(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004；
2. 中國科學(xué)院 金屬研究所，沈陽 110016)
摘 要: 在磁場下電沉積制備CuCo功能膜材料，研究膜層的巨磁電阻效應(yīng)及磁性能。應(yīng)用X射線衍射儀(XRD)對鍍層微觀結(jié)構(gòu)隨熱處理溫度的變化進行分析，采用四引線法及振動樣品磁強計(VSM)測量膜層的磁性能。磁阻測試發(fā)現(xiàn)：磁感應(yīng)強度為0.6 T下制備的CuCo顆粒膜經(jīng)500 ℃真空退火處理1 h后，其巨磁電阻值較無磁場下制備的提高約25%，這是由于0.6 T下制備的顆粒膜晶粒較致密，同時磁場減少了膜層內(nèi)部缺陷，如雜質(zhì)、夾雜等。樣品磁滯回線表明：500 ℃真空退火處理1 h后膜層具有最佳的磁性能，此時膜層中的單磁疇磁性粒子有助于提高巨磁電阻值。CuCo顆粒膜電沉積制備過程中施加磁場可以改善膜層的微觀結(jié)構(gòu)，使其具有更高的巨磁電阻效應(yīng)。
關(guān)鍵字: CuCo顆粒膜；巨磁電阻效應(yīng)；磁場；電沉積
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract: CuCo granular films were prepared by electrodeposition in the stable magnetic field. The giant magnetoresistance and magnetic property of the films were studied. The composition and structure of the plating films were studied by XRD. The giant magnetoresistance of the films was measured by the four line method. Vibration sample magnetometer was used to measure the magnetic properties. The giant magnetoresistance results show that the magnetoresistance of CuCo granular films prepared at 0.6 T after annealing at 500 ℃ for 1 h increases by 25% than that prepared without magnetic field after vacuum annealing. The reasons are that the crystal grains of films prepared at 0.6 T are more compact, and the defects in the film such as impurity and inclusion are reduced by the magnetic field. The hysteresis loops indicate that the granular film presents the optimal magnetism after annealing at 500 ℃ for 1 h. The single magnetic domain of particle in the film is contributed to promote the giant magnetoresistance. When the CuCo granular films are electrodeposited in the stable magnetic field, the microstructure of CuCo granular films is improved and the better giant magnetoresistance effect is obtained.
Key words: CuCo granular films; giant magnetoresistance effect; magnetic field; electrodeposition
