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

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+).

Bibliographic Details

Main Authors:	Peña, O., Cailleaux, X., Piriou, Bruno, del Canto, M., Abarca, Valentina, Ríos, E., Ortiz, J., Gautier, J.L., Lisboa-Filho, P.N., Moure, C.
Format:	article biblioteca
Language:	eng
Subjects:	000 - Autres thèmes,
Online Access:	http://agritrop.cirad.fr/577907/ http://agritrop.cirad.fr/577907/1/Spinel.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!