|Exchange bias in La(0.7S)r(0.3)MnO(3)/NiO and LaMnO3/NiO interfaces|
|X. K. Ning; Z. J. Wang; X. G. Zhao; C. W. Shih; Z. D. Zhang
|Source Publication||Journal of Applied Physics
|Abstract||Bilayers of La0.7Sr0.3MnO3/NiO and LaMnO3/NiO were prepared and magnetic exchange coupling investigated in these bilayers, where the Curie temperature of the ferromagnetic (FM) layer is lower than the Neel temperature of the antiferromagnetic layer. After small-field cooling, the LSMO/NiO bilayer exhibits an exchange bias with field H-EB = 60 Oe, whereas the LMO/NiO sample shows weak magnetic interaction (similar to 22 Oe). The unconventional exchange bias in LSMO/NiO bilayer vanishes as temperature rises above 50 K. The weak magnetic interaction at the LMO/NiO interface is due to a larger Hubbard parameter value and smaller transfer integral value in the Mott insulator LMO compared with that for the FM conductor LSMO. The valence states of Mn and Ni ions across the interfaces for LSMO/NiO and LMO/NiO have been studied using X-ray photoelectron spectroscopy. We speculate that the FM interaction between Ni2+ and Mn4+ gives rise to magnetic regions that pin the ferromagnetic LSMO layer. (C) 2013 AIP Publishing LLC.|
|description.department||[ning, x. k.
; wang, z. j.
; zhao, x. g.
; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [zhao, x. g.
; shih, c. w.] natl chung cheng univ, dept phys, chiayi 62102, taiwan.
; wang, zj (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.
X. K. Ning,Z. J. Wang,X. G. Zhao,et al. Exchange bias in La(0.7S)r(0.3)MnO(3)/NiO and LaMnO3/NiO interfaces[J]. Journal of Applied Physics,2013,113(22).
X. K. Ning,Z. J. Wang,X. G. Zhao,C. W. Shih,&Z. D. Zhang.(2013).Exchange bias in La(0.7S)r(0.3)MnO(3)/NiO and LaMnO3/NiO interfaces.Journal of Applied Physics,113(22).
X. K. Ning,et al."Exchange bias in La(0.7S)r(0.3)MnO(3)/NiO and LaMnO3/NiO interfaces".Journal of Applied Physics 113.22(2013).
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