Magnetic and extraordinary Hall effect studies on Co-Pd alloy thin films

• Main Authors: Guo-heng Sun, 孫國衡
• Other Authors: Hai-Pang Chiang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/72880475785666323282

碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 96 === Co-Pd alloy thin films were fabricated by the thermal evaporation method and their extraordinary Hall effect (EHE) were investigated. From the relation between Hall resistivity ρH and magnetic field H, skew scattering and side-jump scattering is considered to be dominant. With decreasing film thickness tf, field sensitivity of Hall voltage was found to increase, which originates from the Fuchs- Sondheimer theory of the size effect. Film thickness reduction in the Co-Pd alloy thin films is found to cause both an increase in Hall voltage and a decrease in saturation fields, which means an enhancement of field sensitivity SH as Hall sensors. In this thesis,we investigated magnetic and Hall electrical characteristics of a series of Co100-XPdX (for X=45,55,65,75,85) thin films with different thickness tf varied form 50 to 1000 A. We examined the components of the films by SEM-EDX. The crystalline structure was analyzed by XRD. The saturation magnetization was analyzed by VSM. Then we measured the variation of the resistance of the films by the Hall effect masure system and analyzed the EHE of the films. Moreover, the surface morphology of each film was examined by AFM and thickness-resistance relations of the films were analyzed with the roughness -thickness curves.