Academic Positions

  • Present 2013

    Assistant Professor

    University of Hyderabad, School of Physics

  • 2013 2013

    Senior Research Associate (CSIR)

    Indian Institute of Science, Bangalore, India. Department of Physics

  • 2012 2010

    JSPS Postdoctoral Fellow

    Tokyo Institute of Technology, Japan. Materials and Structures Laboratory

  • 2010 2008

    Postdoctoral Fellow

    National Cheng Kung University, Taiwan. Department of Physics

Education & Training

  • Ph.D. 2007

    Ph.D. in Exp. Condensed Matter Physics

    Osmania University, Hyderabad, India.

  • MSc 2002

    Solid State Physics

    Osmania University, Hyderabad, India.

  • BSc2000

    Mathematics, Physics, and Chemistry

    Osmania University, Hyderabad, India

Honors, Awards and Grants

  • 2017
    Associate Fellow
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    Telangana Academy of Sciences, Telangana, India
  • 2017
    Best Poster Award
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    ICMAGMA-2017 at Defence Metallurgical Research Laboratory, India
  • 2013
    Best Poster Award
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    IUMRS-ICA at Indian Institute of Science, India
  • 2013
    Senior Research Associateship
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    Council of Scientific and Industrial Research, India
  • 2010 - 2012
    JSPS Postdoctoral Fellowship
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    Japanese Society for the Promotion of Science, Japan
  • 2008-2010
    Post-doctoral Fellowship
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    National Cheng Kung University, Taiwan
  • 2008
    Awarded Research Associate
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    Council of Scientific and Industrial Research, India
  • 2007
    Awarded Young Scientist
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    Dr K V Rao Scientific Society, Hyderabad, India
  • 2006-2008
    Senior Research Fellowship
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    Council of Scientific and Industrial Research, India.

Previous Results

  1. Strain induced magnetic anisotropy

    Strain induced M_1
    Strain induced M_2
  2. Strain induced magnetization switching

    Strain induced M switcing
  3. Electric field induced magnetic coercivity

    Electric field_1
    Electric field_2

Research Projects (in progress)

  • Manipulation of magnetism in ferromagnetic/ferroelectric multiferroics, Department of Science and Technology, Govt. of India 2015-2018.
  • Electric-field control of magnetism in La1-xSrxMnO3/BaTiO3 heterostructures; Council of Scientific and Industrial Research, Govt. of India, 2016-2019.
  • Interfacial multiferroic magnons: understanding of cross-corelation towards magnonic logic circuit applications; Indo-Japan (DST-JSPS) Collaborative Joint Research Projects, 2019-2021.

Research Projects (Completed)

  • Strain mediated magnetoelectric coupling in ferromagnetic/ferroelectric multiferroics, University Grants Commission, Govt. of India, 2015-2017.
  • Electric field control of magnetoresistance in TMR/ferroelectric heterostructures, Laboratory for Materials and Structures, Tokyo Institute of Technology, Japan, Collaborative Research Projects–2015 & 2016.

Collaborations

  • Prof. Taniyama Tomoyasu, Materials and Structures Laboratory, Tokyo Institute of Technology, Japan.
  • Prof. P. S. Anil Kumar, Department of Physics, Indian Institute of Science, Bangalore, India.

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Electrical conduction mechanism for the investigation of charge ordering in Pr0.5Ca0.5MnO3 manganite system

Anupama Swain and Venkataiah Gorige *
Journal Articles J. Magn. Magn. Mater. 485, 358 (2019)
In the present work, a systematic investigation of electrical transport mechanism has been used as a tool to investigate the charge-order suppression and its crossover in Pr0.5Ca0.5MnO3(PCMO) manganite system with varying particle size and applied magnetic field. The samples with different particle sizes were synthesized by adopting sol-gel method and sintering at different temperatures. The prepared samples were thoroughly characterized by various physicochemical techniques. The activation energy and density of states at Fermi level obtained from the temperature-dependent electrical resistivity data clearly show the charge order crossover signatures and its suppression in the samples below 70 nm particle size and applied magnetic fields above 4 T. The significant change in various electrical transport parameters with the particle size around 70 nm could be attributed to the melting of long-range charge ordering behavior due to surface spin disorder and induced lattice-strain effects in PCMO manganite system.

