Effects of oxidation and cluster distribution on thermal and magnetotransport properties of mechanically alloyed Co–Cu powders.

Name: W. rattanasakulthong.

Organization : Magnet Laboratory, Experimental Physics Research Unit,Walailak University.

Name: Chitnarong Sirisathitkul.

Organization : Magnet Laboratory, Experimental Physics Research Unit,Walailak University.

keyword: Oxidation.

; Cluster distribution.

; Alloyed Co–Cu Powders.

Abstract: Thermal and magnetotransport properties of mechanicallyalloyed Co30Cu70 powders of three different milling times are studied. Both milling and annealing bring about oxidation of the samples. The powders show exothermic behaviors Corresponding to the lattice-recovery process. Different millingtimes and annealing temperatures give rise to different exothermic peaks because of oxidation and the cluster distribution. At room temperature, the compressed powders show, on average, up to 11% giant magnetoresistance (GMR) under 10 kOe with sharp switching. The results may be understood in terms of spin-dependent scattering across Co/oxide/Cu interfaces. Annealing reduces the resistance but does not promote the GMR. By annealing at 400 .C, the GMR is entirely suppressed as the magnetic content is largely replaced by oxides.

มหาวิทยาลัยวลัยลักษณ์

Address: นครศรีธรรมราช (Nakhon Si Thammarat)

Email: clm@wu.ac.th

Name: Thailand National Metal and Materials Technology Center (MTEC Grant No. MT-B-46-MET-48-122-G).

Issued: 2549-03-11

Modified: 2549-03-11

บทความ/Article

BibliograpyCitation : Appl. Phys. A(2005).

eng

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