We study the tunneling magneto thermopower and tunneling magneto thermocurrent of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ). The devices show a clear change of the thermoelectric properties upon reversal of the magnetisation of the CoFeB layers from parallel to the antiparallel orientation. When switching from parallel to antiparallel the thermopower increases by up to 55% where as the thermocurrent drops by 45%. These observations can be well explained by the Onsager relations taking into account the tunneling magneto resistance of the MTJ. These findings contrast previous studies on AlO based MTJ systems, revealing tunneling magneto thermo power but no tunneling magneto thermocurrent.

翻译：我们研究了CoFeB/MgO/CoFeB磁隧道连接点的地磁热能和地磁热流。这些装置显示,在CoFeB层磁化从平行转向抗平行方向时,热电特性发生了明显变化。当热电从平行转向抗平行时,热电能增加高达55%,当热流下降45%时,热电能则增加高达55%。这些观测可以很好地用Onsager关系来解释,其中考虑到MTJ的地磁阻力。这些观测结果与以前对基于ALO的MTJ系统的研究形成对比,揭示了地热电磁的隧道,但没有发现磁流的隧道。