Magnetic characteristics and structure of granular Cu90Co10 alloy were investigated in order to explain their relationship with electric transport properties. The annealed sample contains mainly Co-particles with sizes of a few nanometers and some much larger particles or agglomerations, which are not superparamagnetic. It is shown that the ferromagnetic phase contribution to the total magnetization (calculated applying the new, invented method) and differentiated surface to volume ratio of superparamagnetic particles are the main sources of the observed deviation of the magnetoresistance characteristics from that expected theoretically for superparamagnetic particles of equal size
Published in:
Magnetics, IEEE Transactions on
(Volume:35
,
Issue:
5
)
Date of Publication: Sep 1999