Magnetic properties of Cu1+xMn2-xO4 and Ni1+xMn2-xO4 solid solutions

• Published in: Journal of the European Ceramic Society Vol. 27; no. 13-15; pp. 3911 - 3914
• Main Authors: PEFIA, O, CAILLEAUX, X, PIRIOU, B, DEL CANTO, M, ABARCA, S, RIOS, E, ORTIZ, J, GAUTIER, J. L, LISBOA-FILHO, P. N, MOURE, C
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Oxford Elsevier 01-01-2007
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Chemical Sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrotechnical and electronic ceramics; Exact sciences and technology; Ferrimagnetics; Magnetic properties and materials; or physical chemistry; Physics; Studies of specific magnetic materials; Technical ceramics; Theoretical and; Magnetization; Copper Manganese Oxides Mixed; Manganese Nickel Oxides Mixed; Soft magnets; Experimental study; Soft magnetic materials; Solid solution; Oxide ceramics; Manganese oxides; Ferrimagnetism; Spinels; Copper oxide; Nickel oxide; Electroceramics; Magnetic properties
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2007.02.058

Magnetic properties of two spinel oxides solid solutions, Cu1+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 Néel-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 (Ni2+ and Cu2+).