Wen Qi-Ye et al 2004 Chinese Phys. Lett. 21 941 doi:10.1088/0256-307X/21/5/050
Wen Qi-Ye, Zhang Huai-Wu, Jiang Xiang-Dong, Shi Yu, Tang Xiao-Li and Zhang Wan-Li
Show affiliationsWe propose a pseudo-spin-valve (PSV) trilayer using amorphous CoNbZr alloy for soft magnetic layers. The giant magnetoresistance (GMR), domain structures and their variation upon thermal annealing are investigated. The GMR effect is not only stable up to 300 degrees C but also enhanced due to the improvement of the interfaces between Cu and magnetic layers. With high annealing temperature, the magnetoresistance (MR) ratio decreases rapidly as a result of serious layer interdiffusion. Dense stripe domains, which disappear after annealing at 300 degrees C for 1 h, are observed in the sandwiched films. It is found that after patterning to elliptic stripe with aspect ratio of 6:1, the trilayers have a single domain and their MR ratio increases. The dynamic MR behaviour under an ac magnetic field indicates that the patterned stripes have good linear MR responses. Therefore, it is believed that the CoNbZr/Cu/Co PSV trilayer have strong potentials for spin-electronic devices including magnetic random access memory.
75.47.De Giant magnetoresistance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Nt Magnetic annealing and temperature-hysteresis effects
Issue 5 (May 2004)
Received 24 December 2003
Wen Qi-Ye et al 2004 Chinese Phys. Lett. 21 941
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