Magnetic properties of Cu1+xMn2?xO4 and Ni1+xMn2?xO4 solid solutions |
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| Affiliation: | 1. Sciences Chimiques de Rennes, UMR-CNRS 6226, Université de Rennes 1, 35042 Rennes Cedex, France;2. Materials Chemistry Department, Facultad de Química y Biología, Universidad de Santiago, Santiago, Chile;3. Departamento de Física, Universidade Estadual Paulista (UNESP), Bauru, Brazil;4. Instituto Cerámica y Vidrio, CSIC, Electroceramics Department, Campus de Cantoblanco, 28049 Madrid, Spain;1. School of Mechanical Engineering, Nantong University, Nantong 226019, China;2. Department of Mechanical Engineering, Zilang College, Nantong 226019, China;1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, China;2. School of Chemistry, Monash University, Clayton, VIC 3800, Australia;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004 PR China;2. Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, Nanning, 530004 PR China;1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, PR China;2. Department of Chemical Engineering, Tsinghua University, State Key Lab of Chemical Engineering, Beijing 100084, PR China;1. Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy;2. CEMIN, Via Elce di Sotto 8, 06123 Perugia, Italy;3. CIRIAF, Via G. Duranti 67, 06125 Perugia, Italy;4. Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Perugia, Via Pascoli, 06123 Perugia, Italy |
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| Abstract: | 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+). |
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