Investigation of magnetic droplet solitons using x-ray holography with extended references.
Investigation of magnetic droplet solitons using x-ray holography with extended references.
复制标题
使用具有扩展参考的X射线全息图研究磁液滴孤子。
DOI：
10.1038/s41598-018-29856-y
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发表时间：
2018-08-01
影响因子：
4.6
通讯作者：
Ogrin FY
中科院分区：
文献类型：
--
作者：
Burgos-Parra E;Bukin N;Sani S;Figueroa AI;Beutier G;Dupraz M;Chung S;Dürrenfeld P;Le QT;Mohseni SM;Houshang A;Cavill SA;Hicken RJ;Åkerman J;van der Laan G;Ogrin FY
耗散磁孤子或磁滴是一种结构，当非线性被色散平衡时，已经预测存在于薄磁性层内，并且驱动力抵消了自旋进动的固有阻尼。这样的孤子可以在纳米接触（NC）下形成，该纳米接触将大的自旋极化电流密度递送到具有垂直磁各向异性的磁性层中。虽然液滴的存在已被证实，从电气测量和微磁模拟，只有少数尝试已作出直接观察维持这些结构的磁景观，然后只有一组有限的实验参数值。在这项工作中，我们使用X射线全息技术HERALDO，图像的[Co/Ni]x4多层膜内的NC正交伪自旋阀的磁性结构，对于不同的磁场和注入电流范围。对于具有90 nm NC直径的设备，在-33 mA和0.3 T下成像的磁配置揭示了一种结构，该结构在基于我们的电气测量的液滴孤立子存在的电流范围内，并且与液滴的预期尺寸（直径约100 nm）及其在样品中的空间位置一致。我们还报告了磁场（0-50 mT）的存在下，在较低的直流电流下观察到的磁化配置，在那里，预计观察制度的不稳定液滴形成。
A dissipative magnetic soliton, or magnetic droplet, is a structure that has been predicted to exist within a thin magnetic layer when non-linearity is balanced by dispersion, and a driving force counteracts the inherent damping of the spin precession. Such a soliton can be formed beneath a nano-contact (NC) that delivers a large spin-polarized current density into a magnetic layer with perpendicular magnetic anisotropy. Although the existence of droplets has been confirmed from electrical measurements and by micromagnetic simulations, only a few attempts have been made to directly observe the magnetic landscape that sustains these structures, and then only for a restricted set of experimental parameter values. In this work we use and x-ray holography technique HERALDO, to image the magnetic structure of the [Co/Ni]x4 multilayer within a NC orthogonal pseudo spin-valve, for different range of magnetic fields and injected electric currents. The magnetic configuration imaged at −33 mA and 0.3 T for devices with 90 nm NC diameter reveals a structure that is within the range of current where the droplet soliton exist based on our electrical measurements and have it is consistent with the expected size of the droplet (∼100 nm diameter) and its spatial position within the sample. We also report the magnetisation configurations observed at lower DC currents in the presence of fields (0–50 mT), where it is expected to observe regimes of the unstable droplet formation.
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影响因子：
16.6
作者：
Bonetti S;Kukreja R;Chen Z;Macià F;Hernàndez JM;Eklund A;Backes D;Frisch J;Katine J;Malm G;Urazhdin S;Kent AD;Stöhr J;Ohldag H;Dürr HA
通讯作者：
Dürr HA
影响因子：
3.8
作者：
Duckworth, Thomas A.;Ogrin, Feodor;van der Laan, Gerrit
通讯作者：
van der Laan, Gerrit
影响因子：
2.7
作者：
Slobodianiuk, D. V.;Prokopenko, O. V.;Melkov, G. A.
通讯作者：
Melkov, G. A.
影响因子：
2.8
作者：
Mohseni, S. M.;Sani, S. R.;Akerman, Johan
通讯作者：
Akerman, Johan
影响因子：
3.7
作者：
Hoefer, M. A.;Silva, T. J.;Keller, Mark W.
通讯作者：
Keller, Mark W.