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Finite-size Kosterlitz-Thouless transition in 2DXY Fe/W(001) ultrathin films by Atchison, J.; Bhullar, A.; Norman, B.; Venus, D. is a scholarly article available to read on EtoBox.

What is Finite-size Kosterlitz-Thouless transition in 2DXY Fe/W(001) ultrathin films about?

Magnetic susceptibility measurements of 3-4 ML Fe/W(001) ferromagnetic films demonstrate that this is a 2DXY system in which a finite-size Kosterlitz-Thouless (KT) transition occurs. The films are grown in ultrahigh vacuum and their magnetic response is measured using the magneto-optic Kerr effect (MOKE). The analysis of many independently grown films shows that the paramagnetic tail of the susceptibility is described by $\chi(T) \sim \exp \bigr{(}B/(T/T_{KT}-1)^a\bigl{)}$, where $a=0.50\pm0.03$ and $B=3.48\pm0.16$, in quantitative agreement with KT theory. Below the finite-size transition temperature $T_C(L)$, the behavior is complicated by dissipation (likely related to the re-emergence of fourfold anisotropy and magnetic domains). A subset of measurements with very small dissipation most closely represents the idealized system treated by theory. In these, the temperature interval between the fitted Kosterlitz-Thouless transition temperature and the finite-size transition temperature is $T_C(L)/T_{KT} -1=0.065\pm0.016$. This yeids an estimate of the finite size $L$ affecting the film of order micrometers. This gives experimental support to the idea that even a mesoscopic limitati

Author

Atchison, J.; Bhullar, A.; Norman, B.; Venus, D.

Published

2018

Language

EN