Kirandeep Singh
Indian Institute of Technology Roorkee
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Featured researches published by Kirandeep Singh.
Journal of Applied Physics | 2014
Kirandeep Singh; Sushil Kumar Singh; Davinder Kaur
The strain mediated electrical and magnetic properties were investigated in PZT/Ni-Mn-In heterostructure deposited on Si (100) by dc/rf magnetron sputtering. X-ray diffraction pattern revealed that (220) orientation of Ni-Mn-In facilitate the (110) oriented tertragonal phase growth of PZT layer in PZT/Ni-Mn-In heterostructure. A distinctive peak in dielectric constant versus temperature plots around martensitic phase transformation temperature of Ni-Mn-In showed a strain mediated coupling between Ni-Mn-In and PZT layers. The ferroelectric measurement taken at different temperatures exhibits a well saturated and temperature dependent P-E loops with a highest value of Psat ∼ 55 μC/cm2 obtained during martensite-austenite transition temperature region of Ni-Mn-In. The stress induced by Ni-Mn-In layer on upper PZT film due to structural transformation from martensite to austenite resulted in temperature modulated Tunability of PZT/Ni-Mn-In heterostructure. A tunability of 42% was achieved at 290 K (structural...
Applied Physics Letters | 2015
Kirandeep Singh; Davinder Kaur
The ferromagnetic shape memory driven alterations in strain mediated direct and converse magnetoelectric coupling (DME & CME) was realized in sputtered deposited PZT/Ni-Mn-In multiferroic hetero-junctions. The ferroelectric (P-E loops), dielectric (e vs frequency, e-E), and voltage modulated magnetic anisotropy measurements (M-E curves) were executed in the plane (hard axis) and out of the plane (easy axis) of the functional magnetic material based PZT/Ni-Mn-In bilayer structure. A gain of ∼16 μC/cm2 in maximum polarization (Pmax) and ∼12% in tunability (nr) were observed along an easy magnetic axis of Ni-Mn-In. The butterfly shaped normalized magnetization (M/Ms) vs electric field (applied across the heterostructure) [M-E] plots evident the strain character of CME coupling. The co-action of (i) dissimilar carrier concentration between high symmetric austenitic cubic phase and low symmetry martensite phase of ferromagnetic shape memory alloys and (ii) martensitic transformation induced magnetization chang...
Journal of Applied Physics | 2017
Kirandeep Singh; Davinder Kaur
The current study delivers the first assessment of well-separated cone shaped n-type epitaxial BiFe0.9Mn0.1O3 (n-BFMO) shells integrated on LaNiO3 (LNO) buffered vertical arrays of p-type nanoporous Si nanowire cores as an absorber for high efficiency and sustainable all- oxide photovoltaic devices. The photovoltaic effect of the LNO/n-BFMO/Au radial heterojunction is investigated by registering the current-voltage curves under AM 1.5 (100 mW cm−2) illumination conditions at various ferroelectric polarization states of BFMO. The as-deposited LNO/BFMO/Au nanowire arrays fabricated by scalable Pulsed Laser deposition are completely self-polarized and produced a remarkably large open circuit photovoltage up to 0.53 V under zero poling condition. The direction of photocurrent and photovoltage is reversibly switchable in response to ferroelectric polarization switching. The short circuit photocurrent “ISC” and open circuit voltage “VOC” depict a hysteresis loop which is more or less identical to that of ferroe...
Applied Physics Letters | 2017
Kirandeep Singh; Davinder Kaur
This study illustrates the approach to obtain four logic states of ferromagnetic shape memory alloy based multiferroic tunnel junction (MFTJ). In order to achieve giant tunneling electroresistance (TER) and tunneling magnetoresistance (TMR), Ni-Mn-In and Ni-Mn-Sb layers were chosen as electrodes, as well as the concept of the composite barrier was adopted using the STO/PZT [SrTiO3, Strontium Titanate/PbZr0.52Ti0.48O3 (Lead Zirconate Titanate)] (dielectric/ferroelectric) barrier layer. Equated to MFTJ with a single PZT barrier, the introduction of a STO paraelectric (dielectric) barrier is shown to be effective in improving both the TER and TMR of the MFTJs. Particularly, the TER ratio is greatly enhanced by 168% relative TER change: ΔTERTER=TER2−TER1TER1×100. This is described in terms of the increased asymmetry in the electrostatic modulation on the barrier potential profile with respect to the Ferroelectric (FE) polarization direction. We show that due to the coupling between FE polarization and magneti...
Archive | 2017
Kirandeep Singh; Davinder Kaur
The current study explored the investigation of direct strain and charge co-mediated Magnetoelectric (ME) coupling in magnetron sputtered ultra thin PZT /Ni-Mn-In (80 nm/30 nm) multiferroic heterostructure. The evidence of interfacial charges responsible for interaction between FE and FM layers at low thickness regime was manifested from abnormalities of C-V curves from typical butterfly behavior of ferroelectrics, resistance versus voltage plots as well as from magnetodielectric measurements. The signature of strain mediated coupling was evident from the profound variation in maximum polarization (Pmax) with temperature.
Physica B-condensed Matter | 2011
Anshu Gaur; Preetam Singh; Nitin Choudhary; Deepak Kumar; Mohammad Shariq; Kirandeep Singh; Navjot Kaur; Davinder Kaur
Materials Letters | 2016
Narendra Singh; Kirandeep Singh; Akhilesh Pandey; Davinder Kaur
Ceramics International | 2016
Kirandeep Singh; Sushil Kumar Singh; Davinder Kaur
Ceramics International | 2017
Narendra Singh; Kirandeep Singh; Davinder Kaur
Journal of Physics D | 2016
Kirandeep Singh; Davinder Kaur