Open AccessA STUDY ON THE MAGNETIC PROPERTIES OF THE LITHIUM FERRITE NANOCRYSTALLITES
Author(s) -
Hua Yang,
Muyu Zhao,
Han De-Hua,
Jianping Wang,
Hongzhi Luo
Publication year - 1996
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.45.291
Subject(s) - superparamagnetism , materials science , curie temperature , magnetism , magnetization , ferrite (magnet) , condensed matter physics , saturation (graph theory) , analytical chemistry (journal) , nuclear magnetic resonance , ferromagnetism , magnetic field , chemistry , composite material , physics , mathematics , chromatography , quantum mechanics , combinatorics
The magnetic properties of lithium ferrite nanocrystallites ranging from 9.1 to 860 nm have been studied. The specific saturation magnetization σs of these nanocrystallites decrease lineally with the nanocrystallite size.The specific magnetization versus temperature curves (T) and M?ssbauer spectra of sample A (diameter D = 860 nm), sample B (D = 11.8 nm) and sample C (D = 9.1 nm) have been measured. It is found that the Curie temperatures of samples B and C are 50℃ lower than that of sample A. From the σ(T) curve of sample C, it seems that sample C consists of two magnetic phases. These phenomena have been discussed with the superparamagnetism and the surface magnetism of sample C.