A.M. Testa
University of Salerno
131 Papers
738 Citations
A.M. Testa is an academic researcher from University of Salerno. The author has contributed to research in topics: Magnetization & Thin film. The author has an hindex of 25, co-authored 130 publications. Previous affiliations of A.M. Testa include Alenia Aeronautica & University of Barcelona.
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Papers
The origin of high critical currents in YBa2Cu3O7-d thin films
Bernard Dam,J.M. Huijbregtse,F.C. Klaassen,R.C.F. van der Geest,G. Doornbos,J.H. Rector,A.M. Testa,S. Freisem,J.C. Martinez,B. Stäuble-Pümpin,R.P. Griessen +10 more
TL;DR: In this paper, the authors make use of a sequential etching technique to address the question of which types of defect are responsible for the high critical currents observed in thin superconductor YBa2Cu3O7−δ.
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Investigation of magnetic properties of interacting Fe2O3 nanoparticles
TL;DR: The magnetic properties of Fe2O3 nanoparticles (average diameter ∅≅3nm) in alumina have been investigated by magnetization measurements as discussed by the authors, which indicate a superparamagnetic behavior of interacting particles, which block with decreasing temperature (the zero-field-cooled susceptibility shows a maximum at T≅145 K) with a distribution of relaxation times.
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Surface effects in noninteracting and interacting γ-Fe2O3 nanoparticles
Elisabeth Tronc,Dino Fiorani,Marc Nogues,A.M. Testa,Franco Lucari,Franco D'Orazio,Jean-Marc Greneche,Wolfgang Wernsdorfer,Natividad Gálvez,Corinne Chanéac,Dominique Mailly,Jean-Pierre Jolivet +11 more
TL;DR: In this article, the dominant role of surface properties and surface-to-core exchange coupling on the static and dynamic properties of γ-Fe 2 O 3 particles (2.7, 4.6 and 8.7 µm) dispersed in a polymer or powdered.
136
Evidence of Cobalt-Vacancy Complexes in Zn 1 − x Co x O Dilute Magnetic Semiconductors
TL;DR: It is concluded that oxygen vacancies play an important role in originating the high temperature ferromagnetism of Zn(1-x)Co(x)O.
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Magnetic properties of ultrafine α-Fe2O3 antiferromagnetic particles
TL;DR: In this article, magnetization, susceptibility, and ESR measurements of finely dispersed α-Fe 2 O 3 grains were studied by means of magnetization and susceptibility and the results showed a superparamagnetic behavior above T b = 145 K (blocking temperature from dc measurements, applying H = 25 Oe) and gave evidence of the antiferromagnetic nature of the particles, bearing a net uncompensated moment.
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