Complex free-space magnetic field textures induced by three-dimensional magnetic nanostructures.
Complex free-space magnetic field textures induced by three-dimensional magnetic nanostructures.
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DOI：
10.1038/s41565-021-01027-7
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发表时间：
2022-03
影响因子：
38.3
通讯作者：
Fernández-Pacheco A
中科院分区：
文献类型：
--
作者：
Donnelly C;Hierro-Rodríguez A;Abert C;Witte K;Skoric L;Sanz-Hernández D;Finizio S;Meng F;McVitie S;Raabe J;Suess D;Cowburn R;Fernández-Pacheco A
在磁系统中设计复杂的竞争效应，无论是通过引入非线性相互作用，还是三维几何图形，都是实现新功能的新兴途径。特别是，通过三维几何形状和曲率的设计，可以直接控制几何诱导和内在的结构内性质，例如各向异性和手性，从而产生许多新的物理和功能，例如三维手性自旋态，超快手性畴壁动力学和具有新自旋拓扑结构的自旋纹理。在这里，我们超越了三维结构内属性的控制，并定制相邻磁结构的静磁耦合，结构间的属性，使我们能够在磁杂散场中产生复杂的纹理。为此，我们利用直写纳米纤维技术，创造交织的纳米磁性钴双螺旋，其中曲率，扭转，手性和磁耦合联合利用。通过重建的三维矢量磁状态的双螺旋与软X射线磁层摄影，我们确定了一个规则的阵列的存在下，在相邻的螺旋高度耦合锁定畴壁对。微磁学模拟表明，磁化结构导致磁感应强度中形成一系列复杂的织构，包括磁化中的涡旋和自由空间中的反涡旋，它们共同形成了有效的B场横结壁。复杂三维磁场纳米纹理的设计和创建为智能材料、非常规计算、粒子捕获和磁成像开辟了新的可能性。在磁性双纳米螺旋中，几何效应和偶极相互作用的平衡导致了强耦合的三维自旋态。这导致了杂散场的拓扑特征，提供了一种新的途径来图案化磁感应。
The design of complex, competing effects in magnetic systems—be it via the introduction of nonlinear interactions, or the patterning of three-dimensional geometries—is an emerging route to achieve new functionalities. In particular, through the design of three-dimensional geometries and curvature, intrastructure properties such as anisotropy and chirality, both geometry-induced and intrinsic, can be directly controlled, leading to a host of new physics and functionalities, such as three-dimensional chiral spin states, ultrafast chiral domain wall dynamics and spin textures with new spin topologies. Here, we advance beyond the control of intrastructure properties in three dimensions and tailor the magnetostatic coupling of neighbouring magnetic structures, an interstructure property that allows us to generate complex textures in the magnetic stray field. For this, we harness direct write nanofabrication techniques, creating intertwined nanomagnetic cobalt double helices, where curvature, torsion, chirality and magnetic coupling are jointly exploited. By reconstructing the three-dimensional vectorial magnetic state of the double helices with soft-X-ray magnetic laminography, we identify the presence of a regular array of highly coupled locked domain wall pairs in neighbouring helices. Micromagnetic simulations reveal that the magnetization configuration leads to the formation of an array of complex textures in the magnetic induction, consisting of vortices in the magnetization and antivortices in free space, which together form an effective B field cross-tie wall. The design and creation of complex three-dimensional magnetic field nanotextures opens new possibilities for smart materials, unconventional computing, particle trapping and magnetic imaging. In magnetic double nanohelices, the balance of geometrical effects and dipolar interaction results in strongly coupled three-dimensional spin states. This leads to topological features in the stray field, offering a new route to pattern the magnetic induction.
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影响因子：
3.2
作者：
Gliga, S.;Hertel, R.;Schneider, C. M.
通讯作者：
Schneider, C. M.
影响因子：
1.8
作者：
Hertel, Riccardo
通讯作者：
Hertel, Riccardo
影响因子：
64.8
作者：
Donnelly, Claire;Guizar-Sicairos, Manuel;Heyderman, Laura J.
通讯作者：
Heyderman, Laura J.
影响因子：
8.6
作者：
Mach-Batlle, Rosa;Bason, Mark G.;Prat-Camps, Jordi
通讯作者：
Prat-Camps, Jordi
影响因子：
2
作者：
Metlov, KL
通讯作者：
Metlov, KL