Magnetoresistance retraction behaviour of Ag/p-Ge:Ga/Ag device under pulsed high magnetic field  

作　　者：Xiong He Zhengcai Xia Haoyu Niu Zhuo Zeng 

机构地区：[1]Wuhan National High Magnetic Field Center,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Materials Science & Technology》2022年第19期1-6,共6页材料科学技术（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (Nos. 11674115 and 51861135104);National Key R&D Program of China (No. 2016YFA0401003)

摘　　要：In non-magnetic semiconductor materials,unsaturated magnetoresistance(MR)effect has attracted lots of attention due to its physical interests and potential applications in electronic devices.Under the ex-tremely high magnetic field,the stability and reliability of MR effects based on the non-ohmic transport has been rarely researched.In this paper,the transport properties of non-magnetic Ag/p-Ge:Ga/Ag devices under 45 T pulsed high magnetic field at 300 K are investigated.It is found that in ohmic conduction re-gion(I<5 mA)where the single dominant carrier is hole,the MR values increase with increasing the applied magnetic field,presenting a conventional unsaturated behavior.In the two non-ohmic regions(5 mA≤I≤100 mA)where the transport is dominated by bipolar(electrons and holes),a MR retraction has been obviously observed under pulsed high magnetic field.Combining the Hall measurement results and calculation of Hall effect with bipolar-driven transport model,the mechanism of the MR retraction is analysed,in which the MR retraction may be related to the strong regulation of electron-to-hole den-sity ratio by pulsed high magnetic field.This work provides a reference for evaluating the stability and reliability of the properties of non-magnetic semiconductor based MR devices under the interference of strong magnetic pulses.

关 键 词：Germanium-based device MAGNETORESISTANCE Bipolar transport Retraction behavior Pulsed high magnetic field 

分 类 号：TN303[电子电信—物理电子学] O469[理学—凝聚态物理]