Fe-SiO<sub>2</sub>颗粒膜的磁性和隧道磁电阻效应

Fe-SiO₂颗粒膜的磁性和隧道磁电阻效应

基金项目:

国家自然科学基金资助项目(59971023)

详细信息

1. Applied Magnetism Key Laboratory of State Education Ministry, Lanzhou Universi ty, Lanzhou 730000, China

摘要: 采用射频共溅射方法制备了不同金属体积分数f_υ的Fe-SiO₂颗粒膜，利用X射线衍射、透射电镜、Mǒssbauer效应和振动样品磁强计详细研究了薄膜的结构、磁性及磁电阻效应。结果表明：f_υ为0.33时，得到磁电阻最大值-3.3%。Fe_0.33(SiO₂)_0.67样品在室温下表现出超顺磁性，对该样品的变温Mǒssbauer谱研究表明：颗粒的尺寸分布满足对数正态分布。探讨了TMP与Fe的依赖关系。
- 隧道磁电阻 ;
- 颗粒膜 ;
- Mǒssbauer效应
Abstract: Fe-SiO₂ granular films with various fraction of metal volume f_υ were prepared by rf co-sputtering method.X-ray diffraction,transmission electron m icroscopy,Mǒssbauer spectroscopy,vibrating sample magnetometer and resistivity measurements were used to investigate the structure,magnetic properties and tunn eling magnetoresistance （TMR）.It was found that the TMR reached a maximum of 3.3% at f_υ =0.33 and the film appeared superparamagnetism at room temperature.The results of Mǒssbauer spectra recorded at various temperatures indicated that th e size distribution of granule followed the lognormal distribution.The metal Fe composition dependent of TMR in Fe-SiO₂ films was also discussed.
- tunneling magneto-resistance /
- granular films /
- Mǒssbauer spectroscopy