磁铁矿电阻开关中的磁滞现象是由焦耳热引起的
The origin of hysteresis in resistive switching in magnetite is Joule heating
摘要：
在许多过渡金属氧化物中，观察到电阻经历由大偏压引起的剧烈变化。在磁铁矿中，Fe $_3$ O $_4$，低于Verwey温度，最近发现一个电场驱动的过渡到一个较低的电阻状态，具有滞后的电流-电压响应。本文报道了外延磁铁矿薄膜的脉冲电导测量结果。我们发现，虽然高到低电阻的转变是由电场驱动的，在$I-V$曲线中观察到的滞后的结果从焦耳加热在低电阻状态。磁滞回线的形状取决于脉冲参数，并减少到一个无电流的“跳跃”提供的热弛豫是快速的电压脉冲之间的时间相比。提出了一个简单的弛豫时间热模型，捕捉的滞后机制的要点。
英文摘要：
In many transition metal oxides the electrical resistance is observed to undergo dramatic changes induced by large biases. In magnetite, Fe$_3$O$_4$, below the Verwey temperature, an electric field driven transition to a state of lower resistance was recently found, with hysteretic current-voltage response. We report the results of pulsed electrical conduction measurements in epitaxial magnetite thin films. We show that while the high- to low-resistance transition is driven by electric field, the hysteresis observed in $I-V$ curves results from Joule heating in the low resistance state. The shape of the hysteresis loop depends on pulse parameters, and reduces to a hysteresis-free "jump" of the current provided thermal relaxation is rapid compared to the time between voltage pulses. A simple relaxation time thermal model is proposed that captures the essentials of the hysteresis mechanism.
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