Mode-coupling mechanisms in nanocontact spin-torque oscillators

Iacocca, Ezio; Dürrenfeld, Philipp; Heinonen, Olle; Åkerman, Johan; Dumas, Randy K.

doi:10.1103/PhysRevB.91.104405

Title: Mode-coupling mechanisms in nanocontact spin-torque oscillators

Journal Article · Wed Mar 11 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.104405· OSTI ID:1357006

Iacocca, Ezio ^[1]; Dürrenfeld, Philipp ^[2]; Heinonen, Olle ^[3]; Åkerman, Johan ^[4]; Dumas, Randy K. ^[1]

Univ.of Gothenburg (Sweden). Physics Dept. ; NanOsc AB, Kista (Sweden)
Univ.of Gothenburg (Sweden). Physics Dept.
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern-Argonne Inst. for Science and Engineering, Evanston, IL (United States)
Univ.of Gothenburg (Sweden). Physics Dept. ; NanOsc AB, Kista (Sweden); Royal Inst. of Technology, Kista (Sweden). School of ICT

Spin torque oscillators (STOs) are devices that allow for the excitation of a variety of magneto-dynamical modes at the nanoscale. Depending on both external conditions and intrinsic magnetic properties, STOs can exhibit regimes of mode-hopping and even mode coexistence. Whereas mode hopping has been extensively studied in STOs patterned as nanopillars, coexistence has been only recently observed for localized modes in nanocontact STOs (NC-STOs) where the current is confined to flow through a NC fabricated on an extended pseudo spin valve. We investigate the physical origin of the mode coupling mechanisms favoring coexistence, by means of electrical characterization and a multi-mode STO theory. Two coupling mechanisms are identified: (i) magnon mediated scattering and (ii) inter-mode interactions. These mechanisms can be physically disentangled by fabricating devices where the NCs have an elliptical cross-section. Furthermore, the generation power and linewidth from such devices are found to be in good qualitative agreement with the theoretical predictions, as well as provide evidence of the dominant mode coupling mechanisms.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); European Commission (EC); Swedish Foundation for Strategic Research (SSF); Swedish Research Council (SRC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1357006

Alternate ID(s):: OSTI ID: 1180992

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 10; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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