FACW_PHAS_2009_10897550_Gao_Hong_Ni_Wang_Tang_He.pdf (721.49 kB)
Uniaxial anisotropy and novel magnetic behaviors of CoFe2O4 nanoparticlesprepared in a magnetic field
journal contribution
posted on 2021-11-15, 21:35 authored by Qian Gao, Guangyan Hong, Jiazuan Ni, Wendong Wang, Jinke Tang, Jibao HeCoFe2O4 nanoparticles prepared by chemical coprecipitation method in a magnetic field exhibit novel magnetic properties. The average particle diameter was about 2 nm and larger depending on the post annealing temperature. Magnetization measurements indicate that smaller nanoparticles are superparamagnetic above their respective blocking temperatures. In the blocked state, these nanoparticles exhibit interesting behaviors in the magnetic hysteresis measurements. Constricted, or wasp waisted with extremely narrow waist, hysteresis curves have been observed in the magnetization versus field sweeps. For larger nanoparticles, the room temperature hysteresis is typical of a ferromagnet with an open loop, but the loop closes at lower temperature. The novel magnetic behavior is attributed to the directional order of Co ions and vacancies in CoFe2O4 established during the coprecipitation of the nanoparticles under an applied field.
History
ISO
engLanguage
EnglishPublisher
University of Wyoming. LibrariesJournal title
JOURNAL OF APPLIED PHYSICSCollection
Faculty Publications - Physics and AstronomyDepartment
- Library Sciences - LIBS