Modification of magnetic properties of polyethyleneterephthalate by iron ion implantation

Magnetoresistive Effect in PET Films with Iron Nanoparticles Synthesized by Ion Implantation

“…1 T for both directions of the scanning magnetic field. Our previous study showed that the sample implanted with fluence of 0.75×10 17 cm -2 had a coercive force of about 30 mT at 4 K [11]. This value is different from the above-mentioned 70-80 mT.…”

“…The magnetotransport measurements of this sample at higher temperatures showed rapid increase in scattering of experimental points, and the relative change in magnetoresistance cannot be measured when the blocking temperature is reached, i.e. when the Fe NPs experience transition from the ferromagnetic to the superparamagnetic state [11]. Fig.…”

“…(1c). The analysis of the electron diffraction patterns showed that there were α-phase metallic Fe with the traces of non-magnetic iron oxides (mainly, and following saturation [10,11]. A so-called percolation transition in electrical and magnetic properties was suggested due to the formation of quasi-continuous granular iron layer in which close-located but non-overlapping Fe NPs or grains are situated in the heavily carbonized polymer.…”

“…In our earlier publications [10,11] we showed the results on the study of magnetic resonance phenomena and static magnetic properties of Fe-implanted PET. In this paper, we present the data of temperature dependence of conductance and magnetoresistive measurements and discuss magnetotransport properties of the composite Fe-PET layers.…”

“…On the one hand, the mechanisms of charge carrier transport can evolve from variable range hopping (VRH) or intercluster tunnelling for moderate metal concentration towards percolation conductance under the conditions of IMT [8]. On the other hand, an increase in the concentration of magnetic impurity in a nonmagnetic dielectric matrix leads to magnetic percolation transition from the diamagnetic to *Address correspondence to this author at the University of Gothenburg, 42196 Gothenburg, Sweden; Tel: +46 31 7723435; Fax: +46 31 7723496; E-mail: popok@physics.gu.se ferromagnetic state through the superparamagnetism of magnetic NPs [9][10][11]. Moreover, granular condensed media with magnetic ordering can demonstrate a wide spectrum of different magnetic micro-or nano-structures.…”