Journal ArticleDOI
Surface Spin Disorder in NiFe2O4 Nanoparticles.
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TLDR
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.Abstract:
Nickel ferrite nanoparticles exhibit anomalous magnetic properties at low temperatures: low magnetization with a large differential susceptibility at high fields, hysteresis loops which are open up to 160 kOe, time-dependent magnetization in 70 kOe applied field, and shifted hysteresis loops after field cooling. We propose a model of the magnetization within these particles consisting of ferrimagnetically aligned core spins and a spin-glass-like surface layer. We find that qualitative features of this model are reproduced by a numerical calculation of the spin distribution. Implications of this model for possible macroscopic quantum tunneling in these materials are discussed.read more
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The preparation of magnetic nanoparticles for applications in biomedicine
Pedro Tartaj,María del Puerto Morales,Sabino Veintemillas-Verdaguer,T. González-Carreño,Carlos J. Serna +4 more
TL;DR: In this article, a review of state-of-the-art synthetic routes for the preparation of magnetic nanoparticles useful for biomedical applications is presented, with a special emphasis on showing the benefits of using nanoparticles.
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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.
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A mini review of NiFe-based materials as highly active oxygen evolution reaction electrocatalysts
Ming Gong,Hongjie Dai +1 more
TL;DR: In this article, the early discovery and recent progress on NiFe-based OER electrocatalysts in terms of chemical properties, synthetic methodologies and catalytic performances are presented.
Journal ArticleDOI
Finite-size effects in fine particles: magnetic and transport properties
Xavier Batlle,Amílcar Labarta +1 more
TL;DR: In this article, a review of the most relevant finite-size and surface effects in the magnetic and transport properties of magnetic fine particles and granular solids is presented, where the stability of the particle magnetization, superparamagnetic regime and the magnetic relaxation are discussed.
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Ordered magnetic nanostructures: fabrication and properties
TL;DR: The fabrication methods and physical properties of ordered magnetic nanostructures with dimensions on the submicron to nanometer scale are reviewed in this article, where various types of nanofabrication techniques are described, and their capabilities and limitations in achieving magnetic nano-structures are discussed.