Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts

被引：5

作者：

Devolder, T. ^{[1
,2
]}

Kim, Joo-Von ^{[1
,2
]}

Petit-Watelot, S. ^{[1
,2
]}

Otxoa, R. ^{[1
,2
]}

Chappert, C. ^{[1
,2
]}

Manfrini, M. ^{[3
,4
]}

Van Roy, W. ^{[3
]}

Lagae, L. ^{[3
,4
]}

机构：

[1] CNRS, Inst Elect Fondamentale, UMR 8622, F-91405 Orsay, France

[2] Univ Paris 11, UMR 8622, F-91405 Orsay, France

[3] IMEC, B-3001 Louvain, Belgium

[4] Katholieke Univ Leuven, Lab Vaste Stoffys Magnetisme, B-3001 Heverlee, Belgium

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2011年 / 47卷 / 06期

关键词：

Magnetic microwave devices; magnetoresistive devices;

D O I：

10.1109/TMAG.2010.2101056

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We study the starting up phase of a current-controlled oscillator based on a magnetic vortex orbiting around a nanocontact in a spin-valve. From the idle state, current pulses down to a few nanoseconds can create the vortex, which is detected through the electrical signature of its steady-state gyration. Two ns are needed to reach the in-current equilibrium. The process can then be described by an Arrhenius law, with an activation energy that is consistent with the Oersted-field-induced separation of a vortex-antivortex pair. Requirements for deterministic nucleation are deduced, with prospects for instant-on oscillator capability.

引用

页码：1595 / 1598

页数：4

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