Domain observation and transition from giant magnetoresistance to anisotropy magnetoresistance in Ag1−x(Ni0.8Co0.2)x granular films
✍ Scribed by G. Ni; H. Sang; F. Wang; X.B. Yin; Y.W. Du
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 364 KB
- Volume
- 127
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
A series of Ag 12x ðNi 0:8 Co 0:2 Þ x granular film samples were prepared using an ion-beam cosputtering technique. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were performed to investigate the microstructure of these samples. The results measured using a vibrating sample magnetometer (VSM) show a gradual change from superparamagnetism to ferromagnetism as x increases in these samples. Magnetoresistance was measured using a conventional four terminal method at room temperature. As x increases, a transition from giant magnetoresistance (GMR) to anisotropic magnetoresistance (AMR) has been observed. The stripe-type domains have been observed using magnetic force microscopy (MFM) in the high x samples, and the domains gradually disappear as x decreases. It suggests that the transition from GMR to AMR may result from intergranular interaction (not only dipolar) in the samples as x increases.