Journal ArticleDOI
Properties of nanocomposites of α-Fe and Fe3O4
P. Brahma,Sourish Banerjee,Debabrata Das,P. K. Mukhopadhyay,Sandip Chatterjee,A. K. Nigam,Dipankar Chakravorty +6 more
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TLDR
In this article, a reduction treatment in hydrogen at a temperature of 683 K for a duration from 5 to 40 min is described, where the incorporation of hydrogen atoms during the reduction process appears to break down the precursor oxide particles.About:
This article is published in Journal of Magnetism and Magnetic Materials.The article was published on 2002-04-01. It has received 21 citations till now. The article focuses on the topics: Superparamagnetism & Magnetization.read more
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Exchange bias in nanostructures
Josep Nogués,Jordi Sort,V. Langlais,Vassil Skumryev,Santiago Suriñach,J.S. Muñoz,Maria Dolors Baró +6 more
TL;DR: The phenomenology of exchange bias and related effects in nanostructures is reviewed in this paper, where the main applications of exchange biased nanostructure are summarized and the implications of the nanometer dimensions on some of the existing exchange bias theories are briefly discussed.
Journal ArticleDOI
Exchange bias in ferromagnetic nanoparticles embedded in an antiferromagnetic matrix
Josep Nogués,Jordi Sort,V. Langlais,S. Doppiu,Bernard Dieny,J.S. Muñoz,Santiago Suriñach,Maria Dolors Baró,S. Stoyanov,Yong Zhang +9 more
TL;DR: In this article, the fabrication process and magnetic properties of three types of system consisting of ferromagnetic (FM) particles embedded in an antiferromagnetic matrix are discussed, and the preparation techniques are ball milling, H2 partial reduction of oxides and nanoparticle gas condensation.
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Ferromagnetic resonance and ac conductivity of a polymer composite of Fe3O4 and Fe3C nanoparticles dispersed in a graphite matrix
N. Guskos,E. A. Anagnostakis,Vlassis Likodimos,T. Bodziony,Janusz Typek,M. Maryniak,U. Narkiewicz,I. Kucharewicz,S. Waplak +8 more
TL;DR: Ferromagnetic resonance (FMR) and ac conductivity measurements have been applied to study a polymer composite containing as filler a binary mixture of magnetite (Fe3O4) and cementite nanoparticles (30-50nm) dispersed in a diamagnetic carbon matrix, which was synthesized by the carburization of nanocrystalline iron.
Journal ArticleDOI
Surface effects on magnetic properties of superparamagnetic magnetite nanoparticles
TL;DR: In this article, the authors used a theoretical formalism based on a distribution of diameters or volumes of the nanoparticles, and interpreted each single-domain nanoparticle as a core-shell system with magnetocrystalline anisotropy on the core and surface anisotropic on the shell.
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Water assisted synthesis of MWCNTs over natural magnetic rock: An effective magnetic adsorbent with enhanced mercury(II) adsorption property
TL;DR: In this article, multiwalled carbon nanotubes (MWCNTs) were synthesized over natural magnetic rock as an efficient catalyst in the absence or presence of water vapor and the produced magnetic nanocomposites were employed for mercury(II) adsorption.
References
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Journal ArticleDOI
Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition
TL;DR: In this article, the variation of magnetization as a function of temperature has been analyzed using the Bloch equation and the results show a trend different from that predicted theoretically, which is attributed to an exchange interaction of the iron core with a ferrimagnetic oxide (either Fe 3 O 4 or γ-Fe 2 O 3 ) shell.
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Mössbauer spectra of nanocrystalline Fe and Fe‐Cr particles in sol‐gel‐derived SiO2 glass
TL;DR: In this paper, the Mossbauer absorption patterns consist of a ferromagnetic component superposed on a superparamagnetic doublet, and the intensity of the doublet is found to be larger for particles having smaller average diameter.
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Dependence of exchange anisotropy and coercivity on the Fe-oxide structure in oxygen-passivated Fe nanoparticles
C. Prados,Marta Multigner,Antonio Hernando,J. C. Sánchez,Asunción Fernández,C.F. Conde,A. Conde +6 more
TL;DR: In this article, the antiferromagnetic character of the Fe-oxide surface induces an exchange anisotropy in the ferromagnetic Fe core when the system is field cooled.
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Preparation of nanocomposites containing iron and nickel–zinc ferrite
TL;DR: In this paper, the reduction process appears to break down the particle size of the precursor powder of nickel-zinc ferrite, and a wide range of saturation magnetization and coercivity can be obtained by changing the reduction schedule.
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Mössbauer effect study of metal particle tape stability
TL;DR: Mossbauer spectroscopy was used to examine the stability of two commercial metal particle tapes which had been exposed either to the short-term accelerant Battelle II environment or long-term laboratory ambient atmosphere.