首页|Unconventional room-temperature negative magnetoresistance effect in Au/n-Ge:Sb/Au devices
Unconventional room-temperature negative magnetoresistance effect in Au/n-Ge:Sb/Au devices
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Non-magnetic semiconductor materials and their devices have attracted wide attention since they are usually prone to exhibit large positive magnetoresistance(MR)effect in a low static magnetic field environment at room temperature.However,how to obtain a large room-temperature negative MR effect in them remains to be studied.In this paper,by de-signing an Au/n-Ge:Sb/Au device with metal electrodes located on identical side,we observe an obvious room-temperature negative MR effect in a specific 50 T pulsed high magnetic field direction environment,but not in a static low magnetic field environment.Through the analysis of the experimental measurement of the Hall effect results and bipolar transport theory,we propose that this unconventional negative MR effect is mainly related to the charge accumulation on the surface of the device under the modulation of the stronger Lorentz force provided by the pulsed high magnetic field.This theoretical an-alytical model is further confirmed by regulating the geometry size of the device.Our work sheds light on the development of novel magnetic sensing,magnetic logic and other devices based on non-magnetic semiconductors operating in pulsed high magnetic field environment.
magnetoresistancegermanium-based devicespulsed high magnetic fields
何雄、杨凡黎、牛浩峪、王立峰、易立志、许云丽、刘敏、潘礼庆、夏正才
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Hubei Engineering Research Center of Weak Magnetic-field Detection,College of Science,China Three Gorges University,Yichang 443002,China
Wuhan National High Magnetic Field Center,Huazhong University of Science and Technology,Wuhan 430074,China
Special Funding for Talents of Three Gorges University国家自然科学基金国家重点研发计划
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