摘要
采用离子束溅射方法在玻璃基片上制备了一系列的CoSiO2 颗粒膜样品,并对样品的巨磁电阻效应进行了研究.在Co35(SiO2)65( 体积百分比) 颗粒膜样品中,观测到室温下近4 % 的巨磁电阻效应.研究了不同基片温度对巨磁电阻效应的影响并发现,随着基片温度的升高样品的巨磁电阻效应下降.根据样品的电阻率温度关系曲线分析,在铁磁金属非磁绝缘介质颗粒膜中,除了电子自旋相关隧穿效应外。
The heterogeneous Co\- x (SiO\-2) 1-x thin granular films have been fabricated on glass substrates by the ion\|beam co\|sputtering technique at different temperatures.The films with 200?nm thickness consist of granules (cobalt) embedded in nonmagnetic matrix (SiO\-2).A giant magnetoresistance (GMR) ratio of about 4% at room temperature has been observed for x =35% (volume fraction).The GMR ratio of samples decreased while increasing the substrate temperature ( T s).By studying the V\|I curve and ρ T curve of the Co 35 (SiO\-2) 65 sample,we conclude that besides the spin\|dependant tunneling,there may exist another mechanism resulting in the GMR effect of the ferromagnet\|insulator nano\|granular film,which needs further study.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期128-131,共4页
Acta Physica Sinica
基金
国家自然科学基金
纳米材料科学攀登项目
江苏省自然科学基金