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Magnetricity: understanding and exploiting a new phenomenon

磁力：理解和利用新现象

基本信息

批准号：
EP/I034599/1
负责人：
Steven Bramwell
金额：
$ 51.97万
依托单位：
University College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FI034599%2F1
关键词：
Magnetricity understanding exploiting new phenomenon

项目摘要

While electric charge currents (electricity) have dominated much of the agenda of pure and applied physics for more than a century, the analogous magnetic phenomenon has never been investigated, either experimentally or theoretically. The reason is that magnetic charge currents were thought not to exist. However all this has changed after a series of recent developments that have demonstrated the existence of magnetic charges in a type of material called `spin ice'. This material contains emergent magnetic charges or monopoles that may flow to form a magnetic equivalent of electricity or magnetricity . The magnetic charges of spin ice are not elementary particles, so cannot escape the material, but they do behave like magnetic charges in a practical sense. This type of magnetic charge is common to all magnetic materials, but it is only in spin ice that it exists in the form of nearly point-like quasiparticles (monopoles) that are free to conduct magnetic current. The magnetic monopoles of spin ice are the most vivid example of an emergent excitation in condensed matter yet discovered, and have the added attractive quality that they directly couple to the magnetic field. They are thus of interest not only at the level of basic physics, but also for potential applications ( magnetronics ). Of course this is a long way off but a proof of principle would illuminate the exciting possibilities. The main aims of the project are to understand the basic physics of magnetricity with a view to controlling the magnetic current, observing charge rearrangements and, ultimately, building a device. In order to do this we will focus on understanding the basic properties of magnetic charge transport in spin ice in both its bulk form and in the form of thin films. We will also explore thermalised artificial spin ice arrays.

虽然电荷流（电）在世纪以来一直占据着纯物理和应用物理的大部分议程，但类似的磁现象从未被研究过，无论是实验还是理论。原因是磁荷电流被认为是不存在的。然而，最近的一系列发展表明，在一种称为“自旋冰”的材料中存在磁荷，这一切都发生了变化。这种物质包含涌现的磁荷或磁单极子，它们可以流动形成电或磁性的磁等价物。自旋冰的磁荷不是基本粒子，因此不能逃离材料，但它们在实际意义上确实表现得像磁荷。这种类型的磁荷是所有磁性材料所共有的，但只有在自旋冰中，它才以近似点状的准粒子（单极子）的形式存在，可以自由传导磁流。自旋冰的磁单极子是迄今为止发现的凝聚态物质中涌现激发的最生动的例子，并且具有直接耦合到磁场的额外吸引力。因此，它们不仅在基础物理学层面上，而且在潜在的应用（磁电子学）方面都很有意义。当然，这还有很长的路要走，但原理的证明将阐明令人兴奋的可能性。该项目的主要目的是了解磁性的基本物理学，以期控制磁流，观察电荷重排，并最终建造一个装置。为了做到这一点，我们将集中在理解的基本性质的自旋冰在其散装形式和薄膜形式的磁电荷输运。我们还将探索热化人工自旋冰阵列。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Crystal Shape-Dependent Magnetic Susceptibility and Curie Law Crossover in the Spin Ices Dy2Ti2O7 and Ho2Ti2O7

自旋冰 Dy2Ti2O7 和 Ho2Ti2O7 中晶体形状相关的磁化率和居里定律交叉

DOI：
10.48550/arxiv.1305.5154
发表时间：
2013
期刊：
影响因子：
0
作者：
Bovo L
通讯作者：
Bovo L

Brownian motion and quantum dynamics of magnetic monopoles in spin ice.

DOI：
10.1038/ncomms2551
发表时间：
2013
期刊：
Nature communications
影响因子：
16.6
作者：
通讯作者：

Restoration of the third law in spin ice thin films.

DOI：
10.1038/ncomms4439
发表时间：
2014-03-12
期刊：
NATURE COMMUNICATIONS
影响因子：
16.6
作者：
Bovo, L.;Moya, X.;Prabhakaran, D.;Soh, Yeong-Ah;Boothroyd, A. T.;Mathur, N. D.;Aeppli, G.;Bramwell, S. T.
通讯作者：
Bramwell, S. T.

Far-from-equilibrium monopole dynamics in spin ice