A novel magnetoresistance induced by charge ordering in ferromagnetic/charge-ordered/ferromagnetic trilayers. (9th November 2015)

• Record Type: Journal Article
• Authors: Wang, Haiou; Li, Jinwei; Su, Kunpeng; Huo, Dexuan; Tan, Weishi
• Is Part Of: Europhysics letters. Volume 112:Number 2(2015:Oct.)
• Publication Date: 2015-11-09
• Subjects: 75.47.Gk -- 75.60.Ej -- 75.70.Cn; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/112/27007
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: Microstructure, magnetoresistance (MR) and magnetic properties of Pr0.7 Sr0.3 MnO3 /La0.5 Ca0.5 MnO3 /Pr0.7 Sr0.3 MnO3 trilayers, which are shown to be tunable with different La0.5 Ca0.5 MnO3 spacer thickness, are investigated. The trilayer with 6 nm thick La0.5 Ca0.5 MnO3 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 La0.5 Ca0.5 MnO3 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 La0.5 Ca0.5 MnO3 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 La0.5 Ca0.5 MnO3 spacer), which can be applied in the used devices.