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Wiley, physica status solidi (a) – applications and materials science, 10(208), p. 2348-2351, 2011

DOI: 10.1002/pssa.201084176

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Growth evolution and superparamagnetism of ultrathin Fe films grown on GaN(0001) surfaces

Journal article published in 2011 by Ping Kwan Johnny Wong ORCID, Wen Zhang ORCID, Xugao Cui, Iain Will, Yongbing Xu, Zikuo Tao, Xi Li, Zili Xie, Rong Zhang
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We have investigated the growth and magnetic properties of Fe films on wurtzite GaN(0001) in the ultrathin regime at room temperature (RT). As found from the coverage-dependent reflection high-energy electron diffraction patterns, the Fe film growth proceeds in the three-dimensional Volmer–Weber (VM) mode at RT. Coexistence of ferromagnetic (FM) and superparamagnetic (SPM) phases has been observed at a Fe thickness of about 5 ML. The zero-field-cooling (ZFC) and field-cooling (FC) magnetization measurements under a constant magnetic field with various temperatures have suggested a Fe blocking temperature (TB) of 120 K.