The structure and magnetic properties of NiO with different sizes

Author

Yi, J.J.B. ; Ding, J. ; Thongmee, S. ; Feng, Y.P. ; Chow, G.M.

Author_Institution

Dept. of Mater. Sci. & Eng., Nat. Univ. of Singapore, Singapore

fYear

2008

fDate

24-27 March 2008

Firstpage

1047

Lastpage

1050

Abstract

NiO was prepared by co-precipitation followed by an annealing. The fabricated powers showed cluster structures when the annealing temperature was 170degC and the powders showed a dominant ferromagnetic coupling with a magnetization of 105 emu/g. When the annealing temperature was higher than 170degC, the powders showed a nanocrystalline structure composed of surface spins and antiferromagnetic core. Exchange bias was observed after field cooling in these powders. Spin glass and superparamagnetism behaviors were found in the cluster NiO and nanocrystalline NiO, respectively.

Keywords

annealing; magnetisation; nanostructured materials; precipitation; spin glasses; superparamagnetism; NiO; annealing; antiferromagnetic core; cluster structures; co-precipitation; exchange bias; ferromagnetic coupling; magnetic properties; magnetization; nanocrystalline structure; spin glass; superparamagnetism; temperature 170 degC; Annealing; Antiferromagnetic materials; Cooling; Couplings; Magnetic cores; Magnetic properties; Magnetization; Nanostructures; Powders; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanoelectronics Conference, 2008. INEC 2008. 2nd IEEE International

Conference_Location

Shanghai

Print_ISBN

978-1-4244-1572-4

Electronic_ISBN

978-1-4244-1573-1

Type

conf

DOI

10.1109/INEC.2008.4585663

Filename

4585663