Ph. D and Post-doctorate. I grew Ge NANOSTRUCTURES on Si and polymer surfaces under HV conditions and studied using X-ray reflectrometry, Raman spectroscopy and atomic force microscopy (AFM). I installed Cantilever Beam Magnetometer (CBM) and Molecular Beam Epitaxy (MBE) techniques under UHV conditions and studied ferromagnet/semiconductor heterostructures for spintronic applications.
 
          Recently I am working on transition metal doped Ge, ZnO & SnO2 based diluted magnetic semiconductor (DMS) and evolution of impurity phases such as ferrites and Sn-doped Fe2O3. I have developed cantilever beam magnetometer (CBM) in our laboratory to study mechanical (stress) and magnetic properties of bulk, nanoparticles, ribbon and thin film. Using optical CBM (ex-situ), we have demonstrated null, positive and negative magnetostrictive strains in a single system of Ni-Zn ferrites. We have studied transport properties of ferromagnet/semiconductor heterostuctures and demonstrated magnetic diodes for spintronic applications. Recently the CBM set is upgraded introducing provision for electric field and demonstrated electric field controlled magnetization in ferromagnetic/Ferroelectric heterostructures.
  • Electric field dependence of junction magnetoresistance in magnetite/semiconductor heterostructure at room temperature H. Aireddy, S. Bhaumik, and A. K. Das By Applied Physics Letters 107 - (2015)
  • On the compressive stress in polycrystalline Volmer-Weber films R. Koch, Dongzhi Hu, and A. K. Das By Physical Review Letters 94 - (2005)
  • Radio Frequency Scanning Tunneling Spectroscopy for Single-Molecule Spin Resonance Stefan Müllegger, Stefano Tebi, Amal K. Das, Wolfgang Schöfberger, Felix Faschinger, and Reinhold Koch By Physical Review Letters 113 - (2014)
  • Radio-frequency excitation of single molecules by scanning tunnelling microscopy Stefan Müllegger, Amal K Das, Karlheinz Mayr and Reinhold Koch By Nanotechnology 25 - (2014)
  • Magnetic Schottky diode exploiting spin polarized transport in Co/p-Si heterostructure A. Sarkar, R. Adhikari, and A. K. Das By Applied Physics Letters 100 - (2012)
  • A versatile cantilever beam magnetometer for ex situ characterization of magnetic materials R. Adhikari, A. Sarkar, and A. K. Das By Review of Scientific Instrumjents 83 - (2012)
  • The cantilever beam magnetometer: A simple teaching tool for magnetic characterization Rajdeep Adhikari, Rakesh Kaundal, Anirban Sarkar, Pushpinder Rana, and Amal K. Das By American Journal of Physics 80 - (2012)
  • Magnetic diode exploiting giant positive magnetoresistance in ferrite/semiconductor heterostructures R. Adhikari, A. Sarkar, G. R. Patta, and A. K. Das By Applied Physics Letters 98 - (2011)
  • Magnetic semiconducting diode of p-Ge1-xMnx/n-Ge layers on silicon substrate S. Majumdar, A. K. Das, and S. K. Ray By Applied Physics Letters 94 - (2009)
  • Fe doped SnO_2 nanoparticles: structure and magnetism R. Adhikari, A. K. Das, D. Karmakar, J. Ghatak By Physical Review B 78 - (2008)

Co-Principal Investigator

  • XPS analysis of samples Various users from Institute and Outside agencies

Ph. D. Students

Niladri Sekhar Kander

Area of Research: Growth and characterization of magnetic thin films for spintronic applications

Safikul Islam

Area of Research: ferromagnetic/ferroelectric heterostructures for spintronic applications using optical cantilever beam magnetometer

Sajib Biswas

Area of Research: Ferromagnet/semiconductor heterostructures for spintronic applications using in-situ cantilever beam magnetometer

Santu Kumar Ghosh

Area of Research: Magnetic and semiconducting devices

Saumen Chaudhuri

Area of Research: Growth and Characterization of Magnetic thin films