Direct dynamic imaging of non-adiabatic spin torque effects

S.D. Pollard, L. Huang, K.S. Buchanan, D.A. Arena and Y. Zhu ()
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S.D. Pollard: Brookhaven National Laboratory
L. Huang: Brookhaven National Laboratory
K.S. Buchanan: Colorado State University
D.A. Arena: National Synchrotron Source, Brookhaven National Laboratory
Y. Zhu: Brookhaven National Laboratory

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Spin-transfer torques offer great promise for the development of spin-based devices. The effects of spin-transfer torques are typically analysed in terms of adiabatic and non-adiabatic contributions. Currently, a comprehensive interpretation of the non-adiabatic term remains elusive, with suggestions that it may arise from universal effects related to dissipation processes in spin dynamics, while other studies indicate a strong influence from the symmetry of magnetization gradients. Here we show that enhanced magnetic imaging under dynamic excitation can be used to differentiate between non-adiabatic spin-torque and extraneous influences. We combine Lorentz microscopy with gigahertz excitations to map the orbit of a magnetic vortex core with

Date: 2012
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DOI: 10.1038/ncomms2025

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