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

✍ Scribed by Wong, Ping Kwan Johnny ;Zhang, Wen ;Cui, Xugao ;Will, Iain ;Xu, Yongbing ;Tao, Zikuo ;Li, Xi ;Xie, Zili ;Zhang, Rong

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
210 KB
Volume
208
Category
Article
ISSN
0031-8965

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✦ Synopsis

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 (T~B~) of 120 K.

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