Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices
Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices
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DOI：
10.1103/physrevb.95.024415
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发表时间：
2017-01-13
影响因子：
3.7
通讯作者：
Fullerton, E. E.
中科院分区：
文献类型：
--
作者：
Montoya, S. A.;Couture, S.;Fullerton, E. E.
由拓扑保护的自旋结构（如skyrmions）产生的有趣的物理和潜在的存储技术促使人们努力发现可以承载这些磁性结构的新材料系统。本文利用非晶态Fe/Gd多层膜的高可调磁性来探索偶极子稳定的skyrons和skyrons晶格的磁性，这些晶格是由偶极场和交换能量的竞争形成的。使用真实空间成像和互反空间散射技术，我们确定了材料特性和形成天幕的磁场范围。微磁模型与我们对小型skyrmions特征（类似于50至70 nm）的观察结果非常吻合，并表明这些类型的skyrmions具有丰富的区域结构，在薄膜中心呈布洛赫状，而在每个表面呈尼尔状。我们的研究结果为在不同温度和磁场下设计薄膜几何结构中偶极子相的形成和可控性提供了一条途径。
The interesting physics and potential memory technologies resulting from topologically protected spin textures such as skyrmions have prompted efforts to discover new material systems that can host these kinds of magnetic structures. Here, we use the highly tunable magnetic properties of amorphous Fe/Gd multilayer films to explore the magnetic properties that lead to dipole-stabilized skyrmions and skyrmion lattices that form from the competition of dipolar field and exchange energy. Using both real space imaging and reciprocal space scattering techniques, we determined the range of material properties and magnetic fields where skyrmions form. Micromagnetic modeling closely matches our observation of small skyrmion features (similar to 50 to 70 nm) and suggests that these classes of skyrmions have a rich domain structure that is Bloch-like in the center of the film and more Neel-like towards each surface. Our results provide a pathway to engineer the formation and controllability of dipole skyrmion phases in a thin film geometry at different temperatures and magnetic fields.