A novel magnetoresistance induced by charge ordering in ferromagnetic/charge-ordered/ferromagnetic trilayers

A novel magnetoresistance induced by charge ordering in ferromagnetic/charge-ordered/ferromagnetic trilayers
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铁磁/电荷有序/铁磁三层中电荷排序引起的新型磁阻

DOI:
10.1209/0295-5075/112/27007
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发表时间:
2015-10
期刊:
Epl
影响因子:
1.8
通讯作者:
Tan Weishi
Tan Weishi
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Wang Haiou;Li Jinwei;Su Kunpeng;Huo Dexuan;Tan Weishi

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研究了Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3三层膜的微结构、磁电阻(MR)和磁性能,这些三层膜可以通过不同的La0.5Ca0.5MnO3间隔层厚度来调节。在195 K和220 K温度下,以6 nm厚的La0.5Ca0.5MnO3为间隔层,通过双交换机制实现了三层结构。与此相反,三层较厚的La0.5Ca0.5MnO3间隔增强MR在一个很宽的低温范围内。在50 K,1 T条件下,以18 nm厚的La 0.5Ca 0.5MnO 3为间隔层的三层磁性纳米结构的磁性能上级其它磁性纳米结构。我们推测,这种磁共振起源于铁磁/反铁磁竞争,伴随着电荷有序反铁磁态的形成和电荷有序态在外加磁场下的崩溃,而不是双交换机制.通过控制应变状态(La_(0.5)Ca_(0.5)MnO_3间隔层的厚度)可以实现大的可调谐MR,这可以应用于所使用的器件中。
Microstructure, magnetoresistance (MR) and magnetic properties of Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3 trilayers, which are shown to be tunable with different La0.5Ca0.5MnO3 spacer thickness, are investigated. The trilayer with 6 nm thick La0.5Ca0.5MnO3 spacer show at 195 K in 1 T and at 220 K in 9 T, which is realized through the double-exchange mechanism. In contrast, trilayers with the thicker La0.5Ca0.5MnO3 spacer show enhanced MR at a wide low-temperature range. The obtained at 50 K in 1 T in the trilayer with 18 nm thick La0.5Ca0.5MnO3 spacer is superior to that of other magnetic nanoscales. We surmise that this MR originates in the ferromagnetic/antiferromagnetic competition accompanied with the formation of a charge-ordered antiferromagnetic state and the collapse of the charge-ordered state at the applied magnetic field, rather than in the double-exchange mechanism. Large and tunable MR can be realized by controlling the strain state (the thickness of the La0.5Ca0.5MnO3 spacer), which can be applied in the used devices.
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