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Name: Dr. Ghulam Hassnain Jaffari.
Designation: Assistant Professor
Department: Physics


Qualifications:


Phone: +92-51 9064-2010
Email: g_hassnain@yahoo.com
Status: On job
Other Weblink:


Research Interests Publications Conferences Research Projects

Nanophysics and its applications.

Surface magnetism in core/shell, solid and hollow nanoparticles.

Complex Oxides and other correlated electron systems.

Lower dimensional magnetism (thin films and nanoparticles).

Ferroelectric and multiferroic systems.

Heusler Alloys.

Defect induced magnetism in Oxides.

[1] W. Ali, G.H. Jaffari, S. Khan, Y. Liu, Morphological control of 1D and 3D TiO2 nanostructures with ammonium hydroxide and TiO2 compact layer on FTO coated glass in hydrothermal synthesis, Materials Chemistry and Physics, 214 (2018) 48-55.


[2] F. Mumtaz, G.H. Jaffari, Q. ul Hassan, S.I. Shah, Correlation between ionic size and valence state of tetra, penta and hexavalent B-site substitution with solubility limit, phase transformation and multiferroic properties of Bi0. 875Eu0. 125FeO3, Physica B: Condensed Matter, 538 (2018) 213-224.


[3] G. Hassnain Jaffari, A. Tahir, N.Z. Ali, A. Ali, U.S. Qurashi, Effect of Cr-N codoping on structural phase transition, Raman modes, and optical properties of TiO2 nanoparticles, Journal of Applied Physics, 123 (2018) 161541.


[4] G.H. Jaffari, M. Aftab, A. Samad, F. Mumtaz, M. Awan, S.I. Shah, Effects of dopant induced defects on structural, multiferroic and optical properties of Bi1− x Pb x FeO3 (0≤ x≤ 0.3) ceramics, Materials Research Express, 5 (2018) 016103.


[5] A.M. Iqbal, G.H. Jaffari, M. Saleemi, A. Ceylan, Relaxation dynamics and polydispersivity associated with defects and ferroelectric correlations in Ba-doped EuTiO3, Journal of Physics: Condensed Matter, 29 (2017) 465402.


[6] G.H. Jaffari, A. ur Rehman, A.M. Iqbal, M. Awan, M. Saleemi, Extrinsic contributions to the dielectric response in sintered BaTiO3 nanostructures in paraelectric and ferroelectric regimes, Physica B: Condensed Matter, 525 (2017) 70-77.


[7] G.H. Jaffari, W. Mahmood, Investigation of phase evolution and control over phase transformation temperature and thermal hysteresis using stoichiometry and co-doping in VO2 thin films, AIP Advances, 7 (2017) 115312.


[8] S. Hussain, S. Hasanain, G.H. Jaffari, N.Z. Ali, M. Siddique, S.I. Shah, Anomalous temperature dependence of magnetic coercivity and structure property correlations in Bi 0.75 A 0.25 FeO 3 (A= Sr, Pb, and Ba) system, Journal of Materials Chemistry C, 5 (2017) 9451-9464.


[9] G.H. Jaffari, M. Bilal, J.U. Rahman, S. Lee, Formation of multiferroic PbTiO3/PbFe12O19 composite by exceeding the solubility limit of Fe in PbTiO3, Physica B: Condensed Matter, 520 (2017) 139-147.


[10] M.A. Bah, G.H. Jaffari, S.I. Shah, Surface effects on the exchange bias and magnetic irreversibility in hollow polycrystalline NiFe2O4 nanoparticles, Surface and Coatings Technology, 314 (2017) 35-40.


[11] G.H. Jaffari, A. Imran, M. Bah, A. Ali, A.S. Bhatti, U.S. Qurashi, S.I. Shah, Identification and quantification of oxygen vacancies in CeO2 nanocrystals and their role in formation of F-centers, Applied Surface Science, 396 (2017) 547-553.


[12] M.A. Bah, G.H. Jaffari, F. Khan, S.I. Shah, Surfaces and their effect on the magnetic properties of polycrystalline hollow γ-Mn2O3 and MnO nanoparticles, Applied Surface Science, 375 (2016) 136-143.


