Naslov
Detection of the magnetization reversal in submicronic Co particles by GMR measurements

Autori
Cros, Vincent ; Lee, Shan-Fan ; Faini, Giancarlo ; Cornette, Andre ; Hamzić, Amir ; Fert, Albert

Izvornik
Journal of Magnetism and Magnetic Materials (0304-8853) 165 (1997); 512 - 515

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
thin films-trilayer; fine particles; magnetization reversal; giant magnetoresistance

Sažetak
Co particles were obtained by patterining trilayers such as Co/Cu/Co and NiFe/Cu/Co grown by sputtering. Using elecronic lithography, we can design on these layers a microsensor for transport measurements and a Co particle on the top layer. The Co particle and the sublayers form a spin-valve structure due to their different coercitivity. We used GMR measurements to detect the magnetization reversal in Co particles with sizes between 100 x 50 micro m^2 and 180 x 20 nm^2. We present the size dependence of the GMR ratio and of the reversal magnetic field. For the smallest size, we do not find a Stoner-Wolfahrt rotation (i.e. uniform rotation) of the Co particle magnetization, but GMR displays staircase curves indicating discrete variation of this magnetization.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA