The extrinsic hysteresis behavior of dilute binary ferrofluids
. We report on the magnetization behavior of dilute binary ferrofluids based on - Fe 2 O 3 /Ni 2 O 3 composite nanoparticles (A particles), with diameter about 11nm, and ferrihydrite ( Fe 5 O 7 (OH) · 4H 2 O nanoparticles (B particles), with diameter about 6 nm. The results show that for the binary...
Saved in:
Published in | The European physical journal. E, Soft matter and biological physics Vol. 37; no. 10; p. 102 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.10.2014
EDP Sciences |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | .
We report on the magnetization behavior of dilute binary ferrofluids based on
- Fe
2
O
3
/Ni
2
O
3
composite nanoparticles (A particles), with diameter about 11nm, and ferrihydrite ( Fe
5
O
7
(OH)
·
4H
2
O nanoparticles (B particles), with diameter about 6 nm. The results show that for the binary ferrofluids with A-particle volume fraction
= 0.2 % and B-particle volume fractions
= 0.1 % and
= 0.6 %, the magnetization curves exhibit quasi-magnetic hysteresis behavior. The demagnetizing curves coincide with the magnetizing curves at high fields. However, for single
- Fe
2
O
3
/Ni
2
O
3
ferrofluids with
= 0.2 % and binary ferrofluids with
= 0.2 % and
= 1.0 %, the magnetization curves do not behave in this way. Additionally, at high field (750 kA/m), the binary ferrofluid with
= 1.0 % has the smallest magnetization. From the model-of-chain theory, the extrinsic hysteresis behavior of these samples is attributed to the field-induced effects of pre-existing A particle chains, which involve both Brownian rotation of the chains’ moments and a Néel rotation of the particles’ moments in the chains. The loss of magnetization for the ferrofluids with
= 1.0 % is attributed to pre-existing ring-like A-particle aggregates. These magnetization behaviors of the dilute binary ferrofluids not only depend on features of the strongly magnetic A-particle system, but also modifications of the weaker magnetic B-particle system.
Graphical abstract |
---|---|
Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1292-8941 1292-895X |
DOI: | 10.1140/epje/i2014-14102-6 |