caa a22 4500 463234596 CHVBK 20180405153252.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-007-1737-0 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1737-0 Microstructure and giant magnetoresistance of FeCo-Cu nanogranular films [Elektronische Daten] [Changzheng Wang, Yiqing Zhang, Xiaoguang Xiao, Yonghua Rong, H. Tsu] A series of (Fe50Co50) x Cu1−x granular films were prepared using a magnetron controlled sputtering system. The microstructure and giant magnetoresistance (GMR) of FeCo-Cu films deposited at room temperature and then annealed at various temperatures were investigated through transmission electron microscope and conventional four probes method under room temperature, respectively. The results revealed that all FeCo-Cu films consisted of fine FeCo granules uniformly dispersed in the Cu matrix and formed fcc structure. By a non-linear least-squares method, the size distribution of FeCo granules in all as-deposited films satisfied a log-normal function. Upon varying the magnetic volume fraction (x), the GMR of as-deposited FeCo-Cu films reached a maximum of about 0.7% at the volume fraction of 31% FeCo, corresponding to the fact that the GMR has a non-monotonic relationship with the granule size. With increasing the annealing temperature, the GMR of films with lower volume fraction reached a peak at higher temperature, while for films with higher volume fraction the GMR reached a peak at lower temperature. In addition, the relationships between the full width at half maximum (FWHM) or the sensitivity of the GMR and the volume fraction were discussed in detail. Springer Science+Business Media, LLC, 2007 Wang Changzheng Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, 100084, Beijing, P.R.China aut Zhang Yiqing Department of Physics, Liaocheng University, Liaocheng city 252059, Shandong Province, P.R.China aut Xiao Xiaoguang Department of Physics, Liaocheng University, Liaocheng city 252059, Shandong Province, P.R.China aut Rong Yonghua School of Materials Science and Engineering, Shanghai Jiaotong University, 200030, Shanghai, P.R.China aut Tsu H. School of Materials Science and Engineering, Shanghai Jiaotong University, 200030, Shanghai, P.R.China aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 5903-5910 0022-2461 42:15<5903 2007 42 10853 https://doi.org/10.1007/s10853-007-1737-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1737-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Changzheng Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, 100084, Beijing, P.R.China aut NATIONALLICENCE 700 1- Zhang Yiqing Department of Physics, Liaocheng University, Liaocheng city 252059, Shandong Province, P.R.China aut NATIONALLICENCE 700 1- Xiao Xiaoguang Department of Physics, Liaocheng University, Liaocheng city 252059, Shandong Province, P.R.China aut NATIONALLICENCE 700 1- Rong Yonghua School of Materials Science and Engineering, Shanghai Jiaotong University, 200030, Shanghai, P.R.China aut NATIONALLICENCE 700 1- Tsu H. School of Materials Science and Engineering, Shanghai Jiaotong University, 200030, Shanghai, P.R.China aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 5903-5910 0022-2461 42:15<5903 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer