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HomeMaterials Science ForumMaterials Science Forum Vol. 971Room-Temperature Ferromagnetism in Mn-Doped CuCrO2...

Room-Temperature Ferromagnetism in Mn-Doped CuCrO₂ Nanopowders

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Abstract:

(Cu_1-_xMn_x)CrO₂ (0≤ x ≤6 at%) and Cu (Cr_1-_yMn_y)O₂ (0≤ y ≤6 at%) nanopowders were prepared by combining solid-state reaction and ball milling. The Mn concentration dependences of microstructure, morphology and magnetic properties were investigated. It is found that all the samples have a pure 3R-CuCrO₂ delafossite structure. The lattice expansion supports the Mn entrance into the Cu and Cr sublattices, respectively, in (Cu_1-_xMn_x)CrO₂ and Cu (Cr_1-_yMn_y)O₂, which is further proved by X-ray photoelectron spectroscopy to some degree. A-site Mn substitution brings about paramagnetic behavior. However, room-temperature ferromagnetism is achieved in B-site Mn-doped samples, originating from the hole-mediated Cr³⁺–Mn³⁺ double-exchange interaction. The saturation magnetization of this CuMO₂ delafossite (M=Cr, Mn) is about an order of magnitude higher than literature values, and gradually decreased with the Mn addition due to the combined influence of the number of the M–M pairs, the M–M distances and the hole density.

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Periodical:

Materials Science Forum (Volume 971)

Pages:

91-100

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.971.91

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Online since:

September 2019

Authors:

Jing Jing Ji, Fang Ting Lin*, Xiao Yong He, Hui Shi

Keywords:

Diluted Magnetic Semiconductors, Magnetic Properties, Microstructure, Nanoparticles

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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