[13] G. Hassnain Jaffari, M. Aftab, D.H. Anjum, D. Cha, G. Poirier, S. Ismat Shah, Experimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents, Journal of Applied Physics, 118 (2015) 233904.


[14] G.H. Jaffari, A. Tahir, M. Bah, A. Ali, A.S. Bhatti, S.I. Shah, Study of surface-active modes and defects in single-phase Li-incorporated MgO nanoparticles, The Journal of Physical Chemistry C, 119 (2015) 28182-28189.


[15] G.H. Jaffari, A. Samad, A.M. Iqbal, S. Hussain, A. Mumtaz, M.S. Awan, M. Siddique, S.I. Shah, Effect of A and B-site substitution with Pb, La and Ti on phase stabilization and multiferroic properties of BiFeO3, Journal of Alloys and Compounds, 644 (2015) 893-899.


[16] G.H. Jaffari, A.K. Rumaiz, C. Ni, E. Yassitepe, M. Bah, S.I. Shah, Observation of metastable phase separation and amorphous phase in Fe67Co33 alloy thin films synthesized by pulsed laser depositions, Current Applied Physics, 15 (2015) 717-721.


[17] S. Hussain, S. Hasanain, G.H. Jaffari, S.I. Shah, Thickness dependent magnetic and ferroelectric properties of LaNiO3 buffered BiFeO3 thin films, Current Applied Physics, 15 (2015) 194-200.


[18] G.H. Jaffari, M.A. Iqbal, S. Hasanain, A. Ali, A. Bhatti, S.I. Shah, A. Mumtaz, Effect of densification on the ferroelectric response of Ba0. 4Sr0. 6TiO3, Solid State Communications, 205 (2015) 46-50.


[19] S. Hussain, S. Hasanain, G.H. Jaffari, N.Z. Ali, M. Siddique, S.I. Shah, Correlation between structure, oxygen content and the multiferroic properties of Sr doped BiFeO3, Journal of Alloys and Compounds, 622 (2015) 8-16.


[20] A.M. Iqbal, G. Hassnain Jaffari, S.K. Hasanain, Dynamic Response in Ba 1− x Sr x TiO 3 and Anomalous Behavior at the Phase Boundary Composition, Journal of the American Ceramic Society, 97 (2014) 3177-3183.


[21] S.U. Awan, S. Hasanain, G. Hassnain Jaffari, D.H. Anjum, U.S. Qurashi, Defects induced luminescence and tuning of bandgap energy narrowing in ZnO nanoparticles doped with Li ions, Journal of Applied Physics, 116 (2014) 083510.


[22] G.H. Jaffari, Z. Mehmood, A.M. Iqbal, S. Hasanain, S.I. Shah, Development of ferroelectric correlations in the quantum paraelectric and antiferrodistortive regimes in BaxSr1-xTiO3 (x<= 0.10), JOURNAL OF APPLIED PHYSICS, 116 (2014).


[23] S. Ullah Awan, S. Hasanain, G. Hassnain Jaffari, Z. Mehmood, Carrier concentration dependence of ferroelectric transition in multiferroic Li doped and Li-Co co-doped ZnO nanoparticles, Applied Physics Letters, 104 (2014) 222906.


[24] S. Hussain, S. Khurshid Hasanain, G. Hassnain Jaffari, S. Faridi, F. Rehman, T. Ali Abbas, S. Ismat Shah, Size and lone pair effects on the multiferroic properties of Bi 0.75 A 0.25 FeO 3− δ (A= Sr, Pb, and Ba) ceramics, Journal of the American Ceramic Society, 96 (2013) 3141-3148.


[25] M. Aftab, G. Hassnain Jaffari, S. Hasanain, T. Ali Abbas, S. Ismat Shah, Magnetic and transport properties of Co2Mn1− xCrxSi Heusler alloy thin films, Journal of Applied Physics, 114 (2013) 103903.


