TAILIEUCHUNG - Swiatkowska-Warkocka et al. Nanoscale Research Letters 2011, 6:226

Swiatkowska-Warkocka et al. Nanoscale Research Letters 2011, 6:226 NANO EXPRESS Open Access Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation Zaneta Swiatkowska-Warkocka*, Kenji Kawaguchi, Hongqiang Wang, Yukiko Katou, Naoto Koshizaki Abstract Spherical iron oxide nanocomposite particles composed of magnetite and wustite have been successfully synthesized using a novel method of pulsed laser irradiation in ethyl acetate. Both the size and the composition of nanocomposite particles are controlled by laser irradiation condition. Through tuning the laser fluence, the Fe3O4/ FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated. This work presents a. | Swiatkowska-Warkocka et al. Nanoscale Research Letters 2011 6 226 http content 6 1 226 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Controlling exchange bias in Fe3Q4 FeO composite particles prepared by pulsed laser irradiation Zaneta Swiatkowska-Warkocka Kenji Kawaguchi Hongqiang Wang Yukiko Katou Naoto Koshizaki Abstract Spherical iron oxide nanocomposite particles composed of magnetite and wustite have been successfully synthesized using a novel method of pulsed laser irradiation in ethyl acetate. Both the size and the composition of nanocomposite particles are controlled by laser irradiation condition. Through tuning the laser fluence the Fe3O4 FeO phase ratio can be precisely controlled and the magnetic properties of final products can also be regulated. This work presents a successful example of the fabrication of ferro ferri FM antiferromagnetic AFM systems with high chemical stability. The results show this novel simple method as widely extendable to various FM AFM nanocomposite systems. Introduction Magnetic nanoparticles and hybrid magnetic nanostructures are of growing interest because of their technological applications in magnetic recording media sensitive magnetic sensors and various biomedical applications such as drug delivery system hyperthermia or magnetic resonance imaging 1 . In order to fulfil the requirements of many of these applications an accurate control over the coercivity is strongly required. Exchange bias coupling at the ferro ferri FM anti-ferromagnetic AFM interface has attracted considerable attention due to their applications in permanent magnet applications and high density recording media 2 3 . The exchange bias effect is manifested by the shifting and broadening of a magnetic hysteresis loop of a sample cooled under an applied field 1 4 5 . Although the intrinsic origin of exchange bias effect is not yet understood fully it is generally accepted that the interface exchange

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