Temperature dependence of magnetic properties of ultrathin Fe thin films on GaAs substrates

The magnetic properties of epitaxial Fe films on GaAs(001) in the initial stage have been investigated by means of XMCD and SQUID. Fe with a layer of thickness of 5 ML shows a magnetic property above RT. It is also found that the ferromagnetism character is still existed above the TB (the temperatur...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-05, Vol.747, p.250-254
Main Authors: Li, N.N., Qiu, M.X., Wang, N.
Format: Article
Language:English
Subjects:
Fe/GaAs
Ferromagnetism
Iron
Magnetic properties
Magnetism
Quenching
Relaxation time
Substrates
Superconducting quantum interference devices
Temperature dependence
Thickness
Thin films
Ultrathin films
XMCD
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Summary:The magnetic properties of epitaxial Fe films on GaAs(001) in the initial stage have been investigated by means of XMCD and SQUID. Fe with a layer of thickness of 5 ML shows a magnetic property above RT. It is also found that the ferromagnetism character is still existed above the TB (the temperature giving relaxation time comparable to the measurement time is defined as the blocking temperature) but vanishing at RT. The conclusion is that a weaker exchange interaction in the Fe thin films on GaAs (001) and the intrinsically magnetically dead layers at the interface has been excluded. The superparamagnetic character coexists with ferromagnetism above the TB at the initial growth stage. [Display omitted] •Ultrathin Fe films were deposited on GaAs(001) using MBE.•The magnetic properties of Fe/GaAs were studied using XMCD and SQUID.•The new mechanism was proposed for Fe/GaAs(001) in the initial stage.•The new mechanism was proposed for ultrathin Fe films on GaAs(001) in the initial stage through XMCD and SQUID.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.03.057