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Magnetic properties of amorphous Fe93Zr7 films: Effect of light ion implantation

Journal article
Authors Atieh Zamani
Reda Moubah
Martina Ahlberg
Henry Stopfel
Unnar B Arnalds
Anders Hallén
Björgvin Hjörvarsson
Gabriella Andersson
Petra E Jönsson
Published in Journal of Applied Physics
Volume 117
Issue 14
Pages 143903
ISSN 0021-8979
Publication year 2015
Published at Department of Physics (GU)
Pages 143903
Language en
Links dx.doi.org/10.1063/1.4917212
Subject categories Condensed Matter Physics

Abstract

The Curie temperature (T c) of amorphous FeZr alloys can be greatly enhanced by doping with light elements. In this investigation, ion implantation is used to dope Fe93Zr7 thin films with H, He, B, C, and N. Extended X-ray absorption fine structure measurements confirm that the amorphous structure is preserved upon implantation for all samples, except for the N-implanted sample which is partially crystallized. The Curie temperature increases from 124 K for the pristine FeZr sample to about 400 K for the (FeZr)B0.11 sample. The increase of T c is proportional to the increase in the average Fe-Fe distance, which allows us to conclude that the dominant cause of the T c enhancement of amorphous Fe93Zr7 upon doping is a volume effect.

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