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
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
Citations
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Phase evolution and magnetic properties study of Fe/Cobalt ferrite nanocomposites
TL;DR: In this article, phase evolution and magnetic properties of Co/α-Fe2O3:1:6 (molar ratio) powder mixtures subjected to high energy milling (30h) followed by annealing in air and subsequent heat-treatment in a reducing atmosphere at 400°C for 20min.
Journal ArticleDOI
Oxidation-controlled magnetism and Verwey transition in Fe/Fe3O4 lamellae
Hung Manh Do,Thi Thu Hong Le,Xuan Phuc Nguyen,Hong Nam Pham,Thi Hong Le Ngo,Trung Hieu Nguyen,Thanh Phong Pham,Manh-Huong Phan,Jozef Kováč,Ivan Škorvánek +9 more
TL;DR: In this paper, the structural and magnetic properties of Fe/Fe3O4 nanocomposites, synthesized by combined high energy ball milling and controlled oxidation, have been studied.
Journal ArticleDOI
Generation of superparamagnetism in metallic α-iron by swift heavy ion irradiation
Ernő Kuzmann,S. Stichleutner,S. Stichleutner,Z. Homonnay,Károly Havancsák,C. U. Chisholm,M. El-Sharif,Vladimir A. Skuratov,A. Nakanishi,Kiyoshi Nomura +9 more
TL;DR: In this article, the effect of swift heavy ion irradiation on electrochemically deposited metallic pure α-iron was studied and the results were discussed in terms of the thermal spike model for the formation of the amorphous phase.
Journal ArticleDOI
Exchange-bias via nanosegregation in novel Fe2–xMn1+xAl (x = –0.25, 0, 0.25) Heusler films
Samer Kurdi,Massimo Ghidini,Massimo Ghidini,G. Divitini,B. Nair,A. Kursumovic,P. Tiberto,Sarnjeet S. Dhesi,Zoe H. Barber +8 more
TL;DR: In this paper, the structural and magnetic properties of nanocrystalline thin films of Fe2−xMn1+xAl (x = −0.25, 0 and 0.25) obtained by sputtering and ex situ post-deposition annealing were studied.
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 paper, 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.
References
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Journal ArticleDOI
Oscillations in exchange coupling and magnetoresistance in metallic superlattice structures: Co/Ru, Co/Cr, and Fe/Cr.
TL;DR: Mise en evidence d'un interaction d'echange intercouche antiferromagnetique et d'une magnetoconductivite en saturation dans les superreseaux Co/Cr et Co/Ru.
Journal ArticleDOI
Giant magnetoresistance in heterogeneous Cu-Co alloys.
Ami E. Berkowitz,J. R. Mitchell,Matthew J. Carey,A. P. Young,Shufeng Zhang,Frederick E. Spada,F. T. Parker,Andreas Hütten,G. Thomas +8 more
TL;DR: Giant magnetoresistance in heterogeneous thin film Cu-Co alloys consisting of ultrafine Co-rich precipitate particles in a Cu-rich matrix is observed, modeled by including spin-dependent scattering at the interfaces between the particles and the matrix, as well as the spin- dependent scattering in the Co- rich particles.
Journal ArticleDOI
Giant magnetoresistance in nonmultilayer magnetic systems.
TL;DR: The observed isotropic giant magnetoresistance (GMR) in nonmultilayer magnetic systems using granular magnetic solids is shown to occur in magnetically inhomogeneous media containing nonaligned ferromagnetic entities on a microscopic scale.
Journal ArticleDOI
Surface Spin Disorder in NiFe2O4 Nanoparticles.
TL;DR: In this paper, a model of the magnetization within these particles consisting of ferrimagnetically aligned core spins and a spin-glass-like surface layer is proposed, and the qualitative features of this model are reproduced by a numerical calculation of the spin distribution.