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Barnali Ghosh (Saha)

Barnali Ghosh (Saha)

S.N.Bose National Centre For Basic Sciences, India

Title: Modification of ground state property on size reduction to 1D


Biography: Barnali Ghosh (Saha)


Nanowires, because of their unique one-dimensional like structural characteristics and size effects, exhibit many novel physical properties, that are different from their bulk counterparts. Main motivation of our investigation is to show, how size reduction affects competing interactions in complex oxides and thus, changes their ground state. Magnetization measurement on half doped manganite nanowire shows several magnetic transitions which are different from bulk. Understanding of magnetic transitions done using several experiments like magneto caloric study, Neutron diffraction study, which shows the presence of phase coexistence of magnetic phases (antiferromagnetic and ferromagnetic ).As the experiments are carried out on ensemble of nanowires, question may arise whether the phase coexistence observed in nanowires is due to size dispersion.  To answer this question, instead of ensemble of nanowires, noise spectroscopy study of single nanowire (<50 nm) level is done to demonstrate how the noise spectroscopy can explain the magnetic transitions and phase separation.Field dependent as well as temperature dependent noise spectroscopy study was done on a single nano-wire to avoid the problems of size dispersion with the specific aim of corroborating the magnetic phase transitions as well as phase co-existence at a single NW level. I would discuss briefly on how to grow nano structured material and about the experiments both in ensemble and single nanowire of perovskite oxides. Experiments with single nanowires; mainly on fabrication of single nanowire based devices, using different lithographic techniques challenges would be discussed.

Recent Publications :

  1. Dutta S, Ghatak A, Ghosh B(2016) Manganite (La1-xAxMnO3; A = Sr, Ca) nanowires with adaptable stoichiometry grown by hydrothermal method:  understanding of growth mechanism using spatially resolved techniques. J Mater Sci 51: 9679.
  2. Roy Moulik S, Ghatak A, Ghosh B (2016) Study of surface chemistry and microstructure of TiO2 nanostructures on Pt(111)/Si wafer and FTO glass substrates: A comparative approach, Surface Science651: 175-181.
  3. Roy Moulik S, Ghatak A, Ghosh B (2016) “Pulsed Laser assisted growth of aligned nanowires of WO3: role of interface with substrate. RSc Adv. 6: 31705.
  4. Dutta S, Samanta S, Ghosh B and Raychaudhuri A. K.(2014)” Low-frequency resistance fluctuations in a single nanowire (diameter 45nm) of a complex oxide and its relation to magnetic transitions and phase separation”, Appl. Phys. Lett. 105: 073117.
  5. Roy Moulik S, Samanta S, Ghosh B (2014), “Photoresponse in thin films of WO3 grown by pulsed laser deposition”, Appl. Phys. Lett. 104: 232017.