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Spin-orbit driven ferromagnetic resonance

Fang, D; Kurebayashi, H; Wunderlich, J; Vyborny, K; Zarbo, LP; Campion, RP; Casiraghi, A; ... Ferguson, AJ; + view all (2011) Spin-orbit driven ferromagnetic resonance. Nature Nanotechnology , 6 (7) pp. 413-417. 10.1038/nnano.2011.68. Green open access

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Abstract

Ferromagnetic resonance is the most widely used technique for characterizing ferromagnetic materials. However, its use is generally restricted to wafer-scale samples or specific micro-magnetic devices, such as spin valves, which have a spatially varying magnetization profile and where ferromagnetic resonance can be induced by an alternating current owing to angular momentum transfer. Here we introduce a form of ferromagnetic resonance in which an electric current oscillating at microwave frequencies is used to create an effective magnetic field in the magnetic material being probed, which makes it possible to characterize individual nanoscale samples with uniform magnetization profiles. The technique takes advantage of the microscopic non-collinearity of individual electron spins arising from spin–orbit coupling and bulk or structural inversion asymmetry in the band structure of the sample. We characterize lithographically patterned (Ga,Mn)As and (Ga,Mn)(As,P) nanoscale bars, including broadband measurements of resonant damping as a function of frequency, and measurements of anisotropy as a function of bar width and strain. In addition, vector magnetometry on the driving fields reveals contributions with the symmetry of both the Dresselhaus and Rashba spin–orbit interactions.

Type: Article
Title: Spin-orbit driven ferromagnetic resonance
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/nnano.2011.68
Publisher version: http://dx.doi.org/10.1038/nnano.2011.68
Language: English
Additional information: Copyright © 2011 Macmillan Publishers Limited. All rights reserved.
Keywords: Nanometrology, Spintronics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1410875
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