Magnetic and dielectric studies of multiferroic CuO nanoparticles confined to porous glass

• Published in: Journal of magnetism and magnetic materials Vol. 324; no. 18; pp. 2921 - 2925
• Main Authors: Charnaya, E.V., Lee, M.K., Tien, C., Pak, V.N., Formus, D.V., Pirozerskii, A.L., Nedbai, A.I., Ubyivovk, E.V., Baryshnikov, S.V., Chang, L.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2012
• Subjects: Bifurcations; COMPOSITES; COPPER OXIDE; CuO-porous glass nanocomposite; CUPRIC OXIDE; Dc magnetization; Electric permittivity; Glass; GLASSES; INSULATION (ELECTRICAL); MAGNETIC PROPERTIES; Magnetization; Magnetization curves; MICROSTRUCTURES; Multiferroic; Nanocomposites; Nanomaterials; Nanostructure; PARTICLES; PHASE TRANSFORMATIONS; Phase transitions; POROSITY; Size effects; Dc magnetization; Size effects; Electric permittivity; Phase transitions; CuO-porous glass nanocomposite; Multiferroic
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2012.04.046

Dc magnetization and ac electric permittivity were measured for the CuO-porous glass nanocomposite made and for pressed powder CuO. Magnetization curves showed a bend between two linear segments for both the nanocomposite and bulk cupric oxide at 230K evidencing that the temperature of the transition from the paramagnetic into multiferroic phase did not change noticeably under nanoconfinement. Results suggested also a reduction of the temperature of the second transition into the collinear antiferromagnetic phase. ZFC and FC magnetizations were found to bifurcate for the nanocomposite and bulk CuO. The bifurcation was accompanied with peaks on ZFC magnetization. ► CuO nanoparticles embedded into porous glass compared to bulk. ► ZFC and FC magnetizations bifurcate in the nanocomposite and bulk CuO. ► Dc magnetization suggests a reduction of the temperature TN1 till about 190K. ► Temperature TN2 of the transition into multiferroic phase did not change.