间隔层居里点附近CoFe/NiCu/CoFe自旋阀中的交换耦合和磁电阻
Exchange coupling and magnetoresistance in CoFe/NiCu/CoFe spin-valves near the Curie point of the spacer
摘要：
研究了两个强铁磁层之间通过弱铁磁Ni-Cu隔离层交换耦合的热控制及其相关的磁电阻效应。具有稍高于室温的居里点的间隔物可以通过改变外部温度或使用焦耳加热在其顺磁和铁磁状态之间循环。结果表明，巨磁电阻消失是由于在~ 30%Ni浓度以上的间隔中的平均自由程的强烈减少-在铁磁性开始之前。最后，提出并证明了一种装置，它结合了热控制的交换耦合和大磁阻分离的开关和读出元件。
英文摘要：
Thermal control of exchange coupling between two strongly ferromagnetic layers through a weakly ferromagnetic Ni-Cu spacer and the associated magnetoresistance is investigated. The spacer, having a Curie point slightly above room temperature, can be cycled between its paramagnetic and ferromagnetic states by varying the temperature externally or using joule heating. It is shown that the giant magnetoresistance vanishes due to a strong reduction of the mean free path in the spacer at above ~30 % Ni concentration -- before the onset of ferromagnetism. Finally, a device is proposed and demonstrated which combines thermally controlled exchange coupling and large magnetoresistance by separating the switching and the read out elements.
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