纳米磁体的热电操纵
Thermoelectrical manipulation of nano-magnets
摘要：
我们提出了一种设备，可以作为磁阻开关或振荡器。该装置是基于一个自旋热电子控制的交换耦合的两个强铁磁体通过弱铁磁间隔。我们表明，由于磁点接触或纳米柱中的高浓度电流引起的局部焦耳加热可用于可逆地驱动弱铁磁体通过其居里点，从而交换解耦具有反平行基态的强铁磁层。这样的自旋电子平行到反平行切换引起磁阻振荡，其中频率可以通过从基本上DC到GHz的适当偏置来控制。
英文摘要：
We propose a device that can operate as a magneto-resistive switch or oscillator. The device is based on a spin-thermo-electronic control of the exchange coupling of two strong ferromagnets through a weakly ferromagnetic spacer. We show that the local Joule heating due to a high concentration of current in a magnetic point contact or a nanopillar can be used to reversibly drive the weak ferromagnet through its Curie point and thereby exchange-decouple the strongly ferromagnetic layers, which have an antiparallel ground state. Such a spin-thermionic parallel-to-antiparallel switching causes magnetoresistance oscillations where the frequency can be controlled by proper biasing from essentially DC to GHz.
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