Interfacial coupling and negative spin Hall magnetoresistance in Pt/NiO/YIG

Interfacial coupling and negative spin Hall magnetoresistance in Pt/NiO/YIG
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Pt/NiO/YIG 中的界面耦合和负自旋霍尔磁阻

DOI:
10.1063/1.5041865
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发表时间:
2018-08
影响因子:
4
通讯作者:
Wu D.
Wu D.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Luan Z. Z.;Chang F. F.;Wang P.;Zhou L. F.;Cooper J. F. K.;Kinane C. J.;Langridge S.;Cai J. W.;Du J.;Zhu T.;Wu D.

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在 Pt 和 Y3Fe5O12 (YIG) 之间插入 NiO 反铁磁层,可将 Pt/YIG 中的自旋霍尔磁阻 (SMR) 的正号更改为低温下的负号。在这里,我们使用偏振中子反射计来探索 NiO 和 YIG 之间的耦合,以了解负 SMR 的机制。在 NiO 中观察到弱的未补偿磁矩,该磁矩的方向垂直于 YIG。因此,我们推断NiO的自旋轴垂直于YIG。这一结果直接支持了这样的解释:负SMR是由NiO层反射回来的纯自旋电流以及NiO和YIG之间的自旋翻转耦合引起的。在Pt和Y3Fe5O12(YIG)之间插入NiO反铁磁层,可以将Pt/YIG中的自旋霍尔磁阻(SMR)的正号变为负号。在这里,我们使用偏振中子反射计来探索 NiO 和 YIG 之间的耦合,以了解负 SMR 的机制。在 NiO 中观察到弱的未补偿磁矩,该磁矩的方向垂直于 YIG。因此,我们推断NiO的自旋轴垂直于YIG。这一结果直接支持了负 SMR 是由 NiO 层反射回来的纯自旋电流以及 NiO 和 YIG 之间的自旋翻转耦合引起的解释。
Inserting an antiferromagnetic layer of NiO between Pt and Y3Fe5O12 (YIG) changes the positive sign of the spin Hall magnetoresistance (SMR) in Pt/YIG to a negative sign at low temperature. Here, we use polarized neutron reflectometry to explore the coupling between NiO and YIG to understand the mechanism of the negative SMR. A weak uncompensated magnetic moment is observed in the NiO and the direction of this moment is perpendicular to YIG. Therefore, we infer that the spin axis of NiO is perpendicular to YIG. This result directly supports the explanation that the negative SMR results from the pure spin current reflected back by the NiO layer and the spin-flop coupling between NiO and YIG.Inserting an antiferromagnetic layer of NiO between Pt and Y3Fe5O12 (YIG) changes the positive sign of the spin Hall magnetoresistance (SMR) in Pt/YIG to a negative sign at low temperature. Here, we use polarized neutron reflectometry to explore the coupling between NiO and YIG to understand the mechanism of the negative SMR. A weak uncompensated magnetic moment is observed in the NiO and the direction of this moment is perpendicular to YIG. Therefore, we infer that the spin axis of NiO is perpendicular to YIG. This result directly supports the explanation that the negative SMR results from the pure spin current reflected back by the NiO layer and the spin-flop coupling between NiO and YIG.
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