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Variable magnetism of cobalt-fullerene mixed system


International Conference on Metal, Mining and Magnetic Materials

November 01-02 , 2018 Paris , France

Vasily Lavrentiev, Alexandr Stupakov and Michail Motylenko

Nuclear Physics Institute-CAS, Czech Republic Institute of Physics-CAS, Czech Republic Institute of Material Science-Technische Universiatat Bergakademie Freiberg, Germany

Keynote: J Mat. Sci

DOI: 10.4172/2321-6212-C7-031

Abstract

Great activity in spintronics-related fields in recent few years revealed importance in combining magnetic metal nanoparticles and organic semiconductor that promises new nanomaterials with attractive magnetic and electronic properties. Here, we demonstrate the remarkable nanocomposites, formed through selfassembling in the cobalt-fullerene mixture, which exhibit tunable magnetism. The CoxC60 films (x<120) were fabricated by simultaneous deposition of Co and C60 onto the same substrate under controlled conditions. We found that magnetic properties of the films strongly depends on the Co concentration x. The CoxC60 films with x<2 demonstrate a ferromagnetic behaviour. At higher x (x>2), the films become superparamagnetic. Such a magnetic transformation correlates with the changes in the film nanostructure. In the interval of x<2, the film nanostructure consists of the bulk fcc-C60 and Co2C60 phases only. At higher x (x>2), the Co clustering occurs, and the film is a nanocomposite (NC) as the arrays of small Co clusters (few nm in size) distributed in the C60-based matrix. Parameters of the NC (size and fraction of the Co clusters) designate the features of the superparamagnetic effect (coercive field, saturation magnetization, blocking temperature Tb). Remarkable changes in the film magnetism occur upon the air exposure of the CoxC60 films. In particular, magnetization of such films revealed vertical shift of the hysteresis loops suggesting the effect of interface exchange magnetism. In the interval of x>30, the oxygen content in such films is dropped down as well as Tb is increasing that reflects coalescence of the Co clusters. The CoxC60 films with x>40 show ferromagnetic behaviour at room temperature that allowed us to detect their magnetic domains using magnetic force microscopy. The discovered magnetism of the CoxC60 films designates their potential for application in high-dense magnetic memory, sensors and catalysis

Biography

Vasily Lavrentiev has completed his PhD in 1984 from Leningrad Polytechnic Institute (St. Petersburg, Russia). He received Postdoctoral experience in Institute of Applied Physics (Sumy) and Institute of Physics at Augsburg University (Augsburg). His activity in nanoscience has been started from 2000 in Japan Atomic Energy Research Institute (Takasaki). Presently, he is a Researcher of Nuclear Physics Institute CAS. He has published more than 140 papers in reputed journals.

E-mail: [email protected]

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