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arXiv 2302.09505cond-mat.mtrl-sci
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Pt/Y3Fe5O12异质结中自旋电流电控制的滞后和训练效应

Hysteresis and training effect in the electric control of spin current in Pt/Y3Fe5O12 heterostructures

Y. D. Sun, Lei Wang, Lili Lang, Ke Xia, S. M. Zhou

摘要:

我们已经报道了在离子液体栅电压Vg的后续周期中Pt/Y3 Fe 5 O 12异质结构中的自旋电流的滞后和训练效应。自旋抽运中的逆自旋霍尔效应电压和自旋霍尔磁电阻在Vg的前半周期表现出类似二极管的行为,在Vg的前半周期也表现出类似于二极管的行为。由于训练效应,在Vg的第二个周期中,二极管状行为和滞后都变得很弱甚至消失。上述实验结果可以用屏蔽电荷掺杂模型很好地解释,该模型中的电荷和局域磁矩在Pt层中是不对称分布的。各向异性磁电阻和铁磁共振的测量结果进一步证实了该模型的适用性。这种类似二极管的行为归因于Pt层中不对称分布的局部磁矩和自旋电流弛豫之间的相互作用。滞后和训练效应源于Pt原子的氧化和还原之间的不完全可逆过程以及离子液体/Pt界面在电动门控下表面形貌的演变。这项工作提供了新的见解,以改善电控自旋电流器件的功能性能。

英文摘要:

We have reported on the hysteresis and training effect of spin current in Pt/Y3Fe5O12 heterostructures during subsequent cycles of ionic liquid gate voltage Vg. The inverse spin Hall effect voltage in spin pumping and spin Hall magnetoresistance exhibit diode-like behaviors in the first half cycle of Vg andalsoshowhysteresisinthe first cycle of Vg. Both the diode-like behavior and the hysteresis become weak and even vanish in the second cycle of Vg due to the training effect. The above experimental results can be well explained by the screening charge doping model, in which the charge and the local magnetic moment are asymmetrically distributed in the Pt layer. The applicability of this model is further confirmed by measurements of anisotropic magnetoresistance and ferromagnetic resonance. The diode-like behavior is attributed to interplay between the asymmetrically distributed local magnetic moment and the spin current relaxation in the Pt layer. The hysteresis and the training effect arise from the incompletely reversible process between oxidation and reduction of Pt atoms and the evolution of the surface morphology at the ionic liquid/Pt interface under electric gating. This work provides new insights to improve the functional performance of electrically controlled spin current devices.

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