巨磁阻薄膜激光感生电压的温度稳定性研究
Temperature stability of laser induced thermoelectric voltage signal in colossal magneto resistance thin films
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摘要: 为了研究温度对激光感生热电电压的影响,采用脉冲激光沉积方法制备了La1-XCaXMnO(LCMO),La1-XPbXMnO(LPMO)和La1-XSrXCoO(LSCO)3种薄膜.用锁相斩波系统测量了激光感生热电电压依环境温度的变化并定义了温度系数,进行了理论分析和实验论证,取得了温度系数数据.结果表明,LSCO的温度系数最小并为正温度系数,LC-MO温度系数最大是负温度系数,LPMO温度系数为正.这一结果对激光感生电压器件的稳定性是有帮助的.Abstract: La1-XCaXMnO(LCMO),La1-XPbXMnO(LPMO) and La1-XSrXCoO(LSCO) thin films were prepared with laser pulse deposition technique in order to investigate the laser induced thermoelectric voltage signal which affected by temperature.The laser induced thermoelectric voltage signals of La1-XCaXMnO3(LCMO),La1-XPbXMnO3(LPMO) and La1-XSr-XCoO3(LSCO) thin films were measured at 290K～340K temperature range by using lock-in amplifier.The signal-temperature coefficients(STC) of three CMR thin films were defined and compared.It was found that the LSCO demonstrated positive and smallest STC,while LCMO showed largest and negative STC.
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