Irreversible meta-magnetic transition in charge ordered Nd0.5Ca0.5MnO3 manganite

Anupama Swain and Venkataiah Gorige *
Journal Articles Phys. Status Solidi B: Basic Solid State Physics 485, 358 (2019)
The investigation of charge ordering (CO) suppression and consequence effects in manganites are of interest to the scientific community as they help them to understand the interactions among the spin, charge and orbital degrees of freedom of conduction electrons. In this work, the suppression of CO in small bandwidth half-doped manganite, Nd0.5Ca0.5MnO3 (NCMO) has been demonstrated by reducing the particle size. Bulk and nano forms of NCMO materials were prepared by sol-gel technique and characterized by various physicochemical techniques. The magnetic and magnetotransport properties of bulk samples show the exciting features, viz., CO, training and irreversible metamagnetic effects, whereas these features are significantly suppressed in the nanoscale sample. The observed behavior in the present investigation was explained in terms of magnetic phase separation and spin memory effects. Our investigation establishes a combined effect of surface spin disorder and lattice strains for the suppression of CO behavior in NCMO manganite system.

Structural, magnetic and electric properties of multiferroic NiFe2O4-BaTiO3 composites

Prakash Bongurala and Venkataiah Gorige *
Journal Articles J. Magn. Magn. Mater. 477, 350 (2019)
The room-temperature magnetoelastic coupling has been demonstrated in (x)NiFe2O4+(1-x)BaTiO3 (where x = 0-1 with a difference of 0.1) composite system by investigating its structural, magnetic and ferroelectric properties. The samples were prepared by a standard solid-state reaction method and characterized by x-ray diffraction, backscattered scanning electron microscopy and energy dispersive x-ray spectroscopy techniques. The temperature dependent magnetization data clearly show the significant jumps in magnetization curves at structural phase transitions of BaTiO3, signifying the strain-mediated converse magnetoelectric (CME) coupling in NiFe2O4-BaTiO3 multiferroic system. The substantial changes observed in the values of obtained parameters from structural, magnetic and ferroelectric properties clearly ensuring the strain-mediated magnetoelectric (ME) as well as CME effects in this system. The present investigation indicates that the NiFe2O4-BaTiO3 composite system will be a potential candidate for the future low-power consumption device applications at room temperature.

Strain-mediated magnetic response in La0.67Sr0.33MnO3/SrTiO3/La0.67Sr0.33MnO3/BaTiO3 structure

Anupama Swain, Katsuyoshi Komatsu, Mitsuru Itoh, Tomoyasu Taniyama, and Venkataiah Gorige *
Journal Articles AIP Advances 8, 055808 (2018)
Electric field controlled magnetism is an exciting area of condensed matter physics to explore the device applications at ultra-low power consumption compared to the conventional current controlled or magnetic field controlled devices. In this study, an attempt was made to demonstrate electric field controlled magnetoresistance (MR) in a tri-layer structure consisting of La0.67Sr0.33MnO3 (LSMO) (40 nm)/SrTiO3 (10 nm)/LSMO (10 nm) grown on a 500-μm-thick BaTiO3 (001) (BTO) single crystal substrate by pulsed laser deposition technique. Epitaxial growth of the trilayer structure was confirmed by x-ray diffraction measurements. Jumps observed in the temperature-dependent magnetization curve at around the structural phase transitions of BTO ensure the strain-mediated magnetoelectric coupling between LSMO and BTO layers. A significant change in MR of this structure in applied electric fields does not show any polarity dependence. The findings are related to the lattice strain-mediated magnetoelectric coupling in ferromagnetic LSMO/ferroelectric BTO heterostructures.

Magnetization Reversal in Fe/BaTiO3(110)Heterostructured Multiferroics

Venkataiah Gorige * , Anupama Swain, Katsuyoshi Komatsu, Mitsuru Itoh,and Tomoyasu Taniyama
Journal Articles Phys. Status Solidi -RRL (Rapid Research Letters) 11, 1700294 (2017)
Magnetization reversal has been demonstrated in an Fe layer grown on BaTiO3(110) single crystal substrate by utilizing the interface magnetic anisotropy induced by lattice strain and a small magnetic field bias. The polar plots of normalized remanent magnetization show isotropic nature at room temperature (293 K), while those at 230 and 175 K exhibit twofold symmetry with the easy axis oriented along [-111]pc of BaTiO3. Cooling and heating cycles in the range of 150–325 K in an applied magnetic field of -35 Oe along [-111]pc enable to achieve the deterministic 180 degree magnetization reversal, where distinct magnetic anisotropies of Fe associated with different structural phases of BaTiO3 will be the driving force that induces the magnetization reversal. Electric field dependence of the magnetic coercivity shows hysteric behavior, which we attribute to the combined interfacial effect of magnetization rotation in Fe and ferroelectric polarization switching in BaTiO3.

Strain mediated magnetoelectric coupling in NiFe2O4-BaTiO3 multiferroic composite

Venkataiah Gorige * , Raju Kati, D. H. Yoon and P. S. Anil Kumar
Journal Articles J. Phys. D: Appl. Phys. 49, 405001 (2016)
In this paper we demonstrate significant magnetoelectric coupling in ferrimagnetic, NiFe2O4, and ferroelectric, BaTiO3, multiferroic composite bulk materials by measuring temperature dependent magnetization. X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy data show that the two phases coexist with a highly crystalline and sharp interface without any detectable impurities, which enables significant magnetoelectric (ME) coupling. The temperature dependent magnetization data of the composite clearly show the jumps in magnetization curves at the structural phase transitions of BaTiO3, thereby indicating their origin in ME coupling. The change in coercivity of composite sample in different ferroelectric phases of BaTiO3 has been observed compared to the NiFe2O4 sample. The different lattice strains corresponding to different ferroelectric phases of BaTiO3 could be the driving force for modulating the magnetization and coercivity of the composite material. This is clear evidence of strain mediated ME coupling in ferrimagnetic and ferroelectric composite materials.

Effect of Zn substitution on the structural and magnetic properties of Ni-Co ferrites

K. Raju, G. Venkataiah, and D. H. Yoon
Journal Articles Ceramics International 40, 9337 (2014)

Abstract

Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics

G. Venkataiah, E. Wada, H. Taniguchi, M. Itoh, and T. Taniyama
Journal Articles J. Appl. Phys. 113, 17C701 (2013)

Abstract

Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics

G. Venkataiah, E. Wada, H. Taniguchi, M. Itoh, and T. Taniyama
Journal Articles J. Appl. Phys. 113, 17C701 (2013)

Abstract

Magnetic, electric and thermoelectric behavior of electron-doped La1-xSbxMnO3 (x = 0.05, 0.10, 0.15) manganite

G. Venkataiah, J. C. A. Huang, P. V. Reddy
Journal Articles J. Alloys Compd. 562, 128 (2013)

Abstract

Formation of regular magnetic domain patterns with alternating uniaxial and biaxial anisotropy in epitaxial Fe films on BaTiO3

T. H. E. Lahtinen, Y. Shirahata, L. Yao, K. J. A. Franke, G. Venkataiah, T. Taniyama, and S. van Dijken
Journal Articles Appl. Phys. Lett. 101, 262405 (2012)

Abstract

Ferromagnetism in Tb doped ZnO nanocrystalline films

W. Q. Zou, C. N. Ge, G. Venkataiah, H. L. Su, H. S. Hsu, J. C. A. Huang, X.C. Liu, F. M. Zhang, and Y. W. Du
Journal Articles J. Appl. Phys. 111, 113704 (2012)

Abstract

Strain induced reversible and irreversible magnetization switching in Fe/BaTiO3 heterostructures

G. Venkataiah, Y. Shirahata, I Suzuki, M. Itoh, and T. Taniyama
Journal Articles J. Appl. Phys. 111, 033921 (2012)

Abstract

Manipulation of magnetic coercivity of Fe film in Fe/BaTiO3 heterostructure by electric field

G. Venkataiah, Y. Shirahata, M. Itoh, and T. Taniyama
Journal Articles Appl. Phys. Lett. 99, 102506 (2011)

Abstract

Switching of the symmetry of magnetic anisotropy in Fe/BaTiO3 heterostructures

Y. Shirahata, T. Nozaki, G. Venkataiah, H. Taniguchi, M. Itoh, and T. Taniyama
Journal Articles Appl. Phys. Lett. 99, 022501 (2011)

Abstract

Suppression of charge ordering phenomena in nanoscale Nd0.67Ca0.33MnO3 manganite system

K. Raju, G. Venkataiah, D. C. Krishna, Y. K. Lakshmi, and P. V. Reddy
Journal Articles Phys. Lett. A 374, 4937 (2010)

Abstract

Microstructure and magnetic properties of Ni:ZnO nanorod/Zn:NiO nanowall composite structures

G. Venkataiah, M. R. S. Huang, H. L. Su, C. P. Liu, and J. C. A. Huang
Journal Articles J. Phys. Chem. C 114, 16191 (2010)

Abstract

Reduced room-temperature ferromagnetism in intermediate conducting regime of V doped ZnO

S.H. Liu, H.S. Hsu, G. Venkataiah, X. Qi, C. R. Lin, J. F. Lee, K. S. Liang, and J. C. A. Huang
Journal Articles Appl. Phys. Lett., 96, 262504 (2010)

Abstract

Low temperature resistivity minimum and its correlation with magnetoresistance in La0.67Ba0.33MnO3 nano manganites

G. Venkataiah, J. C. A. Huang, and P. V. Reddy
Journal Articles J. Magn. Magn. Mater. 322, 417 (2010)

Abstract

Magnon drag contribution to thermopower of Nd0.67Sr0.33MnO3 nano crystalline manganites

G. Venkataiah, and P. V. Reddy
Journal Articles J. Appl. Phys. 106, 033706 (2009)

Abstract

Magnetoelectric behavior of sodium doped lanthanum manganites

Y.K. Lakshmi, G. Venkataiah, and P. V. Reddy
Journal Articles J. Appl. Phys. 106, 023707 (2009)

Abstract

Variation of thermoelectric power with crystallite size of La0.67Sr0.33MnO3 manganites

G. Venkataiah, and P. V. Reddy
Journal Articles Phase Transitions 82, 156 (2009)

Abstract

Magnetic and electrical behavior of La1-xAxMnO3 (A = Li,Na,K and Rb) manganites

Y. K. Lakshmi, G. Venkataiah, and P. V. Reddy
Journal Articles Physica B 403, 3059 (2008)

Abstract

Electrical transport properties of Nd0.67-xEuxSr0.33MnO3 (0£x£0.67) manganites

G. Venkataiah, and P. V. Reddy
Journal Articles J. Mater. Sci. 43, 4760 (2008)

Abstract

Influence of sintering temperature on resistivity, magnetoresistance and thermopower of La0.67Ca0.33MnO3

G. Venkataiah, Y. K. Lakshmi, and P. V. Reddy
Journal Articles PMC Physics B 1, 7 (2008)

Abstract

Influence of cation mismatch on electrical, magnetic and magnetoresistance properties of Pr0.67A0.33MnO3 manganite system

G. Venkataiah, and P. V. Reddy
Journal Articles Phys. Stat. Sol. (a) 204, 1192 (2007)

Abstract

Influence of particle size on electrical transport properties of La0.67Sr0.33MnO3 manganite system

G. Venkataiah, Y. K. Lakshmi, V. Prasad, and P. V. Reddy
Journal Articles J. Nanosci. Nanotechnol. 7, 2000 (2007)

Abstract

Thermopower studies of Pr0.67D0.33MnO3 manganite system

G. Venkataiah, Y. K. Lakshmi, and P. V. Reddy
Journal Articles J. Phys. D:Appl. Phys. 40, 721 (2007)

Abstract

Anomalous variation of magnetoresistance in Nd0.67-yEuySr0.33MnO3 manganites

G. Venkataiah, V. Prasad, and P. V. Reddy
Journal Articles Solid State Commun. 141, 73 (2007)

Abstract

Electrical behavior of some rare earth doped Nd0.33Ln0.34Sr0.33MnO3 manganites, J. Magn. Magn. Matter. 309, 237 (2007).

K. Padmavathi, G. Venkataiah, and P. V. Reddy
Journal Articles J. Magn. Magn. Matter. 309, 237 (2007)

Abstract

Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites

G. Venkataiah, V. Prasad, and P. V. Reddy
Journal Articles J. Alloys Compd. 429, 1 (2007)

Abstract

Structure and electrical transport of some Cd-doped La0.67Sr0.33MnO3 manganites

G. Venkataiah, V. Prasad, and P. V. Reddy
Journal Articles Phys. Stat. Sol. (a) 203, 2478 (2006)

Abstract

Electrical behavior of some lanthanum based rare earth CMR materials

V. R. Kumari, G. Venkataiah, and P. V. Reddy
Journal Articles Int. J. Mod. Phys. B 19, 3619 (2005)

Abstract

Structural, magnetic and magnetotransport behavior of some Nd-based perovskite manganites

G. Venkataiah, and P. V. Reddy
Journal Articles Solid State Commun. 136, 114 (2005)

Abstract

Effect of sintering temperature on electrical transport properties of La0.67Ca0.33MnO3

G. Venkataiah, D. C. Krishna, M. Vithal, S. S. Rao, S. V. Bhat, V. Prasad, S. V. Subramanyam, and P. V. Reddy
Journal Articles Physica B 357, 370 (2005)

Abstract

Electrical behavior of sol-gel prepared Nd0.67Sr0.33MnO3 manganite system

G. Venkataiah, and P. V. Reddy
Journal Articles J. Magn. Magn. Mater. 285, 343 (2005)

Abstract

Influence of sintering temperature on magnetotransport behavior of some nanocrystalline manganites

G. Venkataiah, Y. K. Lakshmi, and P. V. Reddy
Articles/Chapters in Edited Books Sintering - Methods and Products (ISBN 979-953-307-041-3) InTech-Open Access Publishers, Chapter no. 13, Page no. 267 (2012)

Guest lecture on "Magnetism and its applications"

Magnetism and its applications
Conferences & Guest Lectures Held at Department of Physics, Telangana University (South Campus), Nizamabad, Telangana, India. During October 30, 2014

Abstract

International Conference on Magnetic Materials and Applications (ICMAGMA-2014)

Oral Presentation: Strain mediated magnetoelectric coupling in ferrite-ferroelectric multiferroic composites
Conferences & Guest Lectures Held at Department of Physics, Pondicherry University, Pondicherry, India. During September 15-17, 2014

Abstract

National Conference on Absorption and Magnetic Resonance Spectroscopy and their Integration to Sustainable Human Development” (NCAMRS-SHD-2014)

Invited talk, Electric field control of magnetism: Ultra-low power device applications
Conferences & Guest Lectures Held at Department of Physics, Osmania University, Hyderabad, India. During August 30-31, 2014

Abstract

Internal conference on ‘Advancements in Materials, Health and Safety towards Sustainable Energy & Environment (MHS-2014)

Poster Presentation, Electric field Control of Magnetism in Ferromagnetic/Ferroelectric Heterostructures
Conferences & Guest Lectures Held at Chennai, India. During August 07-08, 2014

Abstract

International Union of Materials Research Society-International Conference in Asia 2013 (IUMRS-ICA 2013)

Poster Presentation, Strain mediated magnetoelectric coupling in NiFe2O4-BaTiO3 multiferroic composite (won best poster award)
Conferences & Guest Lectures Held at IISc, India. During December, 16-20, 2013

Abstract

12th Joint MMM/Intermag Conference

Poster Presentation, Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics
Conferences & Guest LecturesHeld at Chicago, USA. During January 14-18th, 2013

Abstract

The Physical Society Japan 66th Annual Meeting

Poster Presentation, Title: Electric field control of magnetic coercivity of Fe thin film in Fe/BaTiO3 heterostructures
Conferences & Guest Lectures Held at Osaka, JAPAN. During March 24rd - 27th, 2012

Abstract

56th Annual Conference on Magnetism and Magnetic Materials (MMM 2011)

Poster Presentation, Title: Electric field control of magnetic anisotropy in Fe/BaTiO3
Conferences & Guest Lectures Held Scottsdale, Arizona, USA. During October 30-November 3, 2011

Abstract

Currrent Teaching

  • Jan-2020 Jun-2020

    (a) Structure and Properties of Matter (IPYT 602)

    (b) Laboratory-IV (Microwave & Nuclear Physics) (PY552)

Teaching History

  • Jul-2019 Dec-2019

    (a) Solid State Physics Lab(PY505)

    (b) Electronics for All (FN119)

  • Jan-2019 Jun-2019

    (a) Structure and Properties of Matter (IPYT 602)

    (b) Laboratory-IV (Microwave & Nuclear Physics)

  • Jul-2018 Dec-2018

    Electronics (IPYT 502)

  • Jan-2018 Jun-2018

    Structure and Properties of Matter (IPYT 602)

    Physical Constants Measurements Lab (IPYL 606)

  • Jul-2017 Dec-2017

    Electricity and Magnetism Lab (IPYL 302)

  • Jan-2017 Jun-2017

    (a) Basics of Condensed Matter (PY354)

    (b) Laboratory-IV (Microwave & Nuclear Physics)

  • July-2016 Dec-2016

    General Properties of Matter (IPY302)

  • Jan-2016 Jun-2016

    (a) Microwave Laboratory (PY552)

    (b) Probes of Condensed Matter(PY573)

  • Jul-2015 Dec-2015

    (a) Electronic Circuits Laboratory (PY406)

    (b) General Properties of Matter (PY302)

    (c) Electronics lab-SCIS

  • Jan-2015 Jun-2015

    (a) Physical Property Measurements Laboratory (IPY355)

    (b) Microwave Laboratory (PY552)

  • Jul-2014 Dec-2014

    (a) Electronic Circuits Laboratory (PY406)

    (b) Mechanics Laboratory (PY102)

  • Jan-2014 Jun-2014

    Microwave Laboratory (PY552)