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M91快速霍尔测量仪—在更短的时间内进行更好的测量
2022-07-01 18:41:00 【Shyh_】
Lake Shore 获得专利的全新 FastHall 技术消除了反转磁场的需要,在不降低测量质量的情况下显着缩短了测量时间。事实上,较短的测量窗口会减少样品参数因自热或环境温度变化而漂移的机会。
单向场还消除了由于场对准误差导致的潜在测量偏差来源,进一步提高了结果的质量。
使用 FastHall,可以使用任何类型的磁铁。对于具有高场超导磁体的研究平台,消除场反转尤其有益。
低流动性材料的理想选择
对于具有较高迁移率的简单材料,传统的直流场霍尔效应测量相对简单且可靠。随着载体迁移率的降低,测量难度增加,准确度降低。在有前途的新型半导体材料(如光伏、热电和有机材料)中经常出现这种情况。
使用先进的锁定放大器和更长的测量窗口的交流场技术可以提取更小的霍尔电压信号,目前通常用于探索低迁移率材料。延长的测量间隔还会增加热漂移效应造成的误差,并且需要更长的时间才能获得结果——有时需要数小时。
FastHall 技术消除了这两个问题—— 它甚至可以在几秒钟内精确测量流动性极低的材料。
直流场霍尔效应过程需要在磁场设置在一个方向的情况下进行电压测量,然后反转场极性并重复电压测量。使用的磁铁类型和获得满意数据所需的测量样本数量会影响整个测量时间。
HMS技术比较
FastHall 测量需要 Van der Pauw 样本配置(使用 DC 场测量的霍尔棒配置)
M91 目前不支持交流场测量——请联系 Lake Shore 了解更多信息
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