Exchange-coupling behavior in nanostructured FePt/Fe bilayer films

Authors

Yi Liu, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2016

Citation

AIP ADVANCES 6, 056010 (2016)

http://dx.doi.org/10.1063/1.4943414

Comments

Copyright 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Abstract

Different thicknesses of FePt/Fe bilayer films are deposited on (001) MgO substrates by sputtering Fe and Pt targets with in-situheating at 830°C. X-ray diffraction indicates a complete alignment of the FePt [001] axis with MgO [001] axis. The nucleation field H_n is estimated from hysteresis loops measured using a SQUID magnetometer. A FePt/Fe bilayer model is proposed to calculate the nucleation field H_n and compared with the experimental data. The model can explain experimental trends and gives useful predictions for nanostructure synthesis and further experiment.