Publication: Magnetic properties of Cu1+xMn2-xO4 and Ni1+xMn2-xO4 solid solutions
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Date
2007-01-01
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Coadvisor
Graduate program
Undergraduate course
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Publisher
Elsevier B.V.
Type
Article
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Acesso restrito
Abstract
Magnetic properties of two spinel oxides solid solutions, Cul+xMn2-xO4 and Ni1+xMn2-xO4 are reported. These series are characterized by two magnetic transitions: the upper one, of ferrimagnetic type, occurs at about 85 K (for copper-based) and at 105-110 K (for nickel-based spinels), independently of the x-content: the lower transition may be related to a Neel-type collinear ordering and takes place at 30 and 45 K, respectively. Application of moderate fields (H > 250 Oe) make both transitions to merge into one broad maximum in the magnetization, which takes place at lower temperature when applying larger fields. Magnetization cycles with temperature (ZFC/FC) or field (loops) allowed us to well characterize the ordered state. The effective moment follows the expected behavior when manganese ions are being substituted by ions of lower magnetic moment (Ni(2+)andCU(2+)). (c) 2007 Elsevier Ltd. All rights reserved.
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Language
English
Citation
Journal of the European Ceramic Society. Oxford: Elsevier B.V., v. 27, n. 13-15, p. 3911-3914, 2007.
