Spherical magnetic nanoparticles fabricated by laser target evaporation / Safronov A. P.,Beketov I. V.,Komogortsev S. V.,Kurlyandskaya G. V.,Medvedev A. I.,Leiman D. V.,Larranaga A.,Bhagat S. M. // AIP ADVANCES. - 2013. - V. 3, l. 5.

ISSN/EISSN:

2158-3226 / нет данных

Type:

Article

Abstract:

Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Author keywords:

IRON-OXIDE NANOPOWDERS; CO2-LASER EVAPORATION; FE3O4 NANOPARTICLES; FINITE-SIZE; TEMPERATURE; FERROMAGNETS; FERROFLUIDS; DEPENDENCE; EXPLOSION; PARTICLES

DOI:

10.1063/1.4808368

Web of Science ID:

ISI:000320673600035

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Publisher	AMER INST PHYSICS
Address	CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Language	English
Article-Number	052135
Keywords-Plus	IRON-OXIDE NANOPOWDERS; CO2-LASER EVAPORATION; FE3O4 NANOPARTICLES; FINITE-SIZE; TEMPERATURE; FERROMAGNETS; FERROFLUIDS; DEPENDENCE; EXPLOSION; PARTICLES
Research-Areas	Science \& Technology - Other Topics; Materials Science; Physics
Web-of-Science-Categories	Nanoscience \& Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
Author-Email	galina@we.lc.ehu.es
ResearcherID-Numbers	Beketov, Igor/I-3538-2014 SGIKER, Cienciometria/A-5759-2012 Komogortsev, Sergey/A-4707-2013
ORCID-Numbers	Kurlyandskaya, Galina/0000-0002-3712-1637
Funding-Acknowledgement	RFBR {[}10-02-96015, 12-02-31385]; UrFU {[}215]; Spanish MEC {[}MAT2011-27573-C04]; Universidad del Pais Vasco UPV/EHU {[}UFI11/53]; Physics Department of the University of Maryland
Funding-Text	This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support.
Number-of-Cited-References	47
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	30
Journal-ISO	AIP Adv.
Doc-Delivery-Number	167ZH