[26] S.U. Awan, S. Hasanain, M.F. Bertino, G.H. Jaffari, Effects of substitutional Li on the ferromagnetic response of Li co-doped ZnO: Co nanoparticles, Journal of Physics: Condensed Matter, 25 (2013) 156005.


[27] M.M. Can, G.H. Jaffari, S. Aksoy, S.I. Shah, T. Fýrat, Synthesis and characterization of ZnGa2O4 particles prepared by solid state reaction, Journal of Alloys and Compounds, 549 (2013) 303-307.


[28] G.H. Jaffari, H. Lin, A. Rumaiz, E. Yassitepe, C. Ni, S.I. Shah, Comparative surface studies of oxygen passivated FeCo nanoparticles and thin films, physica status solidi (a), 210 (2013) 306-310.


[29] M. Aftab, G.H. Jaffari, S. Hasanain, T.A. Abbas, S.I. Shah, Disorder and weak localization effects in Co2MnxTi1− xAl Heusler alloy thin films, Journal of Physics D: Applied Physics, 45 (2012) 475001.


[30] A. Rumaiz, J. Woicik, C. Weiland, Q. Xie, D. Siddons, G. Jaffari, C. Detavernier, Band alignment in Ge/GeOx/HfO2/TiO2 heterojunctions as measured by hard x-ray photoelectron spectroscopy, Applied Physics Letters, 101 (2012) 222110.


[31] S. Ullah Awan, S. Hasanain, M.F. Bertino, G. Hassnain Jaffari, Ferromagnetism in Li doped ZnO nanoparticles: The role of interstitial Li, Journal of Applied Physics, 112 (2012) 103924.


[32] G.H. Jaffari, A. Ceylan, H.P. Bui, T.P. Beebe Jr, S. Ozcan, S.I. Shah, Non-equilibrium cation distribution and enhanced spin disorder in hollow CoFe2O4 nanoparticles, Journal of Physics: Condensed Matter, 24 (2012) 336004.


[33] G.H. Jaffari, T. Ekiert, K. Unruh, S.I. Shah, Effect of particle size distribution on the magnetic properties γ-Fe2O3 nanoparticles, Materials Science and Engineering: B, 177 (2012) 935-941.


[34] G.H. Jaffari, A. Rumaiz, J. Woicik, S.I. Shah, Influence of oxygen vacancies on the electronic structure and magnetic properties of NiFe2O4 thin films, Journal of Applied Physics, 111 (2012) 093906.


[35] M. Aftab, G. Hassnain Jaffari, S. Hasanain, S. Ismat Shah, Structural and magnetic properties of quaternary Co2Mn1-xCrxSi Heusler alloy thin films, Journal of Applied Physics, 110 (2011) 053903.


[36] G. Hassnain Jaffari, S. Rizwan Ali, S. Hasanain, G. Güntherodt, S. Ismat Shah, Stabilization of surface spin glass behavior in core-shell Fe 67 Co 33–CoFe 2 O 4 nanoparticles, Journal of Applied Physics, 108 (2010) 063921.


[37] E. Yassitepe, Z. Khalifa, G.H. Jaffari, C.-S. Chou, S. Zulfiqar, M.I. Sarwar, S.I. Shah, A new route for the synthesis of CuIn0. 5Ga0. 5Se2 powder for solar cell applications, Powder technology, 201 (2010) 27-31.


[38] S. Anjum, G.H. Jaffari, A.K. Rumaiz, M.S. Rafique, S.I. Shah, Role of vacancies in transport and magnetic properties of nickel ferrite thin films, Journal of Physics D: Applied Physics, 43 (2010) 265001.


[39] M. Coskun, G.H. Jaffari, S. Manzoor, M. Korkmaz, S.I. Shah, Synthesis and magnetic properties of Co–Cr2O3 nanocomposites, Journal of Magnetism and Magnetic Materials, 322 (2010) 1731-1735.


[40] M. Coþkun, M. Korkmaz, T. Fýrat, G. Jaffari, S.I. Shah, Synthesis of SiO 2 coated NiFe 2 O 4 nanoparticles and the effect of SiO 2 shell thickness on the magnetic properties, Journal of Applied Physics, 107 (2010) 09B523.


