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A giant magnetocaloric effect across the ferromagnetic (FM) to paramagnetic (PM) phase transition was observed in chemically synthesized Co2FeAl Heusler alloy nanoparticles with a mean diameter of 16 nm. In our previous report, we have…

Strongly Correlated Electrons · Physics 2021-06-15 Aquil Ahmad , Srimanta Mitra , S. K. Srivastava , A. K. Das

Heusler alloy Co2FeAl was employed as ferromagnetic layers in Co2FeAl/Ru/Co2FeAl synthetic antiferromagnet structures. The experimental results show that the structure with a Ru thickness of 0.45 nm takes on strongly antiferromagnetic…

Materials Science · Physics 2015-05-13 X. G. Xu , D. L. Zhang , X. Q. Li , J. Bao , Y. Jiang

In a quest of enriching the area of d0 magnetism in oxide materials, we have undertaken to study Mg-doped TiO2 compounds. The Ti1-xMgxO2 (x=0, 0.02, 0.04 and 0.06) nanoparticles were prepared by solid-state reaction route. The X-ray…

Materials Science · Physics 2020-11-30 L. Chouhan , G. Bouzerar , S. K. Srivastava

In this report, the magnetic behaviour of $NiCr_{2}O_{4}$ bulk and nanoparticle samples under different applied magnetic field has been investigated extensively. Nanoparticles of $NiCr_{2}O_{4}$ were obtained by mechanical milling of…

Strongly Correlated Electrons · Physics 2013-11-26 H. Singh , T. Ono , T. Chakraborty , K. Srikanth , A. Venimadhav , R. Chandra , C. Mitra , U. Kumar

Non-stoichiometric NaxCoO2 (0.5 < x < 1) consists of CoO2 layers made up of edge-sharing CoO6 octahedra, and exhibits strongly anisotropic magnetic susceptibilities as well as metallic properties. A modified Curie-Weiss law was proposed for…

Strongly Correlated Electrons · Physics 2007-05-23 M. -H. Whangbo , D. Dai , R. K. Kremer

The lindgrenite compounds [Cu3(MoO4)2(OH)2] with various architectures and high crystallinity were prepared by a simple surfactant-assisted hydrothermal method. Then, the Cu3Mo2O9 samples were prepared by calcination of the as-synthesized…

Materials Science · Physics 2025-02-11 Azam Bayat , Ali Reza Mahjoub , Mostafa M. Amini

We report on linear and non-linear dielectric property measurements of BaTiO3 - CoFe2O4 (BTO-CFO) ferroelectro-magnetic nano-composites and pure BaTiO3 and CoFe2O4 samples with Scanning Near Field Microwave Microscopy. The permittivity…

Materials Science · Physics 2009-11-11 Yi Qi , H. Zheng , R. Ramesh , Steven M. Anlage

Structural, impedance, ferroelectric and magnetic properties were examined in multiferroic Bi_{2}Fe_{4(1-x)}Co_{4x}O_{9} (0$\leq$x$\leq$0.02) ceramics synthesized via solid-state reaction method. X-ray diffraction analysis and Rietveld…

Materials Science · Physics 2016-05-06 S. R. Mohapatra , B. Sahu , M. Chandrasekhar , P. Kumar , S. D. Kaushik , S. Rath , A. K. Singh

A complex oxalate precursor, CaCu3(TiO)4(C2O4)8.9H2O, was synthesized and the precipitate that obtained was confirmed to be monophasic by the wet chemical analyses, X-ray diffraction, FTIR absorption and TG, DTA analyses. The thermal…

Materials Science · Physics 2013-01-21 P. Thomas , K. Dwarakanath , K. B. R. Varma , T. R. N. Kutty

We report the magnetic properties of mechanically milled Co$_{0.2}$Zn$_{0.8}$Fe$_2$O$_4$ spinel oxide. After 24 hours milling of the bulk sample, the XRD spectra show nanostructure with average particle size $\approx$ 20 nm. The as milled…

Soft Condensed Matter · Physics 2009-11-07 R. N. Bhowmik , R. Ranganathan , S. sarkar , C. Bansal , R. Nagarajan

Experimental and computational studies were performed on Co2FeGe Heusler alloy. It was found that the alloy has very high experimental magnetic moment of 6.1 muB/f.u., curie temperature of 1073K and very high spin-wave stiffness constant of…

Materials Science · Physics 2020-10-20 Srimanta Mitra , Aquil Ahmad , Shamik Chakrabarti , Sajib Biswas , Amal Kumar Das

AI-driven inorganic materials research has garnered significant attention due to its ability to reduce the time, labor, and cost associated with experiments. An AI model known as GNoME, recently developed by Google DeepMind, is particularly…

Materials Science · Physics 2026-03-25 Shuhei Naganuma , Jiro Kitagawa

The possibility of using exchange bias in ferromagnetic-antiferromagnetic system to over come the effect of superparamagnetism in small cobalt nanoparticles is explored. We have prepared Co-Cr2O3 nanocomposite powders using a chemical…

Materials Science · Physics 2009-11-11 P Anil Kumar , K Mandal

The magnetic susceptibility and magnetization of two new layered S=1/2 Heisenberg antiferromagnets with moderate exchange are reported. The two isostructural compounds, (2-amino-5-chloropyridinium)2CuBr4 ((5CAP)2CuBr4) and…

Materials Science · Physics 2009-11-07 F. M. Woodward , A. S. Albrecht , C. M. Wynn , C. P. Landee , M. M. Turnbull

We prepared very high-coercivity cobalt ferrite nanoparticles using short-time high-energy mechanical milling. After the milling process, the coercivity of the nanoparticles reached 3.75 kOe - a value almost five times higher than that…

Mesoscale and Nanoscale Physics · Physics 2015-06-19 E. F. Chagas , A. S. Ponce , R. J. Prado , G. M. Silva , J. Bettini , E. Baggio-Saitovitch

The adsorption of $CO_2$ on the $Fe_3$$O_4$(001)-($\sqrt{2}$ $\times$ $\sqrt{2}$)R45{\deg} surface was studied experimentally using temperature programmed desorption (TPD), electron spectroscopies (UPS and XPS), and scanning tunneling…

Magnetic measurements up to 1000 K have been performed on hydrothermally synthesized $\alpha$-Fe$_{2}$O$_{3}$ nanoparticles (60 nm) using a Quantum Design vibrating sample magnetometer. A high vacuum environment (1$\times$10$^{-5}$ torr)…

Mesoscale and Nanoscale Physics · Physics 2015-05-20 Jun Wang , Wei Wu , Fan Zhao , Guo-meng Zhao

The dielectric properties of Fe$_{3}$O$_{4}$ magnetic nanoparticles with an insulating coating layer of SiO$_{2}$ were investigated. At high temperatures, the changes of the dielectric constant and loss induced by the magnetic field are…

Materials Science · Physics 2011-03-18 C. -C. Chang , L. Zhao , M. -K. Wu

Antiferromagnetic Bi_{2}Fe_{4}O_{9} (BFO), lightly substituted by cobalt is studied for magnetodielectricity. The substitution causes a substantial decrease in the Neel temperature (T_N) from 250 K (in parent sample, BFO) to 152 K (in 2% Co…

Materials Science · Physics 2017-09-19 S. R. Mohapatra , P. N. Vishwakarma , S. D. Kaushik , R. J. Choudhary , N. Mohapatra , A. K. Singh

The use of pressure to obtain new materials that can be recovered under ambient conditions is a central problem in high-pressure physics. Despite decades of research, this goal has only been achieved in the laboratory for a few notable…

Materials Science · Physics 2025-08-19 Reetam Paul , Jonathan C. Crowhurst , Stanimir A. Bonev
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