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arXiv 1508.01367cond-mat.mes-hallcond-mat.str-el
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旋磁薄膜:表面重构、表面自旋波和磁化

Helimagnetic thin films: surface reconstruction, surface spin-waves and magnetization

Sahbi El Hog, H. T. Diep

摘要:

用格林函数方法研究了简单立方晶格螺旋磁薄膜的量子特性。我们发现薄膜中的自旋组态是强烈不均匀的。利用精确确定的自旋组态,我们计算了自旋波谱和层磁化强度随温度T的变化。我们发现存在的表面局域模式,强烈影响表面磁化。我们还表明,量子涨落引起有趣的自旋收缩在T = 0,并在低T层磁化之间产生交叉。

英文摘要:

Quantum properties of a helimagnetic thin film of simple cubic lattice with Heisenberg spin model are studied using the Green's function method. We find that the spin configuration across the film is strongly non uniform. Using the exactly determined spin configuration we calculate the spin-wave spectrum and the layer magnetizations as functions of temperature T. We show the existence of surface-localized modes which strongly affect the surface magnetization. We also show that quantum fluctuations cause interesting spin contractions at T = 0 and give rise to a cross-over between layer magnetizations at low T .

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