[41] A.K. Rumaiz, J. Woicik, W. Wang, J. Jordan-Sweet, G.H. Jaffari, C. Ni, J.Q. Xiao, C. Chien, Effects of annealing on the local structure of Fe and Co in CoFeB/MgO/CoFeB tunnel junctions: An extended x-ray-absorption fine structure study, Applied Physics Letters, 96 (2010) 112502.


[42] N. Sharma, G.H. Jaffari, S.I. Shah, D.J. Pochan, Orientation-dependent magnetic behavior in aligned nanoparticle arrays constructed by coaxial electrospinning, Nanotechnology, 21 (2010) 085707.


[43] G.H. Jaffari, A. Ceylan, C. Ni, S.I. Shah, Enhancement of surface spin disorder in hollow NiFe 2 O 4 nanoparticles, Journal of Applied Physics, 107 (2010) 013910.


[44] A.K. Rumaiz, J. Woicik, E. Cockayne, H. Lin, G.H. Jaffari, S.I. Shah, Oxygen vacancies in N doped anatase TiO 2: experiment and first-principles calculations, Applied Physics Letters, 95 (2009) 262111.


[45] G.H. Jaffari, H.-Y. Lin, C. Ni, S.I. Shah, Physiochemical phase transformations in Co/CoO nanoparticles prepared by inert gas Condensation, Materials Science and Engineering: B, 164 (2009) 23-29.


[46] A. Aslam, S. Hasanain, G.H. Jaffari, M. Asim, S. Ali, P. Granitzer, H. Krenn, P. Knoll, W. Lang, Phase separation and stability in Sm0. 50Sr0. 50MnO3: effects of cation dopants, Journal of Physics: Condensed Matter, 20 (2008) 075221.


 


  1. Poster  presentation “Effects of Cation dopant sizes on the magnetic and conducting phases of Sm0.55Sr0.45MnO3 ”, G. Hassnain Jaffari, A. Aslam, and S. K. Hasanain, International Conference organized by Pakistan Institute of Physics, March 13th-16th 2006, held at Physics Department University of Engineering & Technology, Lahore.
  2. Poster presentation “Synthesis of hollow NiFe2O4 nanoparticles based on Kirkendal effect and chemical transformation; Enhanced surface spin disorder”. G. Hassnain Jaffari, A. Ceylan, C. Ni, S. Ismat Shah, 11th Joint MMM-Intermag, January 18-22, 2010, Washington DC, USA.
  3. Poster presentation “Role of cationic/oxygen vacancies in transport and magnetic properties of NiFe2 O4 thinfilms prepared by pulsed laser deposition” G. Hassnain Jaffari, Abdul K. Rumaiz and S. Ismat Shah, Applied Physics Society, March Meeting March 15–19, 2010; Portland, Oregon, USA.
  4. Oral presentation “Enhancement of surface spin disorder in hollow NiFe2O4 nanoparticles, G. Hassnain Jaffari, A. Ceylan, C. Ni, S. IsmatShah , Applied Physics Society, March Meeting, March 15–19, 2010; Portland, Oregon, USA
  5. Oral presentation “Stabilization of surface spin glass behavior in core/shell-Fe67 Co33 /CoFe2 O4 nanoparticles” G. Hassnain Jaffari, S. Rizwan Ali, S. K. Hasanain, Gernot Güntherodt and S. Ismat Shah,  Applied Physics Society, March Meeting, March 21-25, 2011; Dallas, Texas, USA.
  6. Oral presentation, “Electronic structure and magnetic properties of stoichiometric and non-stoichiometric NiFe2 O4 G. Hassnain Jaffari, A. K. Rumaiz, J.C. Woicik, S. Ismat Shah, 56th Annual Conference on Magnetism & Magnetic Materials, Oct 30 – Nov 3, 2011, Scottsdale, Arizona, USA.


Quaid-i-Azam University Islamabad, 45320, Pakistan.
Tel: +92-51 9064 0000, Email:webmaster@qau.edu.pk