Department of Physics

Indian Institute Of Technology Madras , Chennai
Dr. Nirmala R
HSB 117
DESIGNATION

Associate Professor

Ph.D.

IIT Madras

CURRENT RESEARCH INTEREST

Condensed Matter, Experiment: Rare earth intermetallics, Strongly correlated electron systems, Magnetic and transport properties of materials at low temperatures

CONTACT

044 - 2257 4888

nirmala@iitm.ac.in

RESEARCH GROUPS

Low Temperature Physics


 Current Research :



 Recent Publications :

Crystal Structure and Magnetism of Colossal Dielectric Oxides DyxSr2-xTiMnO6 (x=0‚ 0.5)

Rajib Mondal, Kalyan Biswas, Tapas Ghosh, K. Fabitha, M. S. Ramachandra Rao, A. V. Morozkin, A. K. Nigam, S. Quezado, S. K. Malik, and R. Nirmala

Materials Research Express

Volume: 6 Page: 016106

Year: 2019

Observation of Nd ordering in a novel double perovskite Nd2MgRuO6 with weak exchange interaction at B-site

M. P. Sharannia, Paula Kayser, S Savitha Pillai, Brendan J Kennedy, Maxim Avdeev, R. Nirmala and P. N. Santhosh

Journal of Solid State Chemistry

Volume: 259 Page: 73

Year: 2018

Magnetocaloric effect in textured rare earth intermetallic compound ErNi

Aparna Sankar, J. Arout Chelvane, A. V. Morozkin, A. K. Nigam, S. Quezado, S. K. Malik and R. Nirmala

AIP Advances

Volume: 8 Page: 056208

Year: 2018

Magnetocaloric effect across the metamagnetic transition in Dy5Si2Ge2 Single crystal

R. Nirmala, Chan Ik Lee and Yong Seung Kwon

Journal of Magnetism and Magnetic Materials

Volume: 448 Page: 19

Year: 2018

Nanogranular, Melt-Spun Intermetallic Compound SmNi: Magnetocaloric Effect and Large Coercivity

Jinu Kurian, J. Arout Chelvane, A. V. Morozkin, A. K. Nigam, S. K. Malik and R. Nirmala

IEEE Transactions on Magnetics

Volume: 54 Page: 2103004

Year: 2018

On the magnetism and magnetocaloric effect of electron-doped manganite Er0.15Ca0.85MnO3

Moumita Naskar, Sagar Ghorai, S. Prabhakar, R. Rajivgandhi, S. Rayaprol, A. K. Nigam, S. Quezado, S. K. Malik and R. Nirmala

AIP Conference Proceedings

Volume: 1942 Page: 130025

Year: 2018

Magnetocaloric effect in melt-spun Laves phase intermetallic compound HoCo2

R. Rajivgandhi, J. Rajesh Krishna, J. Arout Chelvane, S. Quezado, S. K. Malik and R. Nirmala

Journal of Magnetism and Magnetic Materials

Volume: 448 Page: 351

Year: 2018

Effect of rapid quenching on the magnetism and magnetocaloric effect of equiatomic rare earth intermetallic compounds RNi (R = Gd, Tb and Ho

R. Rajivgandhi, J. Arout Chelvane, S. Quezado, S. K. Malik and R. Nirmala

Journal of Magnetism and Magnetic Materials

Volume: 433 Page: 169

Year: 2017

Spin glass behavior in frustrated quantum spin system CuAl2O4 with a possible orbital liquid state

R. Nirmala, Kwang-Hyun Jang, Hasung Sim, Hwanbeom Cho, Junghwan Lee, Nam-Geun Yang, Seongsu Lee, R. M. Ibberson, K. Kakurai, M. Matsuda, S.-W. Cheong, V.V. Gapontsev and S.V. Streltsov and Je-Geun Park

Journal of Physics: Condensed Matter

Volume: 29 Page: 13LT01

Year: 2017

Magnetic and magnetocaloric properties of the intermetallic compound ErCu2

R. Rajivgandhi, J. Arout Chelvane, and R. Nirmala

AIP Conference Proceedings

Volume: 1832 Page: 130059

Year: 2017

Observation of magnetization and exchange bias reversals in NdFe0.5Cr0.5O3

M. P. Sharannia, Santanu De, Ripandeep Singh, A. Das, R. Nirmala and P. N. Santhosh

Journal of Magnetism and Magnetic Materials

Volume: 430 Page: 109

Year: 2016

Metamagnetism-enhanced magnetocaloric effect in the rare earth intermetallic compound Ho5Ge4

R. Nirmala, A. V. Morozkin, R. Rajivgandhi, A. K. Nigam, S. Quezado and S. K. Malik

Journal of Magnetism and Magnetic Materials

Volume: 418 Page: 118

Year: 2016

Effect of microstructure and texture on the magnetic and magnetocaloric properties of the melt-spun rare earth intermetallic compound DyNi

R. Rajivgandhi, J. Arout Chelvane, A. K. Nigam, Je-Geun Park, S. K. Malik and R. Nirmala

Journal of Magnetism and Magnetic Materials

DOI: 10.1016/j.jmmm.2016.02.052

Year: 2016

Large magnetic entropy change and relative cooling power in the rare earth intermetallic HoCo0.25Ni1.75 compound

Rajib Mondal, R. Nirmala, J. Arout Chelvane and S. K. Malik

Journal of Magnetism and Magnetic Materials

Volume: 393 Page: 376

Year: 2015

Magnetocaloric effect in Rare earth intermetallics: Recent trends

R. Nirmala, A. V. Morozkin and S. K. Malik

Pramana – J. Phys.

Volume: 84 Page: 977

Year: 2015

Magnetic and magnetocaloric properties of rare earth intermetallic compounds HoCo2-xNix (x = 0.75, 1.25)

Rajib Mondal, R. Nirmala, J. Arout Chelvane and A. K. Nigam,

Physica B (2014) In Press.

Year: 2014

Bulk and nanocrystalline electron doped Gd0.15Ca0.85MnO3: synthesis and magnetic characterization

Lakshman Dhal, Chattarpal, R. Nirmala, P. N. Santhosh, T. Geethakumary and A. K. Nigam,

Physica B (2014) In Press.

Year: 2014

Magnetocaloric effect in the rare earth intermetallic compounds RCoNi (R = Gd, Tb, Dy and Ho)

Rajib Mondal, R. Nirmala, J. Arout Chelvane and A. K. Nigam

Journal of Applied Physics 113 (2013) 17A930

Year: 2013

Magnetic and magnetocaloric properties of rare earth intermetallic compound DyCoNi

Rajib Mondal, J. Arout Chelvane and R. Nirmala

AIP Conference series 1447 (2012) 1115

Year: 2012

Size effect on the structural, magnetic, and magnetotransport properties of electron-doped manganite La0.15Ca0.85MnO3

Rini Thomas, Gangadhar Das, Rajib Mondal, R. Pradheesh, R. N. Mahato, T. Geethakumary, R. Nirmala, A. V. Morozkin, J. Lamsal, W. B. Yelon, A. K. Nigam and S. K. Malik

Journal of Applied Physics 111 (2012) 07D729

Year: 2012

Competing magnetic interactions in the intermetallic compounds Pr5Ge3 and Nd5Ge3

R. Nirmala, A. V. Morozkin, A. K. Nigam, Jagat Lamsal, W. B. Yelon, O. Isnard, S. A. Granovsky,K. Kamala Bharathi, S. Quezado, and S. K. Malik

Journal of Applied Physics 109 (2011) 07A716

Year: 2011

Magnetization and neutron diffraction studies on Sr2TiMnO6

Jagat Lamsal, Rajib Mondal, Anil Kumar, K. Kamala Bharathi, P. N. Santhosh, R. Nirmala, A. K. Nigam, W. B. Yelon, S. Quezado, and S. K. Malik

Journal of Applied Physics 109 (2011) 07E329

Year: 2011

First order transition in Dy5Si3Ge: Transport and thermal properties, and first principles calculations

R. Nirmala, Durga Paudyal, V. K. Pecharsky, K. A. Gschneidner, and A. K. Nigam

Journal of Applied Physics 109 (2011) 07A923

Year: 2011

Unusual dielectric response in B-site disordered hexagonal transition metal oxides

Debraj Choudhury, Adyam Venimadhav, Chandrasekhar Kakarla, Kris T. Delaney, P. Sujatha Devi, P. Mondal, R.Nirmala, J. Gopalakrishnan, Nicola A. Spaldin, Umesh V. Waghmare, D. D. Sarma

Applied Physics Letters 96 (2010) 162903

Year: 2010

Magnetic transition in the rare earth intermetallic compound Ce5Ge4: Heat capacity and neutron diffraction studies

R. Nirmala, A. V. Morozkin, Jagat Lamsal, W. B. Yelon, and S. K. Malik

Journal of Applied Physics 107 (2010) 09E308

Year: 2010

Electric and magnetic polarizabilities of B-site size-disordered hexagonal Ln2CuTiO6 (Ln=Y, Dy, Ho, Er and Yb)

Debraj Choudhury, Adyam Venimadhav, Chandrasekhar Kakarla, Kris T. Delaney, P. Sujatha Devi, P. Mondal, R.Nirmala, J. Gopalakrishnan, Nicola A. Spaldin, Umesh V. Waghmare, D. D. Sarma

Physical Review B 82 (2010) 134203

Year: 2010

Magnetic properties of Er1−xDyxAl2 (0£x£1) compounds in low applied fields

R. Nirmala, Durga Paudyal, V. K. Pecharsky, and K. A. Gschneidner, Jr.

Journal of Applied Physics 107 (2010) 09A723

Year: 2010

Understanding the magnetic ground state of rare-earth intermetallic compound Ce4Sb3: Magnetization and neutron diffraction studies

R. Nirmala, A.V. Morozkin, O. Isnard and A.K. Nigam

Journal of Magnetism and Magnetic Materials 321, 188 (2009)

Year: 2009

Magnetic and Magnetocaloric properties of Tb5Si2Sb2

R. Nirmala, A. K. Nigam and S. K. Malik

Solid State Communications 146 (2008) 121

Year: 2008

Tunable magnetocaloric effect in RTi1-xMoxGe (R = Tb, Er) (x = 0, 0.15) Compounds

R. Nirmala and S. K. Malik

Europhysics Letters 80 (2007) 27001

Year: 2007