Magneto-resistance in sonochemically prepared nano Co100-xCrx alloys (0 ≤ x ≤ 40)

We present the first reports on nano-sized Co100-xCrx alloys (0 # < x # < 40), prepared by the sonochemical decomposition of respective metal-organic precursors. Samples heat-treated at 900 deg C, exhibit a negative magneto-resistance ratio ranging from -1 to -4% at room temperature and at a f...

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Veröffentlicht in:	Solid state sciences 2003-05, Vol.5 (5), p.821-826
Hauptverfasser:	Lata, Rao Manju, Sundar, Manoharan Solomon
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronic transport in mesoscopic or nanoscale materials and structures Electronic transport in multilayers, nanoscale materials and structures Exact sciences and technology Magnetic properties and materials Magnetic properties of nanostructures Metals. Metallurgy Physics
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Zusammenfassung:	We present the first reports on nano-sized Co100-xCrx alloys (0 # < x # < 40), prepared by the sonochemical decomposition of respective metal-organic precursors. Samples heat-treated at 900 deg C, exhibit a negative magneto-resistance ratio ranging from -1 to -4% at room temperature and at a field of 4 Tesla, owing to the tunneling conduction mechanism, while those heat treated at 300 deg C show an MR of about ~2% at 4.2 K and 300 K. Co100-xCrx nano-alloys heat-treated at 300 deg C show an hcp phase, while 900 deg C sintered samples show a pure hcp phase for x = 20 and 30 and a pure hcp phase for x = 40 samples.
ISSN:	1293-2558 1873-3085
DOI:	10.1016/S1293-2558(03)00077-3