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Modification of magnetic properties of polyethyleneterephthalate by iron ion implantation

Journal article
Authors M.G. Lukashevich
X. Batlle
A. Labarta
Vladimir Popok
V.A. Zhikharev
R.I. Khaibullin
Published in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume 257
Issue 1-2
Pages 589-592
Publication year 2007
Published at Department of Physics (GU)
Pages 589-592
Language en
Links www.sciencedirect.com/science?_ob=A...
Keywords Ion implantation; Magnetic nanoparticles; Polymers
Subject categories Low energy physics, Magnetism

Abstract

Fe+ ions (40 keV) were implanted into polyethyleneterephthalate (PET) films with fluences of (0.25–1.5) × 1017 cm−2. Magnetic properties of the synthesised Fe:PET composites were studied using superconducting quantum interference device (SQUID) technique in temperature range of 2–300 K. For range of fluences (0.5–0.75) × 1017 cm−2 the samples reveal superparamagnetic behaviour at room temperature. At fluences above 0.75 × 1017 cm−2 the strong increase of magnetisation and transition to ferromagnetic properties are registered. Analysis of the magnetic hysteresis loops suggests an easy plane magnetic anisotropy similar to that found for thin magnetic films. Zero-field-cooled (ZFC) and field-cooled (FC) temperature measurements of magnetisation are found to be in agreement with earlier observed formation of Fe nanoparticles (NPs) in the implanted layers. The growth and agglomeration of the NPs forming the quasi-continuous labyrinth-like structure in the polymer film at the highest implantation fluence of 1.5 × 1017 cm−2 is an origin for the transition to the ferromagnetic properties.

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