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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Pogorelov, Yg
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Topics
Publications (10/10 displayed)
- 2019Probing the morphology of epitaxial Fe/MgO discontinuous multilayers by magnetometric techniquecitations
- 2010Effect of Gd substitution on ferroelectric and magnetic properties of Bi4Ti3O12citations
- 2009Correlation Between Ionic Radius of Substituting Element and Magnetic Properties of Bi(1-x)A(x)FeO(3-x/2) (A= Ca, Sr, Pb, Ba) Multiferroics
- 2009Doping strategies for increased performance in BiFeO3citations
- 2008Effect of diamagnetic A2+ substitution on the magnetic and ferroelectric properties of the Bi1-xAxFeO3 multiferroics
- 2008Effect of diamagnetic Ca, Sr, Pb, and Ba substitution on the crystal structure and multiferroic properties of the BiFeO3 perovskitecitations
- 2008Weak ferromagnetism in diamagnetically-doped Bi(1-x)A(x)FeO(3) (A=Ca, Sr, Pb, Ba) multiferroicscitations
- 2007Synthesis and multiferroic properties of Bi(0.8)A(0.2)FeO(3) (A=Ca,Sr,Pb) ceramicscitations
- 2004Peculiar magnetic and electrical properties near structural percolation in metal-insulator granular layerscitations
- 2002Dipolar interactions and anisotropic magnetoresistance in metallic granular systemscitations
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article
Peculiar magnetic and electrical properties near structural percolation in metal-insulator granular layers
Abstract
We study CoFe/Al2O3 multilayers, varying from granular to continuous structure with CoFe nominal thickness (10 Angstromless than or equal totless than or equal to18 Angstrom). Structural percolation takes place at t=t(c)approximate to18 Angstrom, changing from activated to metallic conductance. A sharp anomaly in ac coercivity of magneto-optical Kerr effect and in magnetization M by superconducting quantum interferometer device is found at t=t*approximate to17 Angstrom, interpreted as transition from superferromagnetism (by dipolar coupled CoFe clusters) to exchange ferromagnetism. Onset at t=t* of anisotropic magnetoresistance (AMR) is attributed to skew scattering of bandlike electrons within giant fractal clusters. These structures may cause the observed Barkhausen noises in M and AMR at tapproximate tot*, disappearing at t>t*. (C) 2004 American Institute of Physics.