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通过调节偶极相互作用改变管状纳米结构的磁构型。

Change in the magnetic configurations of tubular nanostructures by tuning dipolar interactions.

作者信息

Salinas H D, Restrepo J, Iglesias Òscar

机构信息

Grupo de Magnetismo y Simulación G+, Instituto de Física, Universidad de Antioquia. A.A., 1226, Medellín, Colombia.

Departament de Física de la Matèria Condensada and Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Av., Diagonal 647, 08028, Barcelona, Spain.

出版信息

Sci Rep. 2018 Jul 6;8(1):10275. doi: 10.1038/s41598-018-28598-1.

DOI:10.1038/s41598-018-28598-1
PMID:29980728
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6035215/
Abstract

We have investigated the equilibrium states of ferromagnetic single wall nanotubes by means of atomistic Monte Carlo simulations of a zig-zag lattice of Heisenberg spins on the surface of a cylinder. The main focus of our study is to determine how the competition between short-range exchange (J) and long-range dipolar (D) interactions influences the low temperature magnetic order of the nanotubes as well as the thermal-driven transitions involved. Apart from the uniform and vortex states occurring for dominant J or D, we find that helical states become stable for a range of intermediate values of γ = D/J that depends on the radius and length of the nanotube. Introducing a vorticity order parameter to better characterize helical and vortex states, we find the pseudo-critical temperatures for the transitions between these states and we establish the magnetic phase diagrams of their stability regions as a function of the nanotube aspect ratio. Comparison of the energy of the states obtained by simulation with those of simpler theoretical structures that interpolate continuously between them, reveals a high degree of metastability of the helical structures that might be relevant for their reversal modes.

摘要

我们通过对圆柱表面海森堡自旋的锯齿形晶格进行原子蒙特卡罗模拟，研究了铁磁单壁纳米管的平衡态。我们研究的主要重点是确定短程交换（J）和长程偶极（D）相互作用之间的竞争如何影响纳米管的低温磁序以及所涉及的热驱动转变。除了在主导J或D时出现的均匀态和涡旋态之外，我们发现对于一系列取决于纳米管半径和长度的γ = D/J中间值，螺旋态变得稳定。引入一个涡度序参量以更好地表征螺旋态和涡旋态，我们找到了这些态之间转变的伪临界温度，并建立了它们稳定区域的磁相图作为纳米管纵横比的函数。将模拟得到的态的能量与在它们之间连续插值的更简单理论结构的能量进行比较，揭示了螺旋结构具有高度的亚稳性，这可能与其反转模式有关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/30aa7a6459b8/41598_2018_28598_Fig13_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/c080766fad78/41598_2018_28598_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/1272e4141c11/41598_2018_28598_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/cda05a6f15ca/41598_2018_28598_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/50712f1bbe4a/41598_2018_28598_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/8e947a467988/41598_2018_28598_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/30aa7a6459b8/41598_2018_28598_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/a9f17ac937d1/41598_2018_28598_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/9db1a2a957c8/41598_2018_28598_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/ce6814eebb79/41598_2018_28598_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/12545ec8e577/41598_2018_28598_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/be4f34e73574/41598_2018_28598_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/6fd30338b056/41598_2018_28598_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/9a253ef8b8db/41598_2018_28598_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/c080766fad78/41598_2018_28598_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/1272e4141c11/41598_2018_28598_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/cda05a6f15ca/41598_2018_28598_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/50712f1bbe4a/41598_2018_28598_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/8e947a467988/41598_2018_28598_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3062/6035215/30aa7a6459b8/41598_2018_28598_Fig13_HTML.jpg

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