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Titolo:
Giant magnetoresistance in mechanically alloyed Ag-Cu-Fe alloys
Autore:
Nash, P; Schwarz, RB; Hundley, MF;
Indirizzi:
Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 s Alamos, NM 87545 IIT, Mech Mat & Aerosp Engn Dept, Chicago, IL 60616 USA IIT Chicago IL USA 60616 ch Mat & Aerosp Engn Dept, Chicago, IL 60616 USA
Titolo Testata:
NANOSTRUCTURED MATERIALS
fascicolo: 6, volume: 10, anno: 1998,
pagine: 893 - 907
SICI:
0965-9773(199808)10:6<893:GMIMAA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-PROPERTIES; GRANULAR ALLOYS; CO ALLOYS; FILMS; CR100-XFEX; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Nash, P UnivAlamos,Los Alamos Natl Lab, Div Mat Sci & Technol, Mail Stop K765, Los Univ Calif Los Alamos Natl Lab Mail Stop K765 Los Alamos NM USA 87545
Citazione:
P. Nash et al., "Giant magnetoresistance in mechanically alloyed Ag-Cu-Fe alloys", NANOSTR MAT, 10(6), 1998, pp. 893-907

Abstract

(Ag0.6Cu0.4)(1-x)Fe-x alloys with x =: 0.10, 0.15, 0.20, and 0.25 were prepared by mechanically alloying mixtures of elemental Ag, Cu, and Fe powders. A metastable fee solid solution containing a nanosized distribution of magnetic Fe-rich particles was formed for all compositions. The alloys were characterized in the as-mechanically alloyed (as-MA) condition and after various annealing treatments by X-ray diffraction, magnetic balance measurements, and magnetoresistance measurements. The as-MA alloys show a giant magnetoresistance (GMR-) effect which increases with decreasing temperature. Forx = 0.15, the GMR effect reaches a value Delta rho/rho approximate to 0.2 at a temperature of 4 K and afield of 10 T. The magnetic particles coarsen on annealing above 473K to produce ferromagnetic particles. Annealing for 30 minutes at 573K increases the GMR effect at low magnetic fields. These effects are explained in terms of the proportion of superparamagnetic to ferromagnetic particles and the total particle interfacial area per unit volume. (C) 1998 Acta Metallurgica Inc.

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Documento generato il 27/11/20 alle ore 22:07:57