Time-resolved x-ray microscopy of spin-torque-induced magnetic vortex gyration

被引：115

作者：

Bolte, Markus ^{[1
,2
]}

Meier, Guido ^{[1
,2
]}

Krueger, Benjamin ^{[4
]}

Drews, Andre ^{[1
,2
]}

Eiselt, Rene ^{[1
,2
]}

Bocklage, Lars ^{[1
,2
]}

Bohlens, Stellan ^{[4
]}

Tyliszczak, Tolek ^{[3
]}

Vansteenkiste, Arne ^{[5
]}

Van Waeyenberge, Bartel ^{[5
,6
]}

Chou, Kang Wei ^{[6
]}

Puzic, Aleksandar ^{[6
]}

Stoll, Hermann ^{[6
]}

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany

[2] Univ Hamburg, Zentrum Mikrostrukturforsch, D-20355 Hamburg, Germany

[3] LBNL, Adv Light Source, Berkeley, CA 94720 USA

[4] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany

[5] Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[6] Max Planck Inst Metallforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.100.176601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Time-resolved x-ray microscopy is used to image the influence of alternating high-density currents on the magnetization dynamics of ferromagnetic vortices. Spin-torque-induced vortex gyration is observed in micrometer-sized permalloy squares. The phases of the gyration in structures with different chirality are compared to an analytical model and micromagnetic simulations, considering both alternating spin-polarized currents and the current's Oersted field. In our case the driving force due to spin-transfer torque is about 70% of the total excitation while the remainder originates from the current's Oersted field. This finding has implications to magnetic storage devices using spin-torque driven magnetization switching and domain-wall motion.

引用

页数